title

author

output

README - My Tikz Favorite Things

Alfonso R. Reyes

html_document

css	keep_md	toc	number_sections
style.css	true	true	false

NEWS

Output files like .png and .pdf are now being stored in ./out
The README.Rmd document now allows to customize variables for the folders
The Hugo website through the _build_site.R script also allow some customization
The source folder with TikZ files are now only saved in src. Only tex files
The template file template.Rmd includes now special identifiers so it can be updated with user custom settings that child.Rmd uses to retrieve all graphics and code for each of the examples
The Makefile has been optimized to avoid code repetition
All data files for the TikZ examples now live under src/data

Introduction

This is a repository of the best TikZ examples I have found around the web and from papers, slides, tutorials, and books. Most of the examples are simple enough to encourage anyone to start learning TikZ. By having the result (graphic) on a web page, and be able to click on it to see the code, it rapidly helps to make the connection between code and output. I find this idea fantastic.

TikZ is ideal for any kind of publications either websites, blogs, papers, articles, slides, or books because they are portable and reproducible. TikZ files are text not binaries. They don't require mouse and clicks but writing code to connect objects and elements. These object can be very simple or as sophisticated as you want. TikZ graphics can be built under any LaTex environment for any operating system: Windows, Linux or Mac OS.

There are hundreds of libraries for TikZ in all scientific fields. That makes it easier to build advanced graphics for practically any domain or discipline because you are able to start from code already written.

Motivation

While working with Latex and TikZ file I had this question:

How can I use the power of R to organize TikZ related files?

R is very friendly to Latex and TikZ through the packages knitr and rmarkdown.

TikZ involves a source file, which carries the tex extension; the PDF that is generated by your Latex compiler and editor (I use TexStudio); the graphics output file -that could be anything imaginable. I use png files.

How this README is built

This README is smartly generated with TikZ graphics and code located in the src folder. This means that as you are adding, building, designing new TikZ drawings, they become available to be automatically included in this README file. It uses some knitr tricks. But the whole thing is awesome.

The magic is provided by:

the file template.Rmd
the chunks of code that you can see in this README

Deployment of website in GitHub Pages (GHP)

This is a very interesting article about publshing your TikZ site: Simple deployment to GH Pages. I chose to publish it in /docs instead of the public folder because it is much easier to deploy. GHP does not allow to publish a website on a folder named public, unfortunately.

Thanks. Original repository and idea

I found this valuable resource while exploring TikZ and R: https://github.com/walmes/Tikz

It is pretty neat and relatively simple to use and personalize because it uses Hugo, a generator of static websites; the same engine that is used by blogdown, bookdown, and others.

Thanks to Walmes Zeviani for the great idea of combining Latex, TikZ, R and Hugo.

Source: https://github.com/walmes/Tikz Web: http://leg.ufpr.br/~walmes/Tikz/

Summary

This is my collection of favorite TikZ graphics. It is necessary to store and organize them as gallery because it makes it easier to peek at the code for new designs.

Some useful tutorials:

Useful statistics

There are 257 total Tikz figures saved as .tex files in this gallery. The figures are sorted by filename.
There are 257 files under src/ to be compiled with pdflatex
There are 1 files under src/ to be compiled with lualatex
There are 19 data files under the folder src/data that are being used by the TikZ scripts
There are 2 Latex classes, styles and library files under the src/texmf folder

TikZ graphics and code

3d-3_cylinders_shaded.tex

\documentclass[tikz,border=5]{standalone}

\usetikzlibrary{fadings}
\tikzfading[name=fade out,
inner color=transparent!0, outer color=transparent!100]

\def\factor{4}
\def\xradius{2}
\def\yradius{2/\factor}
\def\height{1.05cm}
\def\xandy{2 and 2/\factor}

\tikzset{
  pics/.cd, %
  disc/.style ={
    code = {
      %% the foundation
      \path [fill=black!15] (-\xradius,0) -- (-\xradius,-\height) arc
      (180:360:\xandy) -- (\xradius,0) arc (0:180:\xandy);%
      \path [top color=black!25, bottom color=white, opacity=0.2] (0,0) ellipse
      [x radius=\xradius, y radius =\yradius];%
      \path [left color=black!25, right color=black!15] (-\xradius,0) --
      (-\xradius,-\height) arc (180:240:\xandy) -- +(0,\height) arc
      (240:180:\xandy);%
      \path [left color=black!15, right color=black!30] (\xradius,0) --
      (\xradius,-\height) arc (360:320:\xandy) -- +(0,\height) arc
      (320:360:\xandy);

      %% rays in front
      \foreach \col/\r/\shift/\stop/\opacity in {%
        black/205/25/20/100, %
        black/295/35/30/100, %
        black/295/30/30/200, %
        black/295/25/20/300, %
        white/245/14/14/100, %
        white/245/12/12/20, %
        white/245/10/10/10} {%
        \foreach \i [evaluate={\opposite=\r-180;}] in {0,1,...,\stop}{%
          \fill [\col, fill opacity = 1/\opacity] (\opposite:0.1 and
          0.1/\factor) -- (\r+\shift-\i:\xandy) -- ++(0,-\height) arc
          (\r+\shift-\i:\r-\shift+\i:\xandy) -- +(0,\height) -- cycle; }}

      %% rays in back
      \foreach \r/\shift/\stop/\opacity in {%
        25/25/20/100, %
        115/35/3/150,%
        115/30/23/100} {%
        \foreach \i [evaluate={\opposite=\r-180;}] in {0,1,...,\stop}{%
          \fill [black, fill opacity = 1/\opacity] (\opposite:0.1 and 0.1/\factor) --
          (\r+\shift-\i:\xandy) arc (\r+\shift-\i:\r-\shift+\i:\xandy) --
          cycle; }}

      %% masking the four edges in the center
      \foreach \i in {0.1, 0.2, ..., 0.4}%
      \fill[black!15, opacity=0.7, path fading=fade out] 
      (0,0) ellipse[x radius=\i, y radius =\i/\factor];

      %% the light and the dark arcs
      \foreach \i [evaluate={\start=185+10*\i; \finish=355-10*\i;}]%
      in {0.1, 0.2, ..., 1.5}{%
        \draw[white, opacity=0.04, line width=\i, yshift=0.02cm]
        (\start:\xandy) arc (\start:\finish:\xandy);

        \draw[black!80, opacity=0.05, line width=\i, yshift=-\height]
        (\start:\xandy) arc (\start:\finish:\xandy); }
    }
  },% 
  disc bottom/.style = {
    code = {
      \foreach \i/\opacity in {%
        1/20,2/20,3/20,4/30,5/35,6/40,7/60,8/80,9/100,10/100,11/100,12/100}%
        \fill [black, fill opacity = 1/\opacity, yshift=-0.03cm] (0,-\height)
        ellipse [x radius = \xradius+\i/40, y radius = \yradius+\i/20/\factor]; 
      \path pic {disc};
    }
  },%
  disc top/.style = {
    code = {
      \foreach \i/\opacity in {%
        2/60, 3/55, 4/50,5/40, 6/35, 7/30, 8/20, 9/20, 10/20, 11/20, 12/20,
        13/20, 14/20, 15/20, 16/20, 17/20, 18/20, 19/20, 20/20, 21/20, 22/20,
        23/20, 24/20, 25/20, 26/20}%
        \fill [black, fill opacity = 1/\opacity, yshift=-0.35cm] (0,-\height)
        ellipse [x radius = \xradius-\i/40, y radius = \yradius-\i/20/\factor];
      \path pic {disc};
    }
  }
}

\begin{document}
\begin{tikzpicture}
  \path (0,0) pic {disc bottom} (0,1.4) pic {disc top} (0,2.8) pic {disc top};
\end{tikzpicture}
\end{document}

3d-cone_intersection+3d+pgf.lualatex.tex

% http://pgfplots.net/media/tikz/examples/TEX/intersection-surfaces.tex
% +3d+pgf
% compile with lualatex
%
\documentclass[border=10pt]{standalone}
%%%<
\usepackage{verbatim}
%%%>
\usepackage{pgfplots}
\pgfplotsset{width=7cm,compat=1.8}

\begin{comment}
:Title: Intersection of two surfaces
:Tags: 3D;Intersections
:Author: Jake
:Slug: intersection-surfaces

We would like to intersect a 3D plot with a plane. The problem is not to get
the two functions into a plot, but to get the two functions to visual
intersect with each other, i.e the nearest surface is in the foreground.

This can't be done automatically, unfortunately, since pgfplots can't do z
buffering between different \addplot commands.

For this concrete application, you could construct the plot "by hand", however:

First, you draw the part of the cone below 0, then you draw the plane and the
circle, then you draw the part of the cone above 0.

I've used a polar coordinate system for this, since it makes the input of
polar functions easier.

This code was written by Jake on TeX.SE.
\end{comment}

\begin{document}
  \begin{tikzpicture}
    \begin{axis}[grid=major,view={20}{40},z buffer=sort, data cs=polar]
      \addplot3 [surf, domain=0:360, domain y=5:10,samples=30, samples y=10]
      {-y+5};
      \addplot3 [data cs=cart,surf,domain=-10:10,samples=2, opacity=0.5]
      {0};
      \addplot3 [domain=0:360, samples y=0, samples=30, thick, z buffer=auto]
      (x,5.1,0);
      \addplot3 [surf,domain=0:360, domain y=0:5,samples=30, samples y=10]
      {-y+5};
    \end{axis}
  \end{tikzpicture}  
\end{document}

3d-cone+pgf.tex

% page 142 of book PGFPLOTS
% http://mirror.utexas.edu/ctan/graphics/pgf/contrib/pgfplots/doc/pgfplots.pdf
% arr: reindent
\documentclass[border=15pt]{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.16}

\begin{document}
	
\begin{tikzpicture}
	\begin{axis}
		[
		axis lines=center,
		axis on top,
		xlabel={$x$},
		ylabel={$y$},
		zlabel={$z$},
		domain=0:1,y domain=0:2*pi,
		xmin=-1.5,
		xmax=1.5,
		ymin=-1.5,
		ymax=1.5,
		zmin=0.0,
		mesh/interior colormap=
		{blueblack}{color=(black) color=(blue)},
		colormap/blackwhite,
		samples=10,
		samples y=40,
		z buffer=sort,
		]
			\addplot3 [surf]
			({x*cos(deg(y))},{x*sin(deg(y))},{x});
	\end{axis}
\end{tikzpicture}
	
\end{document}

3d-cube_color_rotated+3d+pgf+foreach+command+define.tex

\documentclass[parskip]{scrartcl}
\usepackage[margin=15mm,landscape]{geometry}
\usepackage{tikz}
\usepackage{keyval}
\usepackage{ifthen}

\makeatletter
% Standard Values for Parameters
\newcommand{\tikzcuboid@shiftx}{0}
\newcommand{\tikzcuboid@shifty}{0}
\newcommand{\tikzcuboid@dimx}{4}
\newcommand{\tikzcuboid@dimy}{4}
\newcommand{\tikzcuboid@dimz}{4}
\newcommand{\tikzcuboid@scale}{1}
\newcommand{\tikzcuboid@densityx}{1}
\newcommand{\tikzcuboid@densityy}{1}
\newcommand{\tikzcuboid@densityz}{1}
\newcommand{\tikzcuboid@rotation}{0}
\newcommand{\tikzcuboid@anglex}{0}
\newcommand{\tikzcuboid@angley}{90}
\newcommand{\tikzcuboid@anglez}{225}
\newcommand{\tikzcuboid@scalex}{1}
\newcommand{\tikzcuboid@scaley}{1}
\newcommand{\tikzcuboid@scalez}{1}
\newcommand{\tikzcuboid@linefront}{}
\newcommand{\tikzcuboid@linetop}{}
\newcommand{\tikzcuboid@lineright}{}
\newcommand{\tikzcuboid@fillfront}{}
\newcommand{\tikzcuboid@filltop}{}
\newcommand{\tikzcuboid@fillright}{}
\newcommand{\tikzcuboid@newcoords}{N}
\newcommand{\tikzcuboid@filled}{N}
\newcommand{\tikzcuboid@shaded}{N}
% Definition of Keys
\define@key{tikzcuboid}{shiftx}[\tikzcuboid@shiftx]{\renewcommand{\tikzcuboid@shiftx}{#1}}
\define@key{tikzcuboid}{shifty}[\tikzcuboid@shifty]{\renewcommand{\tikzcuboid@shifty}{#1}}
\define@key{tikzcuboid}{dimx}[\tikzcuboid@dimx]{\renewcommand{\tikzcuboid@dimx}{#1}}
\define@key{tikzcuboid}{dimy}[\tikzcuboid@dimy]{\renewcommand{\tikzcuboid@dimy}{#1}}
\define@key{tikzcuboid}{dimz}[\tikzcuboid@dimz]{\renewcommand{\tikzcuboid@dimz}{#1}}
\define@key{tikzcuboid}{scale}[\tikzcuboid@scale]{\renewcommand{\tikzcuboid@scale}{#1}}
\define@key{tikzcuboid}{densityx}[\tikzcuboid@densityx]{\renewcommand{\tikzcuboid@densityx}{#1}}
\define@key{tikzcuboid}{densityy}[\tikzcuboid@densityy]{\renewcommand{\tikzcuboid@densityy}{#1}}
\define@key{tikzcuboid}{densityz}[\tikzcuboid@densityz]{\renewcommand{\tikzcuboid@densityz}{#1}}
\define@key{tikzcuboid}{rotation}[\tikzcuboid@rotation]{\renewcommand{\tikzcuboid@rotation}{#1}}
\define@key{tikzcuboid}{anglex}[\tikzcuboid@anglex]{\renewcommand{\tikzcuboid@anglex}{#1}}
\define@key{tikzcuboid}{angley}[\tikzcuboid@angley]{\renewcommand{\tikzcuboid@angley}{#1}}
\define@key{tikzcuboid}{anglez}[\tikzcuboid@anglez]{\renewcommand{\tikzcuboid@anglez}{#1}}
\define@key{tikzcuboid}{scalex}[\tikzcuboid@scalex]{\renewcommand{\tikzcuboid@scalex}{#1}}
\define@key{tikzcuboid}{scaley}[\tikzcuboid@scaley]{\renewcommand{\tikzcuboid@scaley}{#1}}
\define@key{tikzcuboid}{scalez}[\tikzcuboid@scalez]{\renewcommand{\tikzcuboid@scalez}{#1}}
\define@key{tikzcuboid}{linefront}[\tikzcuboid@linefront]{\renewcommand{\tikzcuboid@linefront}{#1}}
\define@key{tikzcuboid}{linetop}[\tikzcuboid@linetop]{\renewcommand{\tikzcuboid@linetop}{#1}}
\define@key{tikzcuboid}{lineright}[\tikzcuboid@lineright]{\renewcommand{\tikzcuboid@lineright}{#1}}
\define@key{tikzcuboid}{fillfront}[\tikzcuboid@fillfront]{\renewcommand{\tikzcuboid@fillfront}{#1}}
\define@key{tikzcuboid}{filltop}[\tikzcuboid@filltop]{\renewcommand{\tikzcuboid@filltop}{#1}}
\define@key{tikzcuboid}{fillright}[\tikzcuboid@fillright]{\renewcommand{\tikzcuboid@fillright}{#1}}
\define@key{tikzcuboid}{newcoords}[\tikzcuboid@newcoords]{\renewcommand{\tikzcuboid@newcoords}{#1}}
\define@key{tikzcuboid}{filled}[\tikzcuboid@filled]{\renewcommand{\tikzcuboid@filled}{#1}}
\define@key{tikzcuboid}{shaded}[\tikzcuboid@shaded]{\renewcommand{\tikzcuboid@shaded}{#1}}

% Commands
\newcommand{\tikzcuboid}[1]{
    \setkeys{tikzcuboid}{#1} % Process Keys passed to command
    \begin{scope}[xshift=\tikzcuboid@shiftx,yshift=\tikzcuboid@shifty,scale=\tikzcuboid@scale,rotate=\tikzcuboid@rotation]
    \pgfmathsetmacro{\steppingx}{1/\tikzcuboid@densityx}
    \pgfmathsetmacro{\steppingy}{1/\tikzcuboid@densityy}
    \pgfmathsetmacro{\steppingz}{1/\tikzcuboid@densityz}
    \newcommand{\dimx}{\tikzcuboid@dimx}
    \newcommand{\dimy}{\tikzcuboid@dimy}
    \newcommand{\dimz}{\tikzcuboid@dimz}
    \pgfmathsetmacro{\secondx}{2*\steppingx}
    \pgfmathsetmacro{\secondy}{2*\steppingy}
    \pgfmathsetmacro{\secondz}{2*\steppingz}
    \foreach \x in {\steppingx,\secondx,...,\dimx}
    {   \foreach \y in {\steppingy,\secondy,...,\dimy}
        {   \pgfmathsetmacro{\lowx}{(\x-\steppingx)}
            \pgfmathsetmacro{\lowy}{(\y-\steppingy)}
            \filldraw[fill=orange,draw=blue] (\lowx,\lowy,\dimz) -- (\lowx,\y,\dimz) -- (\x,\y,\dimz) -- (\x,\lowy,\dimz) -- cycle;

        }
    }
    \foreach \x in {\steppingx,\secondx,...,\dimx}
    {   \foreach \z in {\steppingz,\secondz,...,\dimz}
        {   \pgfmathsetmacro{\lowx}{(\x-\steppingx)}
            \pgfmathsetmacro{\lowz}{(\z-\steppingz)}
            \filldraw[fill=green,draw=red] (\lowx,\dimy,\lowz) -- (\lowx,\dimy,\z) -- (\x,\dimy,\z) -- (\x,\dimy,\lowz) -- cycle;
        }
    }
    \foreach \y in {\steppingy,\secondy,...,\dimy}
    {   \foreach \z in {\steppingz,\secondz,...,\dimz}
        {   \pgfmathsetmacro{\lowy}{(\y-\steppingy)}
            \pgfmathsetmacro{\lowz}{(\z-\steppingz)}
            \filldraw[fill=red!50!blue,draw=yellow] (\dimx,\lowy,\lowz) -- (\dimx,\lowy,\z) -- (\dimx,\y,\z) -- (\dimx,\y,\lowz) -- cycle;
        }
    }
    \end{scope}

    % Write parameters to log file, just for checking       
%   \typeout{=============================}
%   \typeout{*****************************}
%   \typeout{tikzcuboid shiftx = \tikzcuboid@shiftx}
%   \typeout{tikzcuboid shifty = \tikzcuboid@shifty}
%   \typeout{tikzcuboid dimx = \tikzcuboid@dimx}
%   \typeout{tikzcuboid dimy = \tikzcuboid@dimy}
%   \typeout{tikzcuboid dimz = \tikzcuboid@dimz}
%   \typeout{tikzcuboid scale = \tikzcuboid@scale}
%   \typeout{tikzcuboid densityx = \tikzcuboid@densityx}
%   \typeout{tikzcuboid densityy = \tikzcuboid@densityy}
%   \typeout{tikzcuboid densityz = \tikzcuboid@densityz}
%   \typeout{tikzcuboid rotation = \tikzcuboid@rotation}
%   \typeout{tikzcuboid anglex = \tikzcuboid@anglex}
%   \typeout{tikzcuboid angley = \tikzcuboid@angley}
%   \typeout{tikzcuboid anglez = \tikzcuboid@anglez}
%   \typeout{tikzcuboid scalex = \tikzcuboid@scalex}
%   \typeout{tikzcuboid scaley = \tikzcuboid@scaley}
%   \typeout{tikzcuboid scalez = \tikzcuboid@scalez}
%   \typeout{tikzcuboid linefront = \tikzcuboid@linefront}
%   \typeout{tikzcuboid linetop = \tikzcuboid@linetop}
%   \typeout{tikzcuboid lineright = \tikzcuboid@lineright}
%   \typeout{tikzcuboid fillfront = \tikzcuboid@fillfront}
%   \typeout{tikzcuboid filltop = \tikzcuboid@filltop}
%   \typeout{tikzcuboid fillright = \tikzcuboid@fillright}
%   \typeout{tikzcuboid newcoords = \tikzcuboid@newcoords}
%   \typeout{tikzcuboid filled = \tikzcuboid@filled}
%   \typeout{tikzcuboid shaded = \tikzcuboid@shaded}
%   \typeout{*****************************}
%   \typeout{=============================}
}

\makeatother


\begin{document}

\begin{tikzpicture}
    \tikzcuboid{shiftx=0cm,%
        shifty=0cm,%
        scale=1.00,%
        rotation=30,%
        densityx=1,%
        densityy=2,%
        densityz=3%
    }
    \tikzcuboid{%
        shiftx=0cm,%
        shifty=8cm,%
        scale=1.00,%
        rotation=60,%
        densityx=3,%
        densityy=2,%
        densityz=5%
    }
    \tikzcuboid{%
        shiftx=8cm,%
        shifty=8cm,%
        scale=1.00,%
        rotation=45,%
        densityx=0.5,%
        densityy=1,%
        densityz=2%
    }
    \tikzcuboid{%
        shiftx=8cm,%
        shifty=0cm,%
        scale=1.00,%
        rotation=75,%
        densityx=2,%
        densityy=7,%
        densityz=2%
    }
\end{tikzpicture}

\end{document}

3d-cubes_isometric_shaded+3d.tex

% https://tex.stackexchange.com/questions/29877/need-help-creating-a-3d-cube-from-a-2d-set-of-nodes-in-tikz
% \documentclass{article}
% arr: add comments; reindent
%
\documentclass[parskip]{scrartcl}
\usepackage[margin=10mm,landscape]{geometry}
\usepackage{tikz}

\newif\ifcuboidshade
\newif\ifcuboidemphedge

\tikzset{
  cuboid/.is family,
  cuboid,
  shiftx/.initial=0,
  shifty/.initial=0,
  dimx/.initial=3,
  dimy/.initial=3,
  dimz/.initial=3,
  scale/.initial=1,
  densityx/.initial=1,
  densityy/.initial=1,
  densityz/.initial=1,
  rotation/.initial=0,
  anglex/.initial=0,
  angley/.initial=90,
  anglez/.initial=225,
  scalex/.initial=1,
  scaley/.initial=1,
  scalez/.initial=0.5,
  front/.style={draw=black,fill=white},
  top/.style={draw=black,fill=white},
  right/.style={draw=black,fill=white},
  shade/.is if=cuboidshade,
  shadecolordark/.initial=black,
  shadecolorlight/.initial=white,
  shadeopacity/.initial=0.15,
  shadesamples/.initial=16,
  emphedge/.is if=cuboidemphedge,
  emphstyle/.style={thick},
}

\newcommand{\tikzcuboidkey}[1]{\pgfkeysvalueof{/tikz/cuboid/#1}}

% Commands
\newcommand{\tikzcuboid}[1]{
    \tikzset{cuboid,#1} % Process Keys passed to command
    \pgfmathsetlengthmacro{\vectorxx}{\tikzcuboidkey{scalex}*cos(\tikzcuboidkey{anglex})*28.452756}
    \pgfmathsetlengthmacro{\vectorxy}{\tikzcuboidkey{scalex}*sin(\tikzcuboidkey{anglex})*28.452756}
    \pgfmathsetlengthmacro{\vectoryx}{\tikzcuboidkey{scaley}*cos(\tikzcuboidkey{angley})*28.452756}
    \pgfmathsetlengthmacro{\vectoryy}{\tikzcuboidkey{scaley}*sin(\tikzcuboidkey{angley})*28.452756}
    \pgfmathsetlengthmacro{\vectorzx}{\tikzcuboidkey{scalez}*cos(\tikzcuboidkey{anglez})*28.452756}
    \pgfmathsetlengthmacro{\vectorzy}{\tikzcuboidkey{scalez}*sin(\tikzcuboidkey{anglez})*28.452756}
    \begin{scope}[xshift=\tikzcuboidkey{shiftx}, yshift=\tikzcuboidkey{shifty}, scale=\tikzcuboidkey{scale}, rotate=\tikzcuboidkey{rotation}, x={(\vectorxx,\vectorxy)}, y={(\vectoryx,\vectoryy)}, z={(\vectorzx,\vectorzy)}]
      \pgfmathsetmacro{\steppingx}{1/\tikzcuboidkey{densityx}}
    \pgfmathsetmacro{\steppingy}{1/\tikzcuboidkey{densityy}}
    \pgfmathsetmacro{\steppingz}{1/\tikzcuboidkey{densityz}}
    \newcommand{\dimx}{\tikzcuboidkey{dimx}}
    \newcommand{\dimy}{\tikzcuboidkey{dimy}}
    \newcommand{\dimz}{\tikzcuboidkey{dimz}}
    \pgfmathsetmacro{\secondx}{2*\steppingx}
    \pgfmathsetmacro{\secondy}{2*\steppingy}
    \pgfmathsetmacro{\secondz}{2*\steppingz}
    \foreach \x in {\steppingx,\secondx,...,\dimx}
    { \foreach \y in {\steppingy,\secondy,...,\dimy}
      {   \pgfmathsetmacro{\lowx}{(\x-\steppingx)}
        \pgfmathsetmacro{\lowy}{(\y-\steppingy)}
        \filldraw[cuboid/front] (\lowx,\lowy,\dimz) -- (\lowx,\y,\dimz) -- (\x,\y,\dimz) -- (\x,\lowy,\dimz) -- cycle;
      }
      }
    \foreach \x in {\steppingx,\secondx,...,\dimx}
    { \foreach \z in {\steppingz,\secondz,...,\dimz}
      {   \pgfmathsetmacro{\lowx}{(\x-\steppingx)}
        \pgfmathsetmacro{\lowz}{(\z-\steppingz)}
        \filldraw[cuboid/top] (\lowx,\dimy,\lowz) -- (\lowx,\dimy,\z) -- (\x,\dimy,\z) -- (\x,\dimy,\lowz) -- cycle;
          }
      }
      \foreach \y in {\steppingy,\secondy,...,\dimy}
    { \foreach \z in {\steppingz,\secondz,...,\dimz}
      {   \pgfmathsetmacro{\lowy}{(\y-\steppingy)}
        \pgfmathsetmacro{\lowz}{(\z-\steppingz)}
        \filldraw[cuboid/right] (\dimx,\lowy,\lowz) -- (\dimx,\lowy,\z) -- (\dimx,\y,\z) -- (\dimx,\y,\lowz) -- cycle;
      }
    }
    \ifcuboidemphedge
      \draw[cuboid/emphstyle] (0,\dimy,0) -- (\dimx,\dimy,0) -- (\dimx,\dimy,\dimz) -- (0,\dimy,\dimz) -- cycle;%
      \draw[cuboid/emphstyle] (0,\dimy,\dimz) -- (0,0,\dimz) -- (\dimx,0,\dimz) -- (\dimx,\dimy,\dimz);%
      \draw[cuboid/emphstyle] (\dimx,\dimy,0) -- (\dimx,0,0) -- (\dimx,0,\dimz);%
      \fi

      \ifcuboidshade
      \pgfmathsetmacro{\cstepx}{\dimx/\tikzcuboidkey{shadesamples}}
      \pgfmathsetmacro{\cstepy}{\dimy/\tikzcuboidkey{shadesamples}}
      \pgfmathsetmacro{\cstepz}{\dimz/\tikzcuboidkey{shadesamples}}
      \foreach \s in {1,...,\tikzcuboidkey{shadesamples}}
      {   \pgfmathsetmacro{\lows}{\s-1}
          \pgfmathsetmacro{\cpercent}{(\lows)/(\tikzcuboidkey{shadesamples}-1)*100}
          \fill[opacity=\tikzcuboidkey{shadeopacity},color=\tikzcuboidkey{shadecolorlight}!\cpercent!\tikzcuboidkey{shadecolordark}] (0,\s*\cstepy,\dimz) -- (\s*\cstepx,\s*\cstepy,\dimz) -- (\s*\cstepx,0,\dimz) -- (\lows*\cstepx,0,\dimz) -- (\lows*\cstepx,\lows*\cstepy,\dimz) -- (0,\lows*\cstepy,\dimz) -- cycle;
          \fill[opacity=\tikzcuboidkey{shadeopacity},color=\tikzcuboidkey{shadecolorlight}!\cpercent!\tikzcuboidkey{shadecolordark}] (0,\dimy,\s*\cstepz) -- (\s*\cstepx,\dimy,\s*\cstepz) -- (\s*\cstepx,\dimy,0) -- (\lows*\cstepx,\dimy,0) -- (\lows*\cstepx,\dimy,\lows*\cstepz) -- (0,\dimy,\lows*\cstepz) -- cycle;
          \fill[opacity=\tikzcuboidkey{shadeopacity},color=\tikzcuboidkey{shadecolorlight}!\cpercent!\tikzcuboidkey{shadecolordark}] (\dimx,0,\s*\cstepz) -- (\dimx,\s*\cstepy,\s*\cstepz) -- (\dimx,\s*\cstepy,0) -- (\dimx,\lows*\cstepy,0) -- (\dimx,\lows*\cstepy,\lows*\cstepz) -- (\dimx,0,\lows*\cstepz) -- cycle;
      }
      \fi 

    \end{scope}
}

\makeatother

\begin{document}


\begin{tikzpicture}
    % cuboid #1
    \tikzcuboid{%
      shiftx=0cm,%
      shifty=8cm,%
      scale=1.00,%
      rotation=0,%
      densityx=2,%
      densityy=2,%
      densityz=2,%
      dimx=3,%
      dimy=3,%
      dimz=3,%
      scalex=1,%
      scaley=1,%
      scalez=1,%
      anglex=-30,%
      angley=90,%
      anglez=210,%
      front/.style={draw=green!50!black,fill=green!50!white},%
      top/.style={draw=green!50!black,fill=green!50!white},%
      right/.style={draw=green!50!black,fill=green!50!white},%
      emphedge,%
      emphstyle/.style={line width=1pt, green!12!black,densely dashed},
      shade,%
      shadesamples=64,%
      shadeopacity=0.15,%
    }
    \tikzcuboid{%
      % cuboid #2
      shiftx=8cm,%
      shifty=8cm,%
      shadeopacity=0.30,%
    }   
    \tikzcuboid{%
      % cuboid #3
      shiftx=16cm,%
      shifty=8cm,%
      shadeopacity=0.60,%
    }   
    \tikzcuboid{%
      % cuboid #4
      shiftx=0cm,%
      shifty=0cm,%
      scale=1.00,%
      rotation=0,%
      densityx=1,%
      densityy=1,%
      densityz=1,%
      dimx=4,%
      dimy=4,%
      dimz=4,%
      front/.style={draw=blue!75!black,fill=blue!25!white},%
      right/.style={draw=blue!25!black,fill=blue!75!white},%
      top/.style={draw=blue!50!black,fill=blue!50!white},%
      anglex=-7,%
      angley=90,%
      anglez=221.5,%
      scalex=1,%
      scaley=1,%
      scalez=0.5,%
      emphedge=false,%
      shade,%
      shadeopacity=0.15,%
    }
    \tikzcuboid{%
      % cuboid #5
      shiftx=8cm,%
      shifty=0cm,%
      shadeopacity=0.30,%
    }
    \tikzcuboid{%
      % cuboid #6
      shiftx=16cm,%
      shifty=0cm,%
      shadeopacity=0.60,%
    }
\end{tikzpicture}

\end{document}

3d-cylinder-planes+3d.tex

\documentclass[landscape]{article}
\usepackage{tikz}
% arr: new page size; clean up redundant packages

%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>

\usepackage{tikz-3dplot}

\begin{document}

\begin{figure}
	\centering
	\tdplotsetmaincoords{70}{120}

	\begin{tikzpicture}[tdplot_main_coords][scale=0.75]
		\tikzstyle{every node}=[font=\small]
		\draw[thick,-latex] (0,0,0) -- (6,0,0) node[anchor=north east]{$x$};
		\draw[thick,-latex] (0,0,0) -- (0,6,0) node[anchor=north west]{$y$};
		\draw[thick,-latex] (0,0,0) -- (0,0,6) node[anchor=south]{$z$};
		\draw [thick](0,0,0) circle (3);
		\draw [thick](0,0,4) circle (3);
		\draw [thick](1.9,-2.35,0) -- (1.9,-2.35,4) node[midway, left]{$r=r_1$ surface};
		\draw [thick](-1.9,2.35,0) -- (-1.9,2.35,4);
		\filldraw[fill=orange, nearly transparent] (-4,-4,4) -- (4,-4,4) --  (4,5,4) -- (-4,5,4) -- (-4,-4,4);
		\filldraw[fill=blue, nearly transparent] (0,0,4) -- (5.2,6,4) --  (5.2,6,0) -- (0,0,0) -- (0,0,4);
		\filldraw [color=blue](2,2.25,4) circle (0.075cm) ;
		\draw (-4,5,4) node[anchor=south]{$z=z_1$ plane};
		\draw (5.2,6,0) node[anchor=south west]{$\phi=\phi_1$ plane};
		\node at (1.8,1,4)  { $P_1(r_1,\phi_1,z_1)$};
		\draw[ultra thick,-latex](2,2.25,4) -- (3,3.45,4) node[anchor=north] {$\mathbf{a}_r$};
		\draw[ultra thick,-latex](2,2.25,4) -- (1,2.5,4) node[anchor=north west] {$\mathbf{a}_\phi$};
		\draw[ultra thick,-latex](2,2.25,4) -- (2,2.25,4.75) node[anchor=north west] {$\mathbf{a}_z$};
		\draw [thick,->](4,0,0) arc (0:45:4 and 4.5);
		\draw (3.6,2,0) node[anchor=north] {$\phi_1$};
		\draw[ultra thick,-latex](0,0,0) -- (2,2.35,0);
		\draw (1,1,0) node[anchor=north] {$r_1$};
		\draw [ultra thick] (2,2.25,4)--(1.95,2.25,0);
		
		\draw[ultra thick](0.1,0,4) -- (-0.1,0,4) node[anchor=south west] {$z_1$};
	\end{tikzpicture}
\end{figure}
\end{document}

3d-gradient-colored.tex

% https://github.com/MartinThoma/LaTeX-examples/blob/master/tikz/3d-gradient-colored/3d-gradient-colored.tex
% arr: reindenting
\documentclass[varwidth=true, border=2pt]{standalone}

\usepackage[usenames,dvipsnames]{xcolor}
\usepackage{pgfplots}

\pgfplotsset{compat=1.13}
\usetikzlibrary{arrows.meta}

\begin{document}
\pgfplotsset{
    colormap={whitered}{
        color(0.000cm)=(blue!50!black);
        color(0.125cm)=(blue);
        color(0.250cm)=(SkyBlue);
        color(0.375cm)=(SkyBlue);
        color(0.500cm)=(SpringGreen);
        color(0.625cm)=(yellow);
        color(0.750cm)=(yellow);
        color(0.875cm)=(red);
        color(1.000cm)=(red!50!black)
    }
}

\begin{tikzpicture}
    \begin{axis}[
        domain=-2:2,
        view={0}{90},
        axis background/.style={fill=white},
        xmin=-2, xmax=2,
        ymin=-2, ymax=2,
        axis equal image,
        point meta rel=per plot
    ]
        \addplot3
            [surf,
            samples=50,
            shader=interp,
            colormap name=whitered
            ]
                {x/exp(x^2+y^2)};
        % \addplot3[contour gnuplot={number=15, labels=false},
        %           very thick,
        %           samples=30]
        %         {x/exp(x^2+y^2)};
        \addplot3
            [blue,
            point meta={
                sqrt(
                    ((1-2*x^2)*exp(-x^2-y^2))^2+
                    (-2*x*y*exp(-x^2-y^2))^2
                )
            },
            quiver={
                    u={(1-2*x^2)*exp(-x^2-y^2)},
                    v={-2*x*y*exp(-x^2-y^2)},
                    scale arrows=0.3,
                    every arrow/.append style={%
                        -{Latex[scale length={max(0.01,\pgfplotspointmetatransformed/1000)}]},
                        },
            },
            samples=15]
                {x/exp(x^2+y^2)};
    \end{axis}
\end{tikzpicture}
\end{document}

3d-hypersurface-3.tex

% https://github.com/MartinThoma/LaTeX-examples/blob/master/tikz/hypersurface-3/hypersurface-3.tex
\documentclass{article}

\usepackage[pdftex,active,tightpage]{preview}
\setlength\PreviewBorder{2mm}
\usepackage{pgfplots}
\usepackage{units}

\pgfplotsset{compat=1.3}% <-- moves axis labels near ticklabels
                        % (respects tick label widths)
\usepackage{tikz}
\usetikzlibrary{arrows, positioning, calc, intersections, decorations.markings}

\usepackage{xcolor}
\definecolor{horizontalLineColor}{HTML}{008000}
\definecolor{verticalLineColor}{HTML}{FF0000}


\begin{document}

% Define this as a command to ensure that it is same in both cases
\newcommand*{\ShowIntersection}[2]{
\fill
    [name intersections={of=#1 and #2, name=i, total=\t}]
    [red, opacity=1, every node/.style={above left, black, opacity=1}]
    \foreach \s in {1,...,\t}{(i-\s) circle (2pt)
        node [above left] {\s}};
}

\begin{preview}
\begin{tikzpicture}
    \begin{axis}[
        grid=both,
        minor tick num=1,
        xlabel=$x$,
        ylabel=$y$,
        zlabel=$z$,
        %label distance=0mm,
        %width=8cm, height=7cm,     % size of the image
        axis lines=left,
        %tick style={draw=none},
        %xticklabels={,,},
        %yticklabels={,,}
    ]
      \addplot3[surf, colormap name=viridis] {-3/25*x*x+1/25*y*y};
    \end{axis}
\end{tikzpicture}
\end{preview}

\end{document}

3d-physics-jet-cones+3d+physics.tex

% https://wiki.physik.uzh.ch/cms/latex:tikz:jet_cones
\documentclass{standalone}

\usepackage{amsmath} % for \dfrac
\usepackage{tikz}
\usepackage{tikz-3dplot}

\tikzset{>=latex} % for LaTeX arrow head
\usetikzlibrary{decorations.pathmorphing} % for snake

% colors
\definecolor{mylightred}{RGB}{255,200,200}
\definecolor{myblue}{RGB}{172,188,63}
\definecolor{mylightgreen}{RGB}{150,220,150}

% split figures into pages
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{1pt}%

% draw two cones
\begin{document}

% BOOSTED TAU
\begin{tikzpicture}
	% AK8 variables
	\def\x{2.4}
	\def\y{3.5}
	\def\R{\x+0.02}
	\def\yc{\y+0.08}
	\def\e{0.6}
	
	% AK8 cone
	\shade[right color=white,left color=blue,opacity=0.2]
	(-\x,\y) -- (-\x,\yc) arc (180:360:{\R} and \e) -- (\x,\y) -- (0,0) -- cycle;
	%\shade[right color=white,left color=blue,opacity=0.2]
	%(0,\yc) circle ({\R} and \e);
	%(-\x,\yc) -- ( \x,\yc) arc ( -2:182:{\R} and \e) -- (\x,\yc) -- (0,0) -- cycle;
	\draw[fill=blue,opacity=0.2]
	(0,\yc) circle ({\R} and \e);
	\draw
	(-\x,\y) -- (0,0) -- (\x,\y);
	\draw
	(0,\yc) circle ({\R} and \e);
	
	% AK4 variables
	\def\x{1.0}
	\def\y{4.0}
	\def\R{\x+0.005}
	\def\yc{\y+0.04}
	\def\e{0.4}
	
	% AK4 cone 1
	\begin{scope}[rotate=12]
		\shade[right color=white,left color=green,opacity=0.3]
		(-\x,\yc) -- (-\x,\yc) arc (180:360:{\R} and \e) -- (\x,\yc) -- (0,0) -- cycle;
		\draw[fill=green,opacity=0.2]
		(0,\yc) circle ({\R} and \e);
		\draw
		(-\x,\y) -- (0,0) -- (\x,\y);
		\draw
		(0,\yc) circle ({\R} and \e);
	\end{scope}
	
	% AK4 cone 2
	\begin{scope}[rotate=-10]
		\shade[right color=white,left color=red,opacity=0.3]
		(-\x,\yc) -- (-\x,\yc) arc (180:360:{\R} and \e) -- (\x,\yc) -- (0,0) -- cycle;
		\draw[fill=red,opacity=0.2]
		(0,\yc) circle ({\R} and \e);
		\draw
		(-\x,\y) -- (0,0) -- (\x,\y);
		\draw
		(0,\yc) circle ({\R} and \e);
	\end{scope}
\end{tikzpicture}

% TikZ code
% 2D CONE
\begin{tikzpicture}%,scale=0.85
	% cone variables
	\def\x{2.0}
	\def\y{4.0}
	\def\R{\x}
	\def\yc{\y+0.02}
	\def\e{0.4}
	
	% cone shades + frame
	\shade[right color=white,left color=mylightgreen,opacity=0.3]
	(-\x,\yc) -- (-2,4) arc (180:360:{\R} and \e) -- (\x,\yc) -- (0,0) -- cycle;
	\draw[fill=green,opacity=0.2]
	(0,\yc) circle ({\R} and \e);
	\draw
	(-\x,\y) -- (0,0) -- (\x,\y);
	\draw
	(0,\yc) circle ({\R} and \e);
	
	% tracks
	\draw[thick]
	(0,0) arc (320:360:-3 and 6.0); %node[above] {1};
	\draw[thick]
	(0,0) arc (-70:  0:0.8 and 3.5); %node[above] {2};
	\draw[thick]
	(0,0) arc (  0: 70:0.9 and 4.5); %node[above] {3};
	\draw[thick]
	(0,0) arc (180:140:2 and 6.0); %node[above] {4};
	\draw[thick,dashed]
	(0,0) -- (1,4.6);
\end{tikzpicture}
\end{document}

3d-plane-sine_wave.tex

\documentclass[margin=10pt]{standalone}
\usepackage{tikz}
\usepackage{tikz-3dplot}
\begin{document}

\tdplotsetmaincoords{70}{70}
\begin{tikzpicture}[scale=3,tdplot_main_coords]

\fill[draw=red, fill=red!20, variable=\z,domain=-.5:1,samples=200] 
    (0,0,-.5) plot (0,{sin(\z*pi r*4)/10},\z)
    -- (0,1,1)
    -- (0,1,-0.5)
    -- cycle;

\draw[thick,->] (0,-0.2,0) -- (0,1.2,0) node[anchor=north west]{$x$};
\draw[thick,->] (0,0,-0.5) -- (0,0,1.2) node[anchor=south]{$z$};
\draw[thick,->] (-0.5,0,0) -- (1.2,0,0) node[anchor=north east]{$y$};
\end{tikzpicture}
\end{document}

3d-seismic_focal_mechanism+3d+set+foreach+eng.tex

% http://www.texample.net/media/tikz/examples/TEX/seismic-focal-mechanism-in-3d-view.tex
% Title: Seismic focal mechanism in 3D view.
% Author: Cyril Langlois
% Source:  Jacques Duma
% Site: http://math.et.info.free.fr/TikZ/index.html
%
% Adaptation for LaTeX of a figure proposed in P. Shearer's book 'Introduction
% to Seismology'.
%
% It shows the focal sphere with the fault plane and auxiliary plane (which can
% not be discriminate), limiting compression and dilatation quadrants, the first
% movement of the rock through the sphere, and the Pression and Tension axis.
%
% The figure is based on the sphere drawing's code proposed by J. Dumas in is
% book 'Tikz pour l'impatient', available online.

\documentclass[11pt]{article}
\usepackage{tikz}
\usepackage{tikz-3dplot}
%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>

\begin{comment}
:Title: Seismic focal mechanism in 3D view.
:Tags: 3D; Earth Sciences ; Geophysics; Seismology
:Author: Cyril Langlois
:Source: http://math.et.info.free.fr/TikZ/index.html

Adaptation for LaTeX of a figure proposed in P. Shearer's book 'Introduction to Seismology'. 

It shows the focal sphere with the fault plane and auxiliary plane (which can
not be discriminate), limiting compression and dilatation quadrants, the first
movement of the rock through the sphere, and the Pression and Tension axis.

The figure is based on the sphere drawing's code proposed by J. Dumas in is
book `Tikz pour l'impatient <http://math.et.info.free.fr/TikZ/>`_, available online.

\end{comment}

%%%%%%%%%%%
%% helper macros
%: Styles for XYZ-Coordinate Systems
%: isometric  South West : X , South East : Y , North : Z
\tikzset{isometricXYZ/.style={x={(-0.866cm,-0.5cm)}, y={(0.866cm,-0.5cm)}, z={(0cm,1cm)}}}

%: isometric South West : Z , South East : X , North : Y
\tikzset{isometricZXY/.style={x={(0.866cm,-0.5cm)}, y={(0cm,1cm)}, z={(-0.866cm,-0.5cm)}}}

%: isometric South West : Y , South East : Z , North : X
\tikzset{isometricYZX/.style={x={(0cm,1cm)}, y={(-0.866cm,-0.5cm)}, z={(0.866cm,-0.5cm)}}}

%% document-wide tikz options and styles
\begin{document}
\begin{tikzpicture} [scale=4, isometricZXY, line join=round,
        opacity=.75, text opacity=1.0,%
        >=latex,
        inner sep=0pt,%
        outer sep=2pt,%
    ]
    \def\h{5}

    \newcommand{\quadrant}[2]{
        \foreach \t in {#1} \foreach \f in {175,165,...,5}
            \draw [fill=#2]
                  ({sin(\f - \h)*cos(\t - \h)}, {sin(\f - \h)*sin(\t - \h)}, {cos(\f - \h)})
               -- ({sin(\f - \h)*cos(\t + \h)}, {sin(\f - \h)*sin(\t + \h)}, {cos(\f - \h)})
               -- ({sin(\f + \h)*cos(\t + \h)}, {sin(\f + \h)*sin(\t + \h)}, {cos(\f + \h)})
               -- ({sin(\f + \h)*cos(\t - \h)}, {sin(\f + \h)*sin(\t - \h)}, {cos(\f + \h)})
               -- cycle;
    }

    %Quadrants
    \quadrant{220,230,...,300}{black}
    \quadrant{-60,-50,...,20}{white}
    \quadrant{30,40,...,120}{black}
    \quadrant{130,140,...,210}{none}

    %Movement arrows
    \foreach \t in {225,235,...,295}
        \foreach \f in {50,40,...,0}
            \draw [red, opacity=1.0, ->, thick]
                ({sin(\f - \h)*cos(\t - \h)}, {sin(\f - \h)*sin(\t - \h)}, {cos(\f - \h)})
                -- ({(1 + 0.2*cos(90 - \f))*sin(\f - \h)*cos(\t - \h)},
                    {(1 + 0.2*cos(90 - \f))*sin(\f - \h)*sin(\t - \h)},
                    {(1 + 0.2*cos(90 - \f))*cos(\f - \h)});

    \foreach \t in {125,135,...,205}
        \foreach \f in {110,100,...,0}
            \draw [black, ->, thick]
                ({(1 + 0.2*cos(90 - \f))*sin(\f - \h)*cos(\t - \h)},
                 {(1 + 0.2*cos(90 - \f))*sin(\f - \h)*sin(\t - \h)},
                 {(1 + 0.2*cos(90 - \f))*cos(\f - \h)})
                -- ({sin(\f - \h)*cos(\t - \h)},{sin(\f - \h)*sin(\t - \h)},{cos(\f - \h)});
    \foreach \t in {35,45,...,115}
        \foreach \f in {130,120,...,0}
            \draw [red, opacity=1.0 ,->, thick]
                ({sin(\f - \h)*cos(\t - \h)}, {sin(\f - \h)*sin(\t - \h)}, {cos(\f - \h)})
                -- ({(1 + 0.2*cos(90 - \f))*sin(\f - \h)*cos(\t - \h)},
                    {(1 + 0.2*cos(90 - \f))*sin(\f - \h)*sin(\t - \h)},
                    {(1 + 0.2*cos(90 - \f))*cos(\f - \h)});

    \foreach \t in {-55,-45,...,25}
        \foreach \f in {130,120,...,0}
            \draw [black, ->, thick]
                ({(1 + 0.2*cos(90 - \f))*sin(\f - \h)*cos(\t - \h)},
                 {(1 + 0.2*cos(90 - \f))*sin(\f - \h)*sin(\t - \h)},
                 {(1 + 0.2*cos(90 - \f))*cos(\f - \h)})
              -- ({sin(\f - \h)*cos(\t - \h)},{sin(\f - \h)*sin(\t - \h)},{cos(\f - \h)});

    %Annotations
    \path ({1.5*sin(100)*cos(75)}, {1.5*sin(100)*sin(75)}, {1.5*cos(100)}) node [right] {Compression};
    \path ({1.5*sin(70)*cos(-15)}, {1.5*sin(70)*sin(-15)}, {1.5*cos(70)})  node [right] {Dilatation};
    \path ({1.25*sin(50)*cos(165)},{1.25*sin(50)*sin(165)},{1.25*cos(50)}) node [left]  {Dilatation};
    \path ({1.25*sin(30)*cos(255)},{1.25*sin(30)*sin(255)},{1.25*cos(30)}) node [left]  {Compression};

    %P and T axis
    \begin{scope}[ultra thick]
        \draw[->] ({1.75*sin(90)*cos(75)}, {1.75*sin(90)*sin(75)}, {1.75*cos(90)})
            -- ({2*sin(90)*cos(75)},{2*sin(90)*sin(75)},{2*cos(90)}) node [above] {T-axis};
        \draw[->] ({1.75*sin(90)*cos(255)},{1.75*sin(90)*sin(255)},{1.75*cos(90)})
            -- ({2*sin(90)*cos(255)},{2*sin(90)*sin(255)},{2*cos(90)}) node [below] {T-axis};
        \draw[<-] ({1.5*sin(90)*cos(-15)}, {1.5*sin(90)*sin(-15)}, {1.5*cos(90)})
            -- ({1.75*sin(90)*cos(-15)},{1.75*sin(90)*sin(-15)},{1.75*cos(90)}) node [right] {P-axis};
        \draw[<-] ({1.5*sin(90)*cos(165)}, {1.5*sin(90)*sin(165)}, {1.5*cos(90)})
            -- ({1.75*sin(90)*cos(165)},{1.75*sin(90)*sin(165)},{1.75*cos(90)}) node [left] {P-axis};
    \end{scope}

    % Label
    \node [anchor=north, yshift=-2mm] at (current bounding box.south)
        {Seismic focal mechanism and Pression-Tension axis.};
\end{tikzpicture}
\end{document}

3d-solid-of-revolution.tex

% https://github.com/MartinThoma/LaTeX-examples/blob/master/tikz/solid-of-revolution/solid-of-revolution.tex
% Author: Marco Miani
\documentclass[varwidth=true, border=2pt]{standalone}

\usepackage{pgfplots}
\pgfplotsset{compat=1.9}

\begin{document}
\pgfplotsset{
    colormap={whitered}{
        color(0cm)=(white);
        color(1cm)=(orange!75!red)
    }
    %colormap={color}{color(0cm)=(white); color(1cm)=(blue)}
}

\begin{tikzpicture}
    \begin{axis}[view={60}{30}]
        \addplot3[surf,
        samples=50,
        domain=1:2,y domain=0:2*pi,
        z buffer=sort]
        %({(2 + tan(deg(y)))*cos((deg(x)))}, {(2 + cos(x)) * sin(x)}, {x});
        ({x * cos(deg(y))}, {x * sin(deg(y))}, {1/x});
    \end{axis}
\end{tikzpicture}
\end{document}

3d-torus+function+3d.tex

% 3d-torus.tex
\documentclass[border=5pt]{standalone}
%%%<
\usepackage{verbatim}
%%%>
\usepackage{pgfplots}
\pgfplotsset{width=7cm,compat=1.8}

\begin{comment}
:Title: Torus
:Tags: Surface plots
:Author: cmhughes
:Slug: torus

For drawing a torus, we can parametrize the surface as (for example)

x(t,s) = (2+cos(t))*cos(s+pi/2) 
y(t,s) = (2+cos(t))*sin(s+pi/2) 
z(t,s) = sin(t)

where both t and s take values on [0,2pi].

This code was written by cmhughes on TeX.SE.
\end{comment}

\begin{document}
\begin{tikzpicture}
  \begin{axis}
     \addplot3[
         surf,
         colormap/cool,
         samples=20,
         domain=0:2*pi,
         y domain=0:2*pi,
         z buffer=sort
       ]
       ( {(2+cos(deg(x)))*cos(deg(y+pi/2))}, 
         {(2+cos(deg(x)))*sin(deg(y+pi/2))}, 
         {sin(deg(x))}
       );
  \end{axis}
\end{tikzpicture}
\end{document}

ai-artificial_intelligence_aiama_arr.tex

% Artificial Intelligence Agent Contributors
% Drawn by Alfonso R. Reyes
% November 27, 2020
% Personal interpretation of "Artificial Intelligence: A Modern Approach" by Peter Norvig and Stuart Russell
% Original diagram: https://github.com/FriendlyUser/LatexDiagrams
\documentclass[border=5pt]{standalone}
\usepackage{xcolor}
\usepackage{ulem}


	\definecolor{ocre}{HTML}{800000}
	\definecolor{sky}{HTML}{C6D9F1}
	\definecolor{skybox}{HTML}{5F86B3}

\usepackage{tikz}
\usepackage{pgfmath}
\usetikzlibrary{decorations.text, arrows.meta,calc,shadows.blur,shadings}

\renewcommand*\familydefault{\sfdefault} % Set font to serif family

% arctext from Andrew code with modifications:
%Variables: 1: ID, 2:Style 3:box height 4: Radious 5:start-angl 6:end-angl 7:text {format along path} 
\def\arctext[#1][#2][#3](#4)(#5)(#6)#7{

\draw[#2] (#5:#4cm+#3) coordinate (above #1) arc (#5:#6:#4cm+#3)
             -- (#6:#4) coordinate (right #1) -- (#6:#4cm-#3) coordinate (below right #1) arc (#6:#5:#4cm-#3) coordinate (below #1)
             -- (#5:#4) coordinate (left #1) -- cycle;
            \def\a#1{#4cm+#3}
            \def\b#1{#4cm-#3}
\path[
    decoration={
        raise = -0.5ex, % Controls relavite text height position.
        text  along path,
        text = {#7},
        text align = center,        
    },
    decorate
    ]
    (#5:#4) arc (#5:#6:#4);
}

% arcarrow, this is mine, for beerware purpose...
% Function: Draw an arrow from arctex coordinate specific nodes to another 
% Arrow start at the start of arctext box and could be shifted to change the position
% to avoid go over another box.
% Var: 1:Start coordinate 2:End coordinate 3:angle to shift from acrtext box  
\def\arcarrow(#1)(#2)[#3]{
    \draw[very thick,->,>=latex,black!60] 
        let \p1 = (#1), \p2 = (#2), % To access cartesian coordinates x, and y.
            \n1 = {veclen(\x1,\y1)}, % Distance from the origin
            \n2 = {veclen(\x2,\y2)}, % Distance from the origin
            \n3 = {atan2(\y1,\x1)} % Angle where acrtext starts.
        in (\n3-#3: \n1) -- (\n3-#3: \n2); % Draw the arrow.
}


\begin{document}
\begin{tikzpicture}[
	    % Environment Cfg
	    font=\sf    \scriptsize,
	    % Styles
	    myarrow/.style={
	        very thick,
	        -latex,
            black!60,            
	    },
	    Center/.style ={
	        circle,
	        fill=ocre,
	        text=white,
	        align=center,
	        font =\footnotesize\bf,
	        inner sep=1pt,          
	    },
	    RedArc/.style ={
	        color=black,
	        thick,
	        fill=ocre,
	        blur shadow, 
	    },
	    SkyArc/.style ={
	        color=skybox,
	        thick,
	        fill=sky,
	        blur shadow, 
	    },
    ]

    % Drawing the center for AI
    \node[Center](AI) at (0,0) { Artificial \\ Intelligence \\(AI)\\ Agent};
    \coordinate (AROUND) at (0:1.2); 

    % Drawing the Text Arcs
    % Format: \Arctext[ID][box-style][box-height](radious)(start-angl)(end-angl){|text-styles| Text}
    
	% Machine Learning
    \arctext[ML][RedArc][8pt](2.75)(140)(75){|\footnotesize\bf\color{white}| Machine Learning};
	\arctext[REIN][SkyArc][5pt](3.50)(140)(75){|\scriptsize\color{black}| Reinforcement Learning};
	\arctext[KNOW][SkyArc][5pt](4.00)(110)(75){|\scriptsize| Knowledge L.};
	\arctext[SUPL][SkyArc][5pt](4.00)(140)(112){|\scriptsize| Supervised L.};
	\arctext[PROB][SkyArc][5pt](4.50)(140)(109){|\scriptsize\color{black}| Probabilistic Models};
	\arctext[PROB][SkyArc][5pt](4.50)(107)(75){|\scriptsize\color{black}| Unsupervised L.};
    
    % Problem Solving
    \arctext[SOLV][RedArc][8pt](2.75)(70)(23){|\footnotesize\bf\color{white}| Problem Solving};
    \arctext[SRCH][SkyArc][5pt](3.50)(70)(23){|\scriptsize\color{black}| Search };
    \arctext[HEUR][SkyArc][5pt](4.00)(70)(50){|\scriptsize| Heuristics};
	\arctext[ADVS][SkyArc][5pt](4.00)(47)(23){|\scriptsize| Adversarial S.};    
	\arctext[CONST][SkyArc][5pt](4.50)(70)(23){|\scriptsize\color{black}| Constraint Analysis };
	   
	% Natural Language Processing
	\arctext[NLP][RedArc][8pt](2.75)(20)(-17){|\footnotesize\bf\color{white}| NLP};
	\arctext[TRAN][SkyArc][5pt](3.50)(20)(-20){|\scriptsize\color{black}| Machine translation};
	\arctext[SPER][SkyArc][5pt](4.00)(20)(-20){|\scriptsize| Speech Recognition};
	\arctext[INFX][SkyArc][5pt](4.50)(20)(-20){|\scriptsize\color{black}| Information Extraction};    

    % Decision Making
    \arctext[DEC][RedArc][8pt](2.75)(293)(340){|\footnotesize\bf\color{white}| Decision Making};
    \arctext[LOG][SkyArc][5pt](3.50)(293)(335){|\scriptsize\color{black}| Logic};
    \arctext[KNOW][SkyArc][5pt](4.00)(293)(335){|\scriptsize| Knowledge Engineering};
    \arctext[PLAN][SkyArc][5pt](4.50)(293)(335){|\scriptsize| Real World Planning};
    
    % Reasoning
    \arctext[REAS][RedArc][8pt](2.75)(247)(291){|\footnotesize\bf\color{white} | Reasoning};
    \arctext[PROB][SkyArc][5pt](3.50)(247)(291){|\scriptsize\color{black}| Probabilistic R.};
    \arctext[REAT][SkyArc][5pt](4.00)(247)(271){|\scriptsize| Bayesian Nets};
    \arctext[REAT][SkyArc][5pt](4.00)(272)(291){|\scriptsize| R.over time};
    \arctext[UNQU][SkyArc][5pt](4.50)(247)(291){|\scriptsize\color{black}| Uncertainty Quantification};
    
    % Robotics
    \arctext[ROB][RedArc][8pt](2.75)(210)(245){|\footnotesize\bf\color{white}|  Robotics};
    \arctext[RPER][SkyArc][5pt](3.50)(210)(245){|\scriptsize\color{black}| R. Perception};
    \arctext[RACT][SkyArc][5pt](4.00)(210)(245){|\scriptsize| R. Actuation};
    \arctext[MAPL][SkyArc][5pt](4.50)(210)(245){|\scriptsize\color{black}| Mapping, Localization};
    
    % Object Recognition
    \arctext[RECO][RedArc][8pt](2.75)(145)(206){|\footnotesize\bf\color{white}| Object Recognition};
    \arctext[VIS][SkyArc][5pt](3.50)(145)(206){|\scriptsize\color{black}| Vision};
    \arctext[IMGP][SkyArc][5pt](4.00)(145)(175){|\scriptsize\color{black}| Image Processing };
    \arctext[IMGP][SkyArc][5pt](4.00)(176)(206){|\scriptsize\color{black}| 3D Reconstruction };
    \arctext[MOTC][SkyArc][5pt](4.50)(145)(206){|\scriptsize\color{black}| Motion, shading, contour analysis};   
  

%    %ADITIONAL EXTERNAL ARC
%   \arctext[NEW][
%       color=white,
%       shade,      
%       upper left=gray,
%       upper right=black!50,
%       lower left=gray,
%       lower right=gray!50,
%       rounded corners = 8pt
%       ][8pt](5.2)(180)(0){|\footnotesize\bf\color{white}| "Artificial Intelligence: A Modern Approach" by Peter Norvig and Stuart Russell};

    % Drawing the Arrows from contributing branch to AI
    % Format: \arcarrow(above/below ID)(abobe/below ID)[shift]
    \arcarrow(below ML)(AROUND)[30];
    \arcarrow(below SOLV)(AROUND)[24];
    \arcarrow(below NLP)(AROUND)[15];
    \arcarrow(below DEC)(AROUND)[-25];
    \arcarrow(below REAS)(AROUND)[-17];
    \arcarrow(below ROB)(AROUND)[-19];
    \arcarrow(below RECO)(AROUND)[-33];

    % Same level Arrows. Not needed now
    % \draw[myarrow] (left SSNX) -- (right DUAM);
    % \draw[myarrow] (left ML) -- (left SRel);
    % \draw[myarrow] (left SCap) -- (right ML);

	% Legend
    \draw[myarrow] (-5,-5) coordinate (legend) -- ++(.8,0) node[anchor=west] {(contribution)};
    \draw [RedArc] (legend)++(0,-0.4) rectangle ++(.8,-.3)++(0,.2) node [anchor=west, text width=3em] {capabilities,\\disciplines};
    \draw[SkyArc] (legend)++(0,-1) rectangle ++(.8,-.3)++(0,.2) node[anchor=west, color=black] {subfield};
        
    % source, book and authors
    \node [text width=6.45cm] at (1,-5.6) {Source: \textit {"Artificial Intelligence: A Modern Approach"} \\by Peter Norvig and Stuart Russell};        
    % copyright
	\node[text width=3cm] at (3,-6.25) {\begin{tiny}Copyright \textcopyright Alfonso R. Reyes, 2020\end{tiny}};

\end{tikzpicture}  
\end{document}

ai-artificial_intelligence_jmccarthy_arr.tex

% Branches of Artificial Intelligence
% Drawn by Alfonso R. Reyes
% November 27, 2020
% Personal interpretation of "What is AI? / Branches of AI" article by Prof. John McCarthy.
% Original diagram: https://github.com/FriendlyUser/LatexDiagrams
\documentclass[border=5pt]{standalone}
\usepackage{xcolor}
\usepackage{ulem}


\definecolor{ocre}{HTML}{800000}
\definecolor{sky}{HTML}{C6D9F1}
\definecolor{skybox}{HTML}{5F86B3}

\usepackage{tikz}
\usepackage{pgfmath}
\usetikzlibrary{decorations.text, arrows.meta,calc,shadows.blur,shadings}

\renewcommand*\familydefault{\sfdefault} % Set font to serif family

% arctext from Andrew code with modifications:
%Variables: 1: ID, 2:Style 3:box height 4: Radious 5:start-angl 6:end-angl 7:text {format along path} 
\def\arctext[#1][#2][#3](#4)(#5)(#6)#7{
	\draw[#2] (#5:#4cm+#3) coordinate (above #1) arc (#5:#6:#4cm+#3)
	             -- (#6:#4) coordinate (right #1) -- (#6:#4cm-#3) coordinate (below right #1) arc (#6:#5:#4cm-#3) coordinate (below #1)
	             -- (#5:#4) coordinate (left #1) -- cycle;
	            \def\a#1{#4cm+#3}
	            \def\b#1{#4cm-#3}
	\path[
	    decoration={
	        raise = -0.5ex, % Controls relavite text height position.
	        text  along path,
	        text = {#7},
	        text align = center,        
	    },
	    decorate
	    ]
	    (#5:#4) arc (#5:#6:#4);
}

% arcarrow, this is mine, for beerware purpose...
% Function: Draw an arrow from arctex coordinate specific nodes to another 
% Arrow start at the start of arctext box and could be shifted to change the position
% to avoid go over another box.
% Var: 1:Start coordinate 2:End coordinate 3:angle to shift from acrtext box  
\def\arcarrow(#1)(#2)[#3]{
    \draw[very thick,->,>=latex,black!60] 
        let \p1 = (#1), \p2 = (#2), % To access cartesian coordinates x, and y.
            \n1 = {veclen(\x1,\y1)}, % Distance from the origin
            \n2 = {veclen(\x2,\y2)}, % Distance from the origin
            \n3 = {atan2(\y1,\x1)} % Angle where acrtext starts.
        in (\n3-#3: \n1) -- (\n3-#3: \n2); % Draw the arrow.
}


\begin{document}
\begin{tikzpicture}[
	    % Environment Cfg
	    font=\sf    \scriptsize,
	    % Styles
	    myarrow/.style={
	        thick,
	        -latex,
            black!60,
	    },
	    Center/.style ={
	        circle,
	        fill=ocre,
	        text=white,
	        align=center,
	        font =\footnotesize\bf,
	        inner sep=1pt,          
	    },
	    RedArc/.style ={
	        color=black,
	        thick,
	        fill=ocre,
	        blur shadow, 
	    },
	    SkyArc/.style ={
	        color=skybox,
	        thick,
	        fill=sky,
	        blur shadow, 
	    },
    ]

    % Drawing the center for AI
    \node[Center](AI) at (0,0) { Artificial \\ Intelligence \\(AI)\\ Agent};
    \coordinate (AROUND) at (0:1.2); 

    % Drawing the Text Arcs
    % Format: \Arctext[ID][box-style][box-height](radious)(start-angl)(end-angl){|text-styles| Text}
   
	% Logic
    \arctext[LOGI][RedArc][8pt](2.5)(120)(70){|\footnotesize\bf\color{white}| Logic};
	\arcarrow(below LOGI)(AROUND)[25];
    
    % Search
    \arctext[SRCH][RedArc][8pt](2.5)(60)(20){|\footnotesize\bf\color{white}| Search};
	\arcarrow(below SRCH)(AROUND)[20];
	   
	% Pattern Recognition
	\arctext[RECO][RedArc][8pt](2.5)(-60)(10){|\footnotesize\bf\color{white}| Pattern Recognition};
	\arcarrow(below RECO)(AROUND)[-35];

    % Representation
    \arctext[REPR][RedArc][8pt](2.5)(240)(290){|\footnotesize\bf\color{white}| Representation};
	\arcarrow(below REPR)(AROUND)[-25];
    
    % Inference
    \arctext[INFE][RedArc][8pt](2.5)(190)(230){|\footnotesize\bf\color{white} | Inference};    
    \arcarrow(below INFE)(AROUND)[-20];
    
    % Reasoning
    \arctext[REAS][RedArc][8pt](2.5)(180)(130){|\footnotesize\bf\color{white} | Reasoning};
	\arcarrow(below REAS)(AROUND)[25];
        
	% Epistemology
    \arctext[EPIS][RedArc][8pt](3.30)(220)(260){|\footnotesize\bf\color{white}|  Epistemology};

	% Planning
    \arctext[PLAN][RedArc][8pt](3.30)(210)(160){|\footnotesize\bf\color{white}| Planning};  
    
    % Learning
    \arctext[LEAR][RedArc][8pt](3.30)(150)(110){|\footnotesize\bf\color{white}| Learning};  

	% Ontology
    \arctext[ONTO][RedArc][8pt](3.30)(90)(50){|\footnotesize\bf\color{white}| Ontology};  
    
    % Heuristics
    \arctext[HEUR][RedArc][8pt](3.30)(40)(-10){|\footnotesize\bf\color{white}| Heuristics};  

	% Genetic Programming
	\arctext[GENE][RedArc][8pt](3.30)(270)(330){|\footnotesize\bf\color{white}| Genetic Programming};  
	

%    %ADITIONAL EXTERNAL ARC
%   \arctext[NEW][
%       color=white,
%       shade,      
%       upper left=gray!7,
%       upper right=gray!7,
%       lower left=gray!7,
%       lower right=gray!7,
%       rounded corners = 8pt
%       ][8pt](5.2)(180)(0){|\footnotesize\bf\color{black}| Interpration of "What is AI? / Branches of AI" article by Prof. John McCarthy.};

    % Drawing the Arrows from contributing branch to AI
    % Format: \arcarrow(above/below ID)(abobe/below ID)[shift]
    \arcarrow(below LEAR)(AROUND)[25];
    \arcarrow(below ONTO)(AROUND)[25];
    \arcarrow(below HEUR)(AROUND)[25];
    \arcarrow(below GENE)(AROUND)[-25];
    \arcarrow(below EPIS)(AROUND)[-15];
    \arcarrow(below PLAN)(AROUND)[25];
       

	% Legend and labels
    \draw[myarrow] (-5,-5) coordinate (legend) -- ++(.8,0) node[anchor=west] {(contribution)};
    \draw[RedArc] (legend)++(0,-0.4) rectangle ++(.8,-.3)++(0,.2) node[anchor=west, text width=3em] {capabilities,\\disciplines};
    \draw[SkyArc] (legend)++(0,-1) rectangle ++(.8,-.3)++(0,.2) node[anchor=west, color=black] {subfield};
    % source, book and authors
    \node [text width=5.5cm] at (1,-5.6) {Source: \textit {"What is AI? / Branches of AI"} article by Prof. John McCarthy. Stanford University.};
    % copyright
	\node[text width=3cm] at (3.25,-6.25) {\begin{tiny}Copyright \textcopyright Alfonso R. Reyes, 2020\end{tiny}};

\end{tikzpicture}  
\end{document}

ai-computational_intelligence-pool,mackworth_arr.tex

% Computational Intelligence Agent Contributors
% Drawn by Alfonso R. Reyes
% November 2020
% Personal interpretation of "Computational Intelligence: A Logical Approach" by David Poole, Alan Mackworth and Randy Goebel.
% Original diagram: https://github.com/FriendlyUser/LatexDiagrams
\documentclass[border=5pt]{standalone}
\usepackage{xcolor}

	\definecolor{ocre}{HTML}{800000}
	\definecolor{sky}{HTML}{C6D9F1}
	\definecolor{skybox}{HTML}{5F86B3}

\usepackage{tikz}
\usepackage{pgfmath}
\usetikzlibrary{decorations.text, arrows.meta,calc,shadows.blur,shadings}

\renewcommand*\familydefault{\sfdefault} % Set font to serif family

% arctext from Andrew code with modifications:
%Variables: 1: ID, 2:Style 3:box height 4: Radious 5:start-angl 6:end-angl 7:text {format along path} 
\def\arctext[#1][#2][#3](#4)(#5)(#6)#7{

\draw[#2] (#5:#4cm+#3) coordinate (above #1) arc (#5:#6:#4cm+#3)
             -- (#6:#4) coordinate (right #1) -- (#6:#4cm-#3) coordinate (below right #1) arc (#6:#5:#4cm-#3) coordinate (below #1)
             -- (#5:#4) coordinate (left #1) -- cycle;
            \def\a#1{#4cm+#3}
            \def\b#1{#4cm-#3}
\path[
    decoration={
        raise = -0.5ex, % Controls relavite text height position.
        text  along path,
        text = {#7},
        text align = center,        
    },
    decorate
    ]
    (#5:#4) arc (#5:#6:#4);
}

% arcarrow, this is mine, for beerware purpose...
% Function: Draw an arrow from arctex coordinate specific nodes to another 
% Arrow start at the start of arctext box and could be shifted to change the position
% to avoid go over another box.
% Var: 1:Start coordinate 2:End coordinate 3:angle to shift from acrtext box  
\def\arcarrow(#1)(#2)[#3]{
    \draw[very thick,->,>=latex,black!60] 
        let \p1 = (#1), \p2 = (#2), % To access cartesian coordinates x, and y.
            \n1 = {veclen(\x1,\y1)}, % Distance from the origin
            \n2 = {veclen(\x2,\y2)}, % Distance from the origin
            \n3 = {atan2(\y1,\x1)} % Angle where acrtext starts.
        in (\n3-#3: \n1) -- (\n3-#3: \n2); % Draw the arrow.
}


\begin{document}
\begin{tikzpicture}[
	    % Environment Cfg
	    font=\sf    \scriptsize,
	    % Styles
	    myarrow/.style={
	        very thick,
	        -latex,
            black!60,
	    },
	    Center/.style ={
	        circle,
	        fill=ocre,
	        text=white,
	        align=center,
	        font =\footnotesize\bf,
	        inner sep=1pt,          
	    },
	    RedArc/.style ={
	        color=black,
	        thick,
	        fill=ocre,
	        blur shadow, 
	    },
	    SkyArc/.style ={
	        color=skybox,
	        thick,
	        fill=sky,
	        blur shadow, 
	    },
    ]

    % Drawing the center for AI
    \node[Center](AI) at (0,0) { Computational \\ Intelligence \\(AI)\\ Agent};
    \coordinate (AROUND) at (0:1.2); 

    % Drawing the Text Arcs
    % Format: \Arctext[ID][box-style][box-height](radious)(start-angl)(end-angl){|text-styles| Text}
    
	% Machine Learning
    \arctext[ML][RedArc][8pt](2.75)(135)(85){|\footnotesize\bf\color{white}| Machine Learning};
    \arctext[REIN][SkyArc][5pt](3.50)(135)(85){|\scriptsize\color{black}| Decision Trees};
    \arctext[KNOW][SkyArc][5pt](4.00)(135)(85){|\scriptsize| Neural Networks};
%    \arctext[SUPL][SkyArc][5pt](4.00)(140)(115){|\scriptsize| Supervised L.};
    \arctext[PROB][SkyArc][5pt](4.50)(135)(85){|\scriptsize\color{black}| Explanation Based Learning};
    
    % Problem Solving
    \arctext[SOLV][RedArc][8pt](2.75)(80)(40){|\footnotesize\bf\color{white}| Searching};
    \arctext[SRCH][SkyArc][5pt](3.50)(80)(40){|\scriptsize\color{black}| Graph Searching };
    \arctext[HEUR][SkyArc][5pt](4.00)(80)(40){|\scriptsize| Heuristic Search};
	\arctext[CONST][SkyArc][5pt](4.50)(80)(40){|\scriptsize\color{black}| Constraint Satisfaction};
	
	% Natural Language Processing
    \arctext[NLP][RedArc][8pt](2.75)(35)(-20){|\footnotesize\bf\color{white}| Definite Knowledge};
    \arctext[TRAN][SkyArc][5pt](3.50)(35)(5){|\scriptsize\color{black}| Recursion};
    \arctext[TRAN][SkyArc][5pt](3.50)(0)(-20){|\scriptsize\color{black}| NLP};
    \arctext[SPER][SkyArc][5pt](4.00)(35)(-20){|\scriptsize| Grammar Augmentation};
    \arctext[INFX][SkyArc][5pt](4.50)(35)(-20){|\scriptsize\color{black}| First Order Predicate Calculus};

    % Decision Making
    \arctext[DEC][RedArc][8pt](2.75)(290)(335){|\footnotesize\bf\color{white}| Planning};
    \arctext[LOG][SkyArc][5pt](3.50)(290)(335){|\scriptsize\color{black}| Time Representation};
    \arctext[KNOW][SkyArc][5pt](4.00)(290)(335){|\scriptsize| World Representations};
    \arctext[PLAN][SkyArc][5pt](4.50)(290)(335){|\scriptsize| Forward Planning};
    
    % Reasoning
    \arctext[REAS][RedArc][8pt](2.75)(250)(285){|\footnotesize\bf\color{white}|  Reasoning};
    \arctext[PROB][SkyArc][5pt](3.50)(250)(285){|\scriptsize\color{black}| Semantics};
    \arctext[REAT][SkyArc][5pt](4.00)(249)(287){|\scriptsize| Symbolic Representation};
    \arctext[UNQU][SkyArc][5pt](4.50)(248)(287){|\scriptsize\color{black}| Clauses, Questions, Answers};
    
    % Robotics
    \arctext[ROB][RedArc][8pt](2.75)(200)(245){|\footnotesize\bf\color{white}|  Robotics};
    \arctext[RPER][SkyArc][5pt](3.50)(200)(245){|\scriptsize\color{black}| Agent Functions};
    \arctext[RACT][SkyArc][5pt](4.00)(200)(245){|\scriptsize| Robotic Systems};
    \arctext[MAPL][SkyArc][5pt](4.50)(200)(224){|\scriptsize\color{black}| Agent Models};
    \arctext[MAPL][SkyArc][5pt](4.50)(226)(245){|\scriptsize\color{black}| Architecture};
    
    % Object Recognition
    \arctext[RECO][RedArc][8pt](2.75)(140)(195){|\footnotesize\bf\color{white}| Knowledge};
    \arctext[VIS][SkyArc][5pt](3.50)(140)(195){|\scriptsize\color{black}| Representation Language};
    \arctext[IMGP][SkyArc][5pt](4.00)(140)(195){|\scriptsize\color{black}| Map Problem to Representation };
    \arctext[MOTC][SkyArc][5pt](4.50)(140)(195){|\scriptsize\color{black}| Knowledge Based Systems};   
  

%    %ADITIONAL EXTERNAL ARC
%    \arctext[NEW][
%        color=white,
%        shade,      
%        upper left=gray,
%        upper right=black!50,
%        lower left=gray,
%        lower right=gray!50,
%        rounded corners = 8pt
%        ][8pt](5.2)(180)(0){|\footnotesize\bf\color{white}| "Computational Intelligence: A Logical Approach" by David Poole, Alan Mackworth and Randy Goebel};

    % Drawing the Arrows from contributing branch to AI
    % Format: \arcarrow(above/below ID)(abobe/below ID)[shift]
    \arcarrow(below ML)(AROUND)[30];
    \arcarrow(below SOLV)(AROUND)[24];
    \arcarrow(below NLP)(AROUND)[15];
    \arcarrow(below DEC)(AROUND)[-25];
    \arcarrow(below REAS)(AROUND)[-17];
    \arcarrow(below ROB)(AROUND)[-19];
    \arcarrow(below RECO)(AROUND)[-33];

    % Same level Arrows. Not needed now
    % \draw[myarrow] (left SSNX) -- (right DUAM);
    % \draw[myarrow] (left ML) -- (left SRel);
    % \draw[myarrow] (left SCap) -- (right ML);

	% Color Legend and labels
    \draw [myarrow] (-5,-5) coordinate (legend) -- ++(.8,0) node[anchor=west] {(contribution)};
    \draw [RedArc] (legend)++(0,-0.4) rectangle ++(.8,-.3)++(0,.2) node [anchor=west, text width=3em] {capabilities,\\disciplines};
    \draw [SkyArc] (legend)++(0,-1) rectangle ++(.8,-.3)++(0,.2) node[anchor=west, color=black] {subfield};
    % source, book and authors
    \node [text width=6.45cm] at (1,-5.6) {Source: \textit {"Computational Intelligence: A Logical Approach"} \\by David Poole, Alan Mackworth and Randy Goebel};
    % copyright
	\node [text width=3cm] at (3.25,-6.25) {\begin{tiny}Copyright \textcopyright Alfonso R. Reyes, 2020\end{tiny}};

\end{tikzpicture}  
\end{document}

animation-dynamic_labels.tex

% https://tex.stackexchange.com/a/347917/173708

\documentclass[tikz]{standalone}

\usepackage{verbatim}

\begin{comment}
This example is a demonstration of an animation by creating a GIF file out of
a PDF file with several pages. Once the PDF file has been created with the 
"pgfmathsetmacro" macor, convert the PDF file to a GIF. 
Create the gif with:

  convert -delay 0 -density 120 animation-dynamic_labels.pdf animation-dynamic_labels.gif

\end{comment}  

\begin{document}
% this will produce the animation by creating 80 small PDF files
% later we will need to build the GIF file
\foreach {\tangle} in {80,79,...,10}{
  \pgfmathsetmacro{\sangle}{-\tangle}

\begin{tikzpicture}[auto]
    % constants
    \def\rinn{2}
    \def\rout{3.8}

    % just to fix the global bounding box
    \path circle[radius=\rout cm+5mm+2em];

    \draw (0,0) circle [radius=\rinn];
    \draw (0,0) circle [radius=\rout];

    \coordinate (T1) at (\tangle:\rinn);
    \coordinate (T2) at (\tangle:\rout);
    \coordinate (S1) at (\sangle:\rinn);
    \coordinate (S2) at (\sangle:\rout);

    \draw (0,0) -- (T1) -- (T2);
    \draw (0,0) -- (S1) -- (S2);

    \path (T1) ++(\tangle+45:5mm) node{T1};
    \path (T2) ++(\tangle+45:5mm) node{T2};
    \path (S1) ++(\sangle-45:5mm) node{S1};
    \path (S2) ++(\sangle-45:5mm) node{S2};

\end{tikzpicture}
}
\end{document}

box_arrows+diagram.tex

% https://tex.stackexchange.com/a/52766/173708
\documentclass{standalone}

\usepackage{tikz}
\usetikzlibrary{shapes,positioning,arrows,calc}

\begin{document}

\begin{tikzpicture}[stack/.style={
  rectangle split, rectangle split parts=5, draw, anchor=center},
  myarrow/.style={single arrow, draw=none}]

  \node [stack] (ini)  {$a=0$\nodepart{two}$b=10$%
    \nodepart{three}$c=100$\nodepart{four}$d=-10$\nodepart{five}$\cdots$};

  \node [draw,rectangle,align=left,right=of ini,label=above:{Computer Program}] (mid)
    {instruction 0;\\ instruction 1;\\$\ldots$\\instruction $n$;};

  \node [stack,right=of mid] (fin) {$a=10$\nodepart{two}$b=100$%
    \nodepart{three}$c=-10$\nodepart{four}$d=110$\nodepart{five}$\cdots$};

  \node [above=of ini,anchor=north,align=left] {Initial values of\\variables};
  \node [above=of fin,anchor=north,align=left] {Final values of\\variables};

  \node [myarrow,draw,anchor=west] at ($(ini.east)+(2.5pt,0)$) {\phantom{te}} ;
  \node [myarrow,draw,anchor=west] at ($(mid.east)+(2.5pt,0)$) {\phantom{te}} ;

\end{tikzpicture}

\end{document}

circle_custom_with_arcs+symbol+geometry.tex

% https://tex.stackexchange.com/questions/33150/creating-node-shapes?rq=1
\documentclass[border=10pt]{standalone}

\usepackage{tikz}

\makeatletter
\tikzset{arc style/.initial={}}
\pgfdeclareshape{circle with arcs}{
    \inheritsavedanchors[from=circle]
    \inheritanchorborder[from=circle]

    \inheritanchor[from=circle]{center}
    \inheritanchor[from=circle]{south}
    \inheritanchor[from=circle]{west}
    \inheritanchor[from=circle]{north}
    \inheritanchor[from=circle]{east}
    % etc.

    \inheritbackgroundpath[from=circle]

    \beforebackgroundpath{
        % get and set options
        \pgfkeys{/tikz/arc style/.get=\tmp}
        \expandafter\tikzset\expandafter{\tmp}
        \tikz@options

        % get radius length and center coordinates
        \radius \pgf@xa=\pgf@x
        \centerpoint \pgf@xb=\pgf@x \pgf@yb=\pgf@y

        % draw arc starting from north
        \advance\pgf@yb by\pgf@xa
        \pgfpathmoveto{\pgfpoint{\pgf@xb}{\pgf@yb}}
        \pgfpatharc{180}{270}{\pgf@xa}

        % draw arc starting from south
        \advance\pgf@yb by -2\pgf@xa
        \pgfpathmoveto{\pgfpoint{\pgf@xb}{\pgf@yb}}
        \pgfpatharc{0}{90}{\pgf@xa}

        \pgfusepath{draw}
    }
}
\makeatother

\begin{document}
\begin{tikzpicture}
    \draw[help lines, gray, dotted] (-2,-2) grid (2,2);
    \node[
        circle with arcs,
        draw=gray,
        fill=blue!20,
        minimum width=2cm,
        arc style={black,thick}
        ] (c) {1};
    \draw[thick,gray,dotted]
        (c.north) -- +(0,1)
        (c.east)  -- +(1,0)
        (c.south) -- +(0,-1)
        (c.west)  -- +(-1,0);
\end{tikzpicture}
\end{document}

class_diagram+diagram.tex

% Class diagram
% Author: Remus Mihail Prunescu

% arr: change colors. 
\documentclass{minimal}
\usepackage[a4paper,margin=1cm,landscape]{geometry}
\usepackage{tikz}

%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>

\begin{comment}
:Title:  Class diagram

\end{comment}

\usetikzlibrary{positioning,shapes,shadows,arrows}

\begin{document}
\tikzstyle{abstract}=[rectangle, draw=black, rounded corners, fill=black!40!blue!60, drop shadow,
        text centered, anchor=north, text=white, text width=3cm]
\tikzstyle{comment}=[rectangle, draw=black, rounded corners, fill=black!60!green, drop shadow,
        text centered, anchor=north, text=white, text width=3cm]
\tikzstyle{myarrow}=[->, >=open triangle 90, thick]
\tikzstyle{line}=[-, thick]
        
\begin{center}
\begin{tikzpicture}[node distance=2cm]
    \node (Item) [abstract, rectangle split, rectangle split parts=2]
        {
            \textbf{ITEM}
            \nodepart{second}name
        };
    \node (AuxNode01) [text width=4cm, below=of Item] {};
    \node (Component) [abstract, rectangle split, rectangle split parts=2, left=of AuxNode01]
        {
            \textbf{COMPONENT}
            \nodepart{second}nil
        };
    \node (System) [abstract, rectangle split, rectangle split parts=2, right=of AuxNode01]
        {
            \textbf{SYSTEM}
            \nodepart{second}parts
        };
    \node (AuxNode02) [text width=0.5cm, below=of Component] {};
    \node (Sensor) [abstract, rectangle split, rectangle split parts=2, left=of AuxNode02]
        {
            \textbf{SENSOR}
            \nodepart{second}nil
        };
    \node (Part) [abstract, rectangle split, rectangle split parts=2, right=of AuxNode02]
        {
            \textbf{PART}
            \nodepart{second}nil
        };
        
    \node (AuxNode03) [below=of Sensor] {};
    \node (Pressure) [abstract, rectangle split, rectangle split parts=2, left=of AuxNode03, xshift=2cm]
        {
            \textbf{Pressure}
            \nodepart{second}nil
        };
    \node (Temperature) [abstract, rectangle split, rectangle split parts=2, right=of AuxNode03, xshift=-2cm]
        {
            \textbf{Temperature}
            \nodepart{second}nil
        };
    \node (PressureInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of Pressure, text justified]
        {
            \textbf{Instants}
            \nodepart{second}fw-p-suction\newline fw-p-delivery\newline fw-p-loop\newline sw-p-suction\newline sw-p-delivery
                \newline sw-p-loop
        };
    \node (ClOp) [abstract, rectangle split, rectangle split parts=2, below=0.4cm of PressureInstants]
        {
            \textbf{Closed/Open}
            \nodepart{second}nil
        };
    \node (ClOpInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of ClOp, text justified]
        {
            \textbf{Instants}
            \nodepart{second}fw-clop-warm-up\newline sw-clop-control
        };
    \node (TemperatureInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of Temperature, text justified]
        {
            \textbf{Instants}
            \nodepart{second}fw-t-engine\newline fw-t-heat-exch.\newline sw-t-heat-exch.
        };
    \node (Level) [abstract, rectangle split, rectangle split parts=2, below=0.4cm of TemperatureInstants]
        {
            \textbf{Level}
            \nodepart{second}nil
        };
    \node (LevelInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of Level, text justified]
        {
            \textbf{Instants}
            \nodepart{second}fw-l-tank
        };
    \node (Ammeter) [abstract, rectangle split, rectangle split parts=2, below=0.4cm of LevelInstants]
        {
            \textbf{Ammeter}
            \nodepart{second}nil
        };
    \node (AmmeterInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of Ammeter, text justified]
        {
            \textbf{Instants}
            \nodepart{second}fw-pump-ammeter\newline sw-pump-ammeter
        };
        
    \node (AuxNode04) [below=of Part] {};
    \node (Pump) [abstract, rectangle split, rectangle split parts=2, left=of AuxNode04, xshift=2cm]
        {
            \textbf{Pump}
            \nodepart{second}nil
        };
    \node (Valve) [abstract, rectangle split, rectangle split parts=2, right=of AuxNode04, xshift=-2cm]
        {
            \textbf{Valve}
            \nodepart{second}nil
        };
    \node (PumpInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of Pump, text justified]
        {
            \textbf{Instants}
            \nodepart{second}fw-pump\newline sw-pump
        };
    \node (Tank) [abstract, rectangle split, rectangle split parts=2, below=0.4cm of PumpInstants]
        {
            \textbf{Tank}
            \nodepart{second}nil
        };
    \node (ValveInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of Valve, text justified]
        {
            \textbf{Instants}
            \nodepart{second}fw-suction-valve\newline fw-delivery-valve\newline sw-suction-valve\newline sw-delivery-valve
                \newline sw-discharge-valve\newline sw-control-valve
        };
    \node (Engine) [abstract, rectangle split, rectangle split parts=2, below=0.4cm of ValveInstants]
        {
            \textbf{Engine}
            \nodepart{second}nil
        };
    \node (TankInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of Tank, text justified]
        {
            \textbf{Instants}
            \nodepart{second}fw-expansion-tank
        };
    \node (HeatExchanger) [abstract, rectangle split, rectangle split parts=2, below=0.4cm of TankInstants]
        {
            \textbf{Heat Exchanger}
            \nodepart{second}nil
        };
    \node (HeatExchangerInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of HeatExchanger, text justified]
        {
            \textbf{Instants}
            \nodepart{second}fw-heat-exchanger
        };
    \node (EngineInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of Engine, text justified]
        {
            \textbf{Instants}
            \nodepart{second}fw-engine
        };
    \node (Strainer) [abstract, rectangle split, rectangle split parts=2, below=0.4cm of HeatExchangerInstants]
        {
            \textbf{Strainer}
            \nodepart{second}nil
        };
    \node (StrainerInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of Strainer, text justified]
        {
            \textbf{Instants}
            \nodepart{second}sw-strainer
        };
    \node (Coolant) [abstract, rectangle split, rectangle split parts=2, below=0.4cm of EngineInstants]
        {
            \textbf{Coolant}
            \nodepart{second}nil
        };
    \node (CoolantInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of Coolant, text justified]
        {
            \textbf{Instants}
            \nodepart{second}fw-coolant\newline sw-coolant
        };  

    \node (AuxNode05) [below=of System] {};
    \node (CoolingSystem) [abstract, rectangle split, rectangle split parts=2, left=of AuxNode05, xshift=2cm]
        {
            \textbf{Cooling System}
            \nodepart{second}nil
        };
    \node (CoolingLoop) [abstract, rectangle split, rectangle split parts=2, right=of AuxNode05, xshift=-2cm]
        {
            \textbf{Cooling Loop}
            \nodepart{second}nil
        };
    \node (CoolingSystemInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of CoolingSystem, text justified]
        {
            \textbf{Instants}
            \nodepart{second}cool
        };
    \node (CoolingLoopInstants) [comment, rectangle split, rectangle split parts=2, below=0.2cm of CoolingLoop, text justified]
        {
            \textbf{Instants}
            \nodepart{second}fw-loop\newline sw-loop
        };
    
    \draw[myarrow] (Component.north) -- ++(0,0.8) -| (Item.south);
    \draw[line] (Component.north) -- ++(0,0.8) -| (System.north);
    
    \draw[myarrow] (Sensor.north) -- ++(0,0.8) -| (Component.south);
    \draw[line] (Sensor.north) -- ++(0,0.8) -| (Part.north);
    
    \draw[line] (Pressure.west) -- ++(-0.2,0);
    \draw[line] (Temperature.east) -- ++(0.2,0);
    \draw[line] (Level.east) -- ++(0.2,0);
    \draw[myarrow] (ClOp.west) -- ++(-0.2,0) -- ([yshift=0.5cm, xshift=-0.2cm] Pressure.north west) -|
     ([xshift=-1cm]Sensor.south);
    \draw[myarrow] (Ammeter.east) -- ++(0.2,0) -- ([yshift=0.5cm, xshift=0.2cm] Temperature.north east) -|
     ([xshift=1cm]Sensor.south);
     
    \draw[line] (Tank.west) -- ++(-0.2,0);
    \draw[line] (HeatExchanger.west) -- ++(-0.2,0);
    \draw[line] (Pump.west) -- ++(-0.2,0);
    \draw[line] (Valve.east) -- ++(0.2,0);
    \draw[line] (Engine.east) -- ++(0.2,0);
    \draw[myarrow] (Strainer.west) -- ++(-0.2,0) -- ([yshift=0.5cm, xshift=-0.2cm] Pump.north west) -|
     ([xshift=-1cm]Part.south);
    \draw[myarrow] (Coolant.east) -- ++(0.2,0) -- ([yshift=0.5cm, xshift=0.2cm] Valve.north east) -|
     ([xshift=1cm]Part.south);
     
    \draw[myarrow] (CoolingSystem.north) -- ++(0,0.8) -| (System.south);
    \draw[line] (CoolingSystem.north) -- ++(0,0.8) -| (CoolingLoop.north);
        
        
\end{tikzpicture}
\end{center}
\end{document}

colorized_equation+equation.tex

% https://www.overleaf.com/read/cvmtqywqgvvw#/43203532/
% https://betterexplained.com/articles/colorized-math-equations/

% \documentclass{article}
\documentclass[preview]{standalone}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{color}

\newcommand{\plain}{\color{black}}
\newcommand{\Frac}[2]{\genfrac{}{}{1pt}{}{#1}{#2}}	% thicker fraction line

\definecolor{c1}{RGB}{114,0,172}   % primary
\definecolor{c2}{RGB}{45,177,93}   % true
\definecolor{c3}{RGB}{251,0,29}    % false
\definecolor{c4}{RGB}{18,110,213}  % secondary
\definecolor{c5}{RGB}{255,160,109} % tertiary
\definecolor{c6}{RGB}{219,78,158}  % alt-primary 

\renewcommand{\familydefault}{\sfdefault}

\begin{document}
\begin{center}

\newcommand{\growth}{\color{c1}}
\newcommand{\unitQuantity}{\color{c2}}
\newcommand{\unitInterest}{\color{c3}}
\newcommand{\unitTime}{\color{c4}}
\newcommand{\perfectly}{\color{c5}}
\newcommand{\compounded}{\color{c6}}

$$\growth e
\plain =
\perfectly \lim_{n\to\infty}
\plain \left(
\unitQuantity 1 + \unitInterest \frac{1}{\compounded n}
\plain \right)
\unitTime^{1 \cdot \compounded n}
$$

\growth       The base for continuous growth
\plain        is
\\
\unitQuantity the unit quantity 
\unitInterest earning unit interest
\unitTime     for unit time, 
\\
\compounded   compounded
\perfectly    as fast as possible

\end{center}
\end{document}

cubes_factorials+physics+3d.tex

% include TIKZ_PREAMBLE.pgs
\documentclass[parskip]{scrartcl}

\usepackage{tikz}
\usepackage{pgfplots}

\begin{document}

\tikzset{
  vertex/.style={
    circle, minimum size=20pt, inner sep=0pt, fill=gray!10},
  axial/.style={
    rectangle, minimum size=20pt, inner sep=0pt, fill=gray!30},
  edge/.style={draw,thick,-,black},
  rotu/.style={midway},
  sinal/.style={draw, circle, inner sep=0pt, thin}
}

\def\dist{0.4}
\begin{tikzpicture}[
  scale=2, ->, thick, z={(0.45,0.35)}, node distance=0.65cm]
  \node[vertex] (v0) at (0,0,0) {$(1)$};
  \node[vertex] (v1) at (0,1,0) {$b$};
  \node[vertex] (v2) at (1,0,0) {$a$};
  \node[vertex] (v3) at (1,1,0) {$ab$};
  \node[vertex] (v4) at (0,0,1) {$c$};
  \node[vertex] (v5) at (0,1,1) {$bc$};
  \node[vertex] (v6) at (1,0,1) {$ac$};
  \node[vertex] (v7) at (1,1,1) {$abc$};
  \draw[edge] (v0) -- (v1) node[rotu, left=\dist] {$B$} -- 
    (v3) -- (v2) -- (v0) node[rotu, below=\dist] {$A$};
  \draw[edge] (v0) -- (v4) -- (v5) -- (v1);
  \draw[edge] (v2) -- (v6)
    node[rotu, below right=\dist] {$C$} -- (v7) -- (v3);
  \draw[edge] (v4) -- (v6); \draw[edge] (v5) -- (v7);
  \node[sinal, below of=v0] {$-$};
  \node[sinal, left of=v0] {$-$};
  \node[sinal, left of=v1] {$+$};
  \node[sinal, below of=v2] {$+$};
  \node[sinal, right of=v3] {$-$};
  \node[sinal, right of=v7] {$+$};
\end{tikzpicture}

\def\dist{0.4}
\def\ax{2}
\begin{tikzpicture}[
  scale=2, ->, thick, z={(0.55,0.3)}, node distance=0.65cm]
  \node[vertex, fill=yellow] (c0) at (0,0,0) {$0$};
  \node[vertex] (v0) at (-1,-1,-1) {$(1)$};
  \node[vertex] (v1) at (-1,1,-1) {$b$};
  \node[vertex] (v2) at (1,-1,-1) {$a$};
  \node[vertex] (v3) at (1,1,-1) {$ab$};
  \node[vertex] (v4) at (-1,-1,1) {$c$};
  \node[vertex] (v5) at (-1,1,1) {$bc$};
  \node[vertex] (v6) at (1,-1,1) {$ac$};
  \node[vertex] (v7) at (1,1,1) {$abc$};
  \node[axial] (a1) at (-\ax,0,0) {$W$};
  \node[axial] (a2) at (\ax,0,0) {$W$};
  \node[axial] (a3) at (0,-\ax,0) {$W$};
  \node[axial] (a4) at (0,\ax,0) {$W$};
  \node[axial] (a5) at (0,0,-\ax) {$W$};
  \node[axial] (a6) at (0,0,\ax) {$W$};
  \draw[edge] (v0) -- (v1) node[rotu, left=\dist] {$B$} -- 
    (v3) -- (v2) -- (v0) node[rotu, below=\dist] {$A$};
  \draw[edge] (v0) -- (v4) -- (v5) -- (v1);
  \draw[edge] (v2) -- (v6)
    node[rotu, below right=\dist] {$C$} -- (v7) -- (v3);
  \draw[edge] (v4) -- (v6); \draw[edge] (v5) -- (v7);
  \draw[edge] (a1) -- (c0) --(a2);
  \draw[edge] (a3) -- (c0) --(a4);
  \draw[edge] (a5) -- (c0) --(a6);
  \node[sinal, below of=v0] {$-$};
  \node[sinal, left of=v0] {$-$};
  \node[sinal, left of=v1] {$+$};
  \node[sinal, below of=v2] {$+$};
  \node[sinal, right of=v3] {$-$};
  \node[sinal, right of=v7] {$+$};
\end{tikzpicture}

\begin{tikzpicture}[
  scale=2, ->, thick, z={(0.45,0.35)}, node distance=0.65cm,
  vertex/.style={
    rectangle, minimum size=12pt, inner sep=1pt, fill=gray!10
  }]
  \node[text centered] (title) at (0.7,1.7,0)
    {Rendimento (\%) em um $2^3$};
  \node[vertex] (v0) at (0,0,0) {$54.8$};
  \node[vertex] (v1) at (0,1,0) {$48.0$};
  \node[vertex] (v2) at (1,0,0) {$86.5$};
  \node[vertex] (v3) at (1,1,0) {$63.0$};
  \node[vertex] (v4) at (0,0,1) {$63.0$};
  \node[vertex] (v5) at (0,1,1) {$58.5$};
  \node[vertex] (v6) at (1,0,1) {$93.5$};
  \node[vertex] (v7) at (1,1,1) {$72.0$};
  \draw[edge] (v0) -- (v1)
    node[rotu, rotate=90, yshift=1.2cm] {Catalizador} -- 
    (v3) -- (v2) -- (v0) node[rotu, below=0.9cm] {Temperatura};
  \draw[edge] (v0) -- (v4) -- (v5) -- (v1);
  \draw[edge] (v2) -- (v6)
    node[rotu, rotate=40, yshift=-1cm, xshift=0.5cm]
    {Concentra\c{c}\~ao} -- (v7) -- (v3);
  \draw[edge] (v4) -- (v6); \draw[edge] (v5) -- (v7);
  \node[sinal, below of=v0] {$-$};
  \node[sinal, left of=v0] {$-$};
  \node[sinal, left of=v1] {$+$};
  \node[sinal, below of=v2] {$+$};
  \node[sinal, right of=v3] {$-$};
  \node[sinal, right of=v7] {$+$};
\end{tikzpicture}


\end{document}

custom-use_library+symbol+pkg.tex

% https://tex.stackexchange.com/a/247338/173708
% https://tex.stackexchange.com/questions/247202/creating-tikz-libraries?noredirect=1&lq=1
% calls tikzlibraryunitscircle.code.tex
\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc}
\usetikzlibrary{unitcircle}   % using  tikzlibraryunitcircle.code.tex
\begin{document}

\begin{tikzpicture}

  \path
              (0,0) pic (LL) {quadrant III}
        -- ++ (1,0) pic (LR) {quadrant IV}
        -- ++ (0,1) pic (UR) {quadrant I}
        -- cycle
        -- ++ (0,1) pic (UL) {quadrant II}
      ;
  \draw[blue] (LR-ne) -- (LR-sw);

  \draw[red] (LL-ne) rectangle (LL-sw);

  \draw (LL-center) -- (UR-center)
                    -- (UL-center)
                    -- (LR-center);
\end{tikzpicture}

\end{document}

cylinder_with_two_parameters+geometry+style+learn.tex

% https://tex.stackexchange.com/a/21396/173708

\documentclass{article}
\usepackage{tikz} 
\usetikzlibrary{shapes}  

% split figures into pages
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{1pt}%


\begin{document}
	
\thispagestyle{empty} 

 \begin{tikzpicture}[
    transformer/.style 2 args={draw, 
    	cylinder, 
    	gray!80, 
    	rotate=90, 
    	minimum height=#1, 
    	minimum width=#2}]

	\node [transformer={2.3cm}{1cm}] () at (0,0.6) {};
\end{tikzpicture}  

% using n args={}{}
 \begin{tikzpicture}[
	transformer2/.style n args={2}{draw, 
		cylinder, 
		gray!50, 
		rotate=45, 
		minimum height=#1, 
		minimum width=#2}]

	\node [transformer2={2.3cm}{1cm}] () at (0,0.6) {};
\end{tikzpicture} 

%\begin{tikzpicture}[
% 	\def\mh{2.3cm}
% 	\def\mw{1cm} 	
%	transformer3/.style args={mh, mw}{draw, 
%		cylinder, 
%		gray!50, 
%		rotate=45, 
%		minimum height=mh, 
%		minimum width=mw}]
%
%	\node [transformer3={2.3cm}{1cm}] () at (0,0.6) {};
%\end{tikzpicture} 

\end{document}

doc-ml-cnn.tex

% https://davidstutz.de/illustrating-convolutional-neural-networks-in-latex-with-tikz/

\documentclass[twoside,11pt,a4paper]{article}
 
\usepackage[utf8]{inputenc}
\usepackage{amsmath, amssymb, latexsym}
 
\usepackage[left=2cm,right=2cm,top=2cm,bottom=2cm]{geometry}
\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}
\usetikzlibrary{fadings}
 
\begin{document}
 
\begin{figure}[t!]
   	\centering
   	\begin{tikzpicture}
   		\node at (0.5,-1){\begin{tabular}{c}input image\\layer $l = 0$\end{tabular}};
   		
   		\draw (0,0) -- (1,0) -- (1,1) -- (0,1) -- (0,0);
   		
   		\node at (3,3.5){\begin{tabular}{c}convolutional layer\\with non-linearities\\layer $l = 1$\end{tabular}};
   		
   		\draw[fill=black,opacity=0.2,draw=black] (2.75,1.25) -- (3.75,1.25) -- (3.75,2.25) -- (2.75,2.25) -- (2.75,1.25);
   		\draw[fill=black,opacity=0.2,draw=black] (2.5,1) -- (3.5,1) -- (3.5,2) -- (2.5,2) -- (2.5,1);
   		\draw[fill=black,opacity=0.2,draw=black] (2.25,0.75) -- (3.25,0.75) -- (3.25,1.75) -- (2.25,1.75) -- (2.25,0.75);
   		\draw[fill=black,opacity=0.2,draw=black] (2,0.5) -- (3,0.5) -- (3,1.5) -- (2,1.5) -- (2,0.5);
   		\draw[fill=black,opacity=0.2,draw=black] (1.75,0.25) -- (2.75,0.25) -- (2.75,1.25) -- (1.75,1.25) -- (1.75,0.25);
   		\draw[fill=black,opacity=0.2,draw=black] (1.5,0) -- (2.5,0) -- (2.5,1) -- (1.5,1) -- (1.5,0);
   		
   		\node at (4.5,-1){\begin{tabular}{c}subsampling layer\\layer $l = 3$\end{tabular}};
   		
   		\draw[fill=black,opacity=0.2,draw=black] (5,1.25) -- (5.75,1.25) -- (5.75,2) -- (5,2) -- (5,1.25);
   		\draw[fill=black,opacity=0.2,draw=black] (4.75,1) -- (5.5,1) -- (5.5,1.75) -- (4.75,1.75) -- (4.75,1);
   		\draw[fill=black,opacity=0.2,draw=black] (4.5,0.75) -- (5.25,0.75) -- (5.25,1.5) -- (4.5,1.5) -- (4.5,0.75);
   		\draw[fill=black,opacity=0.2,draw=black] (4.25,0.5) -- (5,0.5) -- (5,1.25) -- (4.25,1.25) -- (4.25,0.5);
   		\draw[fill=black,opacity=0.2,draw=black] (4,0.25) -- (4.75,0.25) -- (4.75,1) -- (4,1) -- (4,0.25);
   		\draw[fill=black,opacity=0.2,draw=black] (3.75,0) -- (4.5,0) -- (4.5,0.75) -- (3.75,0.75) -- (3.75,0);
   		
   		\node at (7,3.5){\begin{tabular}{c}convolutional layer\\with non-linearities\\layer $l = 4$\end{tabular}};
   		
   		\draw[fill=black,opacity=0.2,draw=black] (7.5,1.75) -- (8.25,1.75) -- (8.25,2.5) -- (7.5,2.5) -- (7.5,1.75);
   		\draw[fill=black,opacity=0.2,draw=black] (7.25,1.5) -- (8,1.5) -- (8,2.25) -- (7.25,2.25) -- (7.25,1.5);
   		\draw[fill=black,opacity=0.2,draw=black] (7,1.25) -- (7.75,1.25) -- (7.75,2) -- (7,2) -- (7,1.25);
   		\draw[fill=black,opacity=0.2,draw=black] (6.75,1) -- (7.5,1) -- (7.5,1.75) -- (6.75,1.75) -- (6.75,1);
   		\draw[fill=black,opacity=0.2,draw=black] (6.5,0.75) -- (7.25,0.75) -- (7.25,1.5) -- (6.5,1.5) -- (6.5,0.75);
   		\draw[fill=black,opacity=0.2,draw=black] (6.25,0.5) -- (7,0.5) -- (7,1.25) -- (6.25,1.25) -- (6.25,0.5);
   		\draw[fill=black,opacity=0.2,draw=black] (6,0.25) -- (6.75,0.25) -- (6.75,1) -- (6,1) -- (6,0.25);
   		\draw[fill=black,opacity=0.2,draw=black] (5.75,0) -- (6.5,0) -- (6.5,0.75) -- (5.75,0.75) -- (5.75,0);
   		
   		\node at (9.5,-1){\begin{tabular}{c}subsampling layer\\layer $l = 6$\end{tabular}};
   		
   		\draw[fill=black,opacity=0.2,draw=black] (10,1.75) -- (10.5,1.75) -- (10.5,2.25) -- (10,2.25) -- (10,1.75);
   		\draw[fill=black,opacity=0.2,draw=black] (9.75,1.5) -- (10.25,1.5) -- (10.25,2) -- (9.75,2) -- (9.75,1.5);
   		\draw[fill=black,opacity=0.2,draw=black] (9.5,1.25) -- (10,1.25) -- (10,1.75) -- (9.5,1.75) -- (9.5,1.25);
   		\draw[fill=black,opacity=0.2,draw=black] (9.25,1) -- (9.75,1) -- (9.75,1.5) -- (9.25,1.5) -- (9.25,1);
   		\draw[fill=black,opacity=0.2,draw=black] (9,0.75) -- (9.5,0.75) -- (9.5,1.25) -- (9,1.25) -- (9,0.75);
   		\draw[fill=black,opacity=0.2,draw=black] (8.75,0.5) -- (9.25,0.5) -- (9.25,1) -- (8.75,1) -- (8.75,0.5);
   		\draw[fill=black,opacity=0.2,draw=black] (8.5,0.25) -- (9,0.25) -- (9,0.75) -- (8.5,0.75) -- (8.5,0.25);
   		\draw[fill=black,opacity=0.2,draw=black] (8.25,0) -- (8.75,0) -- (8.75,0.5) -- (8.25,0.5) -- (8.25,0);
   		
   		\node at (12,3.5){\begin{tabular}{c}fully connected layer\\layer $l = 7$\end{tabular}};
   		
   		\draw[fill=black,draw=black,opacity=0.5] (10.5,0) -- (11,0) -- (12.5,1.75) -- (12,1.75) -- (10.5,0);
   		
   		\node at (13,-1){\begin{tabular}{c}fully connected layer\\output layer $l = 8$\end{tabular}};
   		
   		\draw[fill=black,draw=black,opacity=0.5] (12.5,0.5) -- (13,0.5) -- (13.65,1.25) -- (13.15,1.25) -- (12.5,0.5);
   	\end{tikzpicture}
   	\caption[Architecture of a traditional convolutional neural network.]{The architecture of the original convolutional neural network, as introduced by LeCun et al. (1989), alternates between convolutional layers including hyperbolic tangent non-linearities and subsampling layers. In this illustration, the convolutional layers already include non-linearities and, thus, a convolutional layer actually represents two layers. The feature maps of the final subsampling layer are then fed into the actual classifier consisting of an arbitrary number of fully connected layers. The output layer usually uses softmax activation functions.}
   	\label{fig:traditional-convolutional-network}
\end{figure}
 
\end{document}

doc-ml-single_cnn.tex

% https://davidstutz.de/illustrating-convolutional-neural-networks-in-latex-with-tikz/

\documentclass[twoside,11pt,a4paper]{article}
 
\usepackage[utf8]{inputenc}
\usepackage{amsmath, amssymb, latexsym}
\usepackage{sidecap}
 
\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}
 
\begin{document}
 
\begin{SCfigure}[2\sidecaptionrelwidth][t]
   	\centering
   	\begin{tikzpicture}
   		\node at (1.5,4){\begin{tabular}{c}input image\\or input feature map\end{tabular}};
   	
   		\draw (0,0) -- (3,0) -- (3,3) -- (0,3) -- (0,0);
   		
   		\draw (2,2) -- (2.5,2) -- (2.5,2.5) -- (2,2.5) -- (2,2);
   		\draw (2,0.5) -- (2.5,0.5) -- (2.5,1) -- (2,1) -- (2,0.5);
   		\draw (1,1) -- (1.5,1) -- (1.5,1.5) -- (1,1.5) -- (1,1);
   		
   		\draw (2.5,2) -- (7,3.25);
   		\draw (2.5,2.5) -- (7,3.25);
 
   		\draw (2.5,1) -- (5.75,0.25);
   		\draw (2.5,0.5) -- (5.75,0.25);
   		
   		\draw (1.5,1.5) -- (5.5,1.25);
   		\draw (1.5,1) -- (5.5,1.25);
   		
   		\node at (5.75,4){\begin{tabular}{c}output feature maps\end{tabular}};
   		
   		\draw[fill=black,opacity=0.2,draw=black] (5.5,1.5) -- (7.5,1.5) -- (7.5,3.5) -- (5.5,3.5) -- (5.5,1.5);
   		\draw[fill=black,opacity=0.2,draw=black] (5,1) -- (7,1) -- (7,3) -- (5,3) -- (5,1);
   		\draw[fill=black,opacity=0.2,draw=black] (4.5,0.5) -- (6.5,0.5) -- (6.5,2.5) -- (4.5,2.5) -- (4.5,0.5);
   		\draw[fill=black,opacity=0.2,draw=black] (4,0) -- (6,0) -- (6,2) -- (4,2) -- (4,0);
   	\end{tikzpicture}
   	\caption[Illustration of a convolutional layer.]{Illustration of a single convolutional layer. If layer $l$ is a convolutional layer, the input image (if $l = 1$) or a feature map of the previous layer is convolved by different filters to yield the output feature maps of layer $l$.}
   	\label{fig:convolutional-layer}
\end{SCfigure}
 
\end{document}

drawstack+diagram.tex

% https://gitlab.com/tikz-goodies/tikz-goodies/-/blob/master/drawstack/stack-example.tex
\documentclass[tikz,border=10pt]{standalone}

\usepackage{drawstack}

% Use this instead if you don't want colors.
% \usepackage[nocolor]{drawstack}

\title{{\tt drawstack.sty}: Draw execution stack easily in LaTeX}
\author{Matthieu Moy}

\begin{document}
	
\begin{tikzpicture}[scale=.8]

	\stacktop{}
	\separator
	\cell{\texttt{p3}}        \cellcomL{11(GB)} \coordinate (p3) at (currentcell.east);
	\separator
	\cell{\texttt{p2}}        \cellcomL{10(GB)} \coordinate (p2) at (currentcell.east);
	\separator
	\cell{\texttt{p1}}        \cellcomL{ 9(GB)} \coordinate (p1) at (currentcell.east);
	\separator
	\cell{\texttt{@P3D.diag}} \cellcomL{ 8(GB)}
	\cell{\texttt{\footnotesize @Object.equals}} \cellcomL{ 7(GB)}
	\cell{\texttt{3(GB)}}     \cellcomL{ 6(GB)} \coordinate (T1) at (currentcell.east);
	\separator
	\cell{\texttt{@P2D.diag}} \cellcomL{ 5(GB)}
	\cell{\texttt{\footnotesize @Object.equals}} \cellcomL{ 4(GB)}
	\cell{\texttt{1(GB)}}     \cellcomL{ 3(GB)} \coordinate (T2) at (currentcell.east);
	\separator
	\cell{\texttt{\footnotesize @Object.equals}} \cellcomL{ 2(GB)}
	\cell{\texttt{null}}      \cellcomL{ 1(GB)}
	\cell[draw=none]{Stack}
	
	
	\drawstruct{(5,1)})
	\structcell{z=2,5}
	\structcell{y=2,5}
	\structcell{x=2,5}
	\structcell{.} \coordinate (O1) at (currentcell.west);
	\coordinate (O1l) at (currentcell.south);
	
	\drawstruct{(9,-3)}
	\structcell{y=1}
	\structcell{x=1}
	\structcell{.} \coordinate (O2) at (currentcell.west);
	\coordinate (O2l) at (currentcell.south);
	
	\draw[->] (p3) -- (O1);
	\draw[->] (p2) -- (O1);
	\draw[->] (p1) -- (O2);
	
	\draw[->] (O1l) .. controls (O1 |- T1) .. (T1);
	\draw[->] (O2l) .. controls (O2 |- T2) .. (T2);
	
	\draw (10,-10) node{Heap};

\end{tikzpicture}

\end{document}

elem-10_circles+elem+foreach.tex

% modified by +arr
% add label number to each of the circles
\documentclass[crop, border=10pt, tikz]{standalone}

\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
	\foreach \x in {1,...,10} {
		\draw (\x,0) circle (0.4cm) node {\x}; % add label number
		\draw (\x,1) circle (0.4cm) node {\x}; % draw second row
	}
\end{tikzpicture}

\end{document}

elem-3_nodes_triangle+elem+foreach.tex

% from Helmund slides
\documentclass[tikz,border=10pt]{standalone}
%\documentclass[crop, tikz]{standalone}

\usepackage{tikz}

\begin{document}

\begin{tikzpicture}[scale=.9, transform shape]
	\tikzstyle{every node} = [circle, fill=red!30]
	\node (a) at (0, 0) {A};
	\node (b) at +(0: 1.5) {B};
	\node (c) at +(60: 1.5) {C};
	\foreach \from / \to in {a/b, b/c, c/a}
		\draw [->] (\from) -- (\to);
\end{tikzpicture}

\end{document}

elem-add_tikz_symbols_to_block_arr+symbol+diagram+command+style.tex

\documentclass[border=10]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes,arrows}


\newcommand{\symbolA}{
	% red symbol
	\tikz \draw[red] (0,0)--(0,0.2)--(0.2,0.2)--(0.2,0.4)--(0.4,0.4);
}

\newcommand{\symbolB}{
	% blue symbol
	\tikz[y={(0,-1)}] \draw[blue] (0,0)--(0,0.2)--(0.2,0.2)--(0.2,0.4)--(0.4,0.4);
}

\newcommand{\symbolC}{
	% another way to add symbols
	\begin{tikzpicture}
		\draw[fill=green] (0,0) circle (0.2cm);
	\end{tikzpicture}
}

\begin{document}

\tikzstyle{block} = [draw, fill=blue!20,  rectangle, 
    minimum height=3em, minimum width=6em]
\tikzstyle{sum} = [draw, fill=blue!20, circle, node distance=1cm]
\tikzstyle{input} = [coordinate]
\tikzstyle{output} = [coordinate]
\tikzstyle{pinstyle} = [pin edge={to-, thin, black}]

% The block diagram code is probably more verbose than necessary
\begin{tikzpicture}[auto,  node distance=2cm, >=latex']

    % We start by placing the blocks
    \node [input, name=input] {};
    \node [sum, right of=input] (sum) {};
    \node [block, right of=sum] (controller) {\symbolA};
    
    % add label to controller
     \node[above of=controller] (ctrlabel)  [yshift=-0.75cm] {Controller};
     % add arrow from label to box
    \draw[->] (ctrlabel) -- (controller);
    
    % this is option 1: adding label on top
%    \node [block, right of=controller, pin={[pinstyle] above:Disturbances},
%            node distance=3cm] (system) {\symbolB};
	% this option 2: adding label on top
    \node [block, right of=controller, node distance=3cm] (system) {\symbolB};
    % add label "Disturbances" above system
    \node[above of=system] (syslabel) [yshift=-0.75cm] {Disturbances};
    \draw[->] (syslabel) -- (system);

    % We draw an edge between the controller and system block to 
    % calculate the coordinate "u". We need it to place the measurement block. 
    \draw [->] (controller) -- node[name=u] {$u$} (system);
    \node [output, right of=system] (output) {};
    \node [block, below of=u] (measurements) {\symbolC};
    
    % add label to "measurements" block
     \node[below of=measurements] (mealabel) [yshift=0.75cm] {Measurements};
    \draw[->] (mealabel) -- (measurements);
    

    % Once the nodes are placed, connecting them is easy. 
    \draw [draw,->] (input) -- node {$r$} (sum);
    \draw [->] (sum) -- node {$e$} (controller);
    \draw [->] (system) -- node [name=y] {$y$}(output);
    \draw [->] (y) |- (measurements);
%    \draw [->] (measurements) -| node[pos=0.99] {$-$} 
%        node [near end] {$y_m$} (sum);
    \draw [->] (measurements) -|  node  [near end] {$y_m$} (sum);
    \draw (sum) node [yshift=-7, xshift=-7]  {$-$};
\end{tikzpicture}
\end{document}

elem-circle_axes_ticks+elem+geometry+foreach.tex

% modified by +arr
% change tick color and thickness 
%\documentclass[tikz,border=15pt]{standalone}
\documentclass[crop,border=15pt]{standalone}

\usepackage{tikz}

\begin{document}

% ticks on the axes
\begin{tikzpicture}[scale=3]

	% draw the axes
	\draw[->] (-1.5,0) -- (1.5,0);
	\draw[->] (0,-1.5) -- (0,1.5);
	
	% draw the circle
	\draw (0,0) circle (1cm);
	
	% draw the ticks
	\foreach \x in {-1cm,-0.5cm,1cm}
		\draw[red,thick] (\x,-1pt) -- (\x,1pt);
	\foreach \y in {-1cm,-0.5cm,0.5cm,1cm}
		\draw[red, thick] (-1pt,\y) -- (1pt,\y);
		
\end{tikzpicture}

\end{document}

elem-circle_grided+elem+geometry.tex

% +arr: even thinner grid

\documentclass[tikz,border=10pt]{standalone}
%\documentclass[crop, tikz]{standalone}

\usepackage{tikz}

\begin{document}
	
\begin{tikzpicture}
	\draw[step=.5cm,gray!50,very thin] (-1.4,-1.4) grid(1.4,1.4);
	\draw (-1.5,0) -- (1.5,0);
	\draw (0,-1.5) -- (0,1.5);
	\draw (0,0) circle (1cm);
\end{tikzpicture}
	
\end{document}

elem-circle_half+elem+geometry.tex

\documentclass[tikz,border=10pt]{standalone}
%\documentclass[crop, tikz]{standalone}

\usepackage{tikz}

\begin{document}
	
\begin{tikzpicture}
	% draw axis
	\draw (-1.5,0) -- (1.5,0);
	\draw (0,-1.5) -- (0,1.5);
	
	\draw (-1,0) .. controls (-1,0.555) and (-0.555,1) .. (0,1)
	.. controls (0.555,1) and (1,0.555) .. (1,0);
\end{tikzpicture}
	
\end{document}

elem-cube+elem+geometry+foreach.tex

\documentclass[tikz,border=10pt]{standalone}
\usepackage[margin=25mm]{geometry}
\usepackage{tikz}

%% like standalone
%\usepackage[active,tightpage]{preview}
%\PreviewEnvironment{tikzpicture}
%\setlength\PreviewBorder{5pt}%

\begin{document}

\begin{tikzpicture}
\foreach \x in{0,...,4}
{   \draw (0,\x ,4) -- (4,\x ,4);
    \draw (\x ,0,4) -- (\x ,4,4);
    \draw (4,\x ,4) -- (4,\x ,0);
    \draw (\x ,4,4) -- (\x ,4,0);
    \draw (4,0,\x ) -- (4,4,\x );
    \draw (0,4,\x ) -- (4,4,\x );
}
\end{tikzpicture}

\end{document}

elem-cuboid_finer_grid+elem+foreach+command.tex

% https://www.overleaf.com/learn/latex/page_size_and_margins
%
% arr: move draw to two tikz environments not document
%	change paper size with geometry
% add manual way of creating a cuboid

\documentclass{article}
\usepackage{geometry}
\geometry{
	a5paper,
	left=10mm,
	top=20mm,
} 

\usepackage{tikz}

\newcommand{\tikzcuboid}[4]{% width, height, depth, scale
	% define tikz object
	\begin{tikzpicture}[scale=#4]
		\foreach \x in {0,...,#1}
		{   \draw (\x ,0  ,#3 ) -- (\x ,#2 ,#3 );
			\draw (\x ,#2 ,#3 ) -- (\x ,#2 ,0  );
		}
		\foreach \x in {0,...,#2}
		{   \draw (#1 ,\x ,#3 ) -- (#1 ,\x ,0  );
			\draw (0  ,\x ,#3 ) -- (#1 ,\x ,#3 );
		}
		\foreach \x in {0,...,#3}
		{   \draw (#1 ,0  ,\x ) -- (#1 ,#2 ,\x );
			\draw (0  ,#2 ,\x ) -- (#1 ,#2 ,\x );
		}
	\end{tikzpicture}
}

\newcommand{\tikzcube}[2]{% length, scale
	\tikzcuboid{#1}{#1}{#1}{#2}
}


\begin{document}
	
\begin{tikzpicture}[scale=0.5]
	% manual way of creating a cuboid drawing lines
	\foreach \x in {0,...,11}
	{   \draw[gray] (\x, 0, 5 ) -- (\x, 7, 5 );
		\draw[gray] (\x, 7, 5 ) -- (\x, 7, 0 );
	}
	\foreach \x in {0,...,7}
	{   \draw[gray!75] (11, \x, 5) -- (11, \x, 0);
		\draw[gray!75] (0, \x, 5) -- (11, \x, 5);
	}
	\foreach \x in {0,...,5}
		{   \draw[gray!25]  (11, 0, \x ) -- (11, 7, \x);
			\draw[gray!25]  (0, 7, \x) -- (11, 7, \x);
	}
\end{tikzpicture}

\vspace{35pt}

\begin{tikzpicture}
	\tikzcuboid{11}{7}{5}{0.5}
\end{tikzpicture}

\vspace{20pt}

\begin{tikzpicture}
	\tikzcube{13}{0.25}
\end{tikzpicture}

\end{document}

elem-custom-three_objects+symbols+command.tex

\documentclass[margin=10pt]{standalone}
\usepackage{tikz}

\usetikzlibrary{calc, positioning}

\tikzset{
    basic/.style={draw=black,fill=white,thick,rectangle,rounded corners=20pt, align=center},
    HeatEx/.style={draw=black,fill=white,thick,circle,minimum width=1cm},
    Tank/.style={basic, minimum width=1.5cm,minimum height=3cm,text width=1.5cm},
    3Phase/.style={basic, minimum width=4cm,minimum height=1.5cm,text width=4cm},
    Reactor/.style={basic, ultra thick,minimum width=1.5cm,minimum height=4cm,text width=1.5cm},
}

\newcommand{\COOLER}[3]{
    \node[HeatEx,right=#1 of #2](#3){};
    \draw[thick,-latex] ($(#3.south east)+(3mm,0)$) to[out=170,in=-20] ($(#3.north west)+(-3mm,0)$);
}

\newcommand{\HEATER}[4]{
    \node[HeatEx,below right=#1 and #2 of #3](#4){};
    \draw[thick,-latex] ($(#4.north east)+(3mm,0)$) to[out=200,in=20] ($(#4.south west)+(-3mm,0)$);
}

\newcommand{\TANK}[4]{
    \node[Tank,right=#1 of #2](#3){#4};
}

\newcommand{\ThreeSEP}[5]{
    \node[3Phase,right=#1 of #2](#3){#4};
    \draw[thick] (#3.south) to[out=-90,in=-90, looseness=2] node[midway] (sman) {} ($(#3.south)!.5!(#3.south east)$);
    \draw[thick,->] (sman.center) --++ (0,-1cm) -- (#5);
}

\newcommand{\REACTOR}[5]{
    \node[Reactor,below right=#1 and #2 of #3](#4){#5};
}

\begin{document}
\begin{tikzpicture}
    \node (START) {Text};
    \TANK{1cm}{START}{F1}{Tanks}
    \node[below right=of F1] (W1) {Text};
    \COOLER{1cm}{F1}{C1}
    \REACTOR{1cm}{1cm}{C1}{R1}{Reactor}
    \HEATER{1cm}{1cm}{R1}{H1}
    \ThreeSEP{1cm}{H1}{S1}{Separator}{15,-12}

%Arrows    
    \draw[thick,-latex] (START.east) to (F1.west);
    \draw[thick,-latex] (F1.south) |- (W1);
    \draw[thick,-latex] (F1.east) to (C1.west);
    \draw[thick,-latex] (C1.east) -| (R1.north);
    \draw[thick,-latex] (R1.south) |- (H1.west);
    \draw[thick,-latex] (H1.east) to (S1.west);
\end{tikzpicture}
\end{document}

elem-cylinder+elem+3d+foreach+function.tex

% +3d+foreach+function
% +arr: change paper size, add comments
%	indent plot function, space parameters
% this could be the easiest way to draw 3d objects by using plot and function

\documentclass[tikz,border=5pt]{standalone}
\usetikzlibrary{shapes.geometric}
\usepackage{tikz-3dplot}


\begin{document}

\tdplotsetmaincoords{70}{30}   % projection angle

\begin{tikzpicture}[tdplot_main_coords]
	% add axis x, y, z
	\draw[->] (0,-4,0) -- (0,4,0) node[above right] {$x$};
	\draw[->] (-4,0,0) -- (4,0,0) node[below right] {$y$};
	\draw[->] (0,0,4) -- (0,0,-4) node[below right] {$z$};
	
	% using plot function to add top and bottom of cylinder
	\draw plot[variable=\x, domain=0:360, samples=180]    ( {cos(\x)}, -1.25, {sin(\x)} );
	\draw plot[variable=\x, domain=-45:135, samples=180] ( {cos(\x)},  1.25, {sin(\x)} );
	
	% draw sides of cylinder using the angles
	\foreach \x in {135,-45} { 
		\draw ({cos(\x)},-1.25,{sin(\x)}) -- ({cos(\x)},1.25,{sin(\x)});}
	%\node (a) [draw, cylinder, shape aspect=1.8, rotate=180, minimum height=25mm, minimum width=12mm] {};

\end{tikzpicture}

\end{document}

elem-draw_circles_through+elem+geometry.tex

% from Helmund slides
\documentclass[tikz,border=10pt]{standalone}
%\documentclass[crop, tikz]{standalone}

\usepackage{tikz}
\usetikzlibrary{calc,through}

\begin{document}

\begin{tikzpicture}[scale=1.2]
	% establish the coordinates for the master reference points
	\coordinate [label=left: $A$] (A) at (0, 0);
	\coordinate [label=right:$B$] (B) at (1.25, 0.25);
	
	% draw the geometries
	\draw (A) -- (B);   % line between A and B
	
	% Node D will be when we draw a circle at A (center) that passes through B
	\node (D) [draw, circle through=(B), label=left:$D$] at (A) {};
	% Node E will be when we draw a circle at B ( center) that passes through A
	\node (E) [draw, circle through=(A), label=right:$E$] at (B) {};
	
	\coordinate[label=above:$C$] (C) at (intersection 2 of D and E);
	
	\draw [red] (A) -- (C);
	\draw [red] (B) -- (C);

\end{tikzpicture}

\end{document}

elem-draw_ticks+elem+foreach.tex

% arr: add line, change color
\documentclass[tikz,border=10pt]{standalone}

\usepackage{tikz}

\begin{document}

% draw ticks
\begin{tikzpicture}
	% If you provide two numbers before the ..., the \foreach statement will use their diﬀerence for the stepping:
	\draw[gray!75] (-1,0) -- (1, 0);   % draw line
	\foreach \x in {-1,-0.5,...,1}
		\draw (\x cm,-1pt) -- (\x cm,1pt);
\end{tikzpicture}

\end{document}

elem-drawing_inside_box+elem+diagram+symbol.tex

% https://tex.stackexchange.com/a/55242/173708
% arr: reindent; change page size
\documentclass[border=10]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning}


\newcommand{\symbolA}{
	\tikz \draw[red] (0,0)--(0,0.2)--(0.2,0.2)--(0.2,0.4)--(0.4,0.4);
}

\newcommand{\symbolB}{
	\tikz[y={(0,-1)}] \draw[blue] (0,0)--(0,0.2)--(0.2,0.2)--(0.2,0.4)--(0.4,0.4);
}

\newcommand{\symbolC}{
	\begin{tikzpicture}
		\draw[fill=green] (0,0) circle (0.2cm);
	\end{tikzpicture}
}


\begin{document}

\begin{tikzpicture}
	\node[draw](A) at (0,0){\symbolA};
	\node[draw, right=2em of A] (B) {\symbolB};
	\node[draw, right=2em of B] (C) {\symbolC};
	\draw[-latex] (A) -- (B);
	\draw[-latex](B) -- (C);
\end{tikzpicture}

\end{document}

elem-equation+elem+foreach.tex

\documentclass[border=15pt]{standalone}
\usepackage{tikz}

\begin{document}

% {$x =\x$, }
\begin{tikzpicture}
	\foreach \x in {1,2,3} 
		 \draw (\x,0) node (0.8cm) {$x=\x$,};
\end{tikzpicture}

\end{document}

elem-grid_RBG_draw_boxes+elem+foreach+style.tex

% arr: add comments, indent code
%	change cell color to gray

\documentclass[tikz,border=10pt]{standalone}
%\documentclass[crop, tikz]{standalone}

\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
	[%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	box/.style={rectangle, draw=black, thick, minimum size=1cm, fill=gray!10},
	]%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	
	% draw boxes based on (x,y) coordinates
	\foreach \x in {0,1,...,10} {
		\foreach \y in {0,1,...,10}   
			\node[box] at (\x, \y) {}; 
	}
	
	\node[box, fill=green] at (8,8){};  
	\node[box, fill=red  ] at (5,5){};  
	\node[box, fill=blue ] at (2,2){};  

\end{tikzpicture}

\end{document}

elem-grid_RBG_draw_lines+elem+3d+pgf+foreach.tex

% https://tex.stackexchange.com/a/271584/173708
% Modified by +arr for 7x7 plane, change paper size
% add comments

\documentclass[border={10}]{standalone}
\usepackage{tikz}  
\usepackage{tikz-3dplot} 

\tdplotsetmaincoords{60}{125} % view angles
\tdplotsetrotatedcoords{0}{0}{0} 

\begin{document}

\begin{tikzpicture}
    [%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        scale=5,tdplot_rotated_coords,
        grid/.style={very thin,gray}
    ]%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    %draw a grid in the x-y plane
    \foreach \x in {0,1,...,7}
        \foreach \y in {0,1,...,7} {
            \draw[grid] (\x,0) -- (\x,7);  % draw horizontal lines
            \draw[grid] (0,\y) -- (7,\y);  % draw vertical lines
        };
    % draw the color filled squares
    \draw[fill=blue]   (0,0,0) -- (0,1,0) -- (1,1,0) -- (1,0,0) -- cycle;
    \draw[fill=green]  (1,1,0) -- (2,1,0) -- (2,2,0) -- (1,2,0) -- cycle;

\end{tikzpicture}    
\end{document}

elem-highlight_curve.tex

% https://latexdraw.com/how-to-highlight-parts-of-a-function-and-change-the-background-color-in-latex-using-tikz/
% arr: indenting code; add comments
\documentclass[dvipsnames]{standalone}

\usepackage{tikz}
\usepackage{pgfplots}
\pgfplotsset{compat = newest}

\begin{document}
\begin{tikzpicture}
	\begin{axis}
		[
			xmin = 0, xmax = 7,
			ymin = -20, ymax = 20,
			width = 8cm,
			height = 6.5cm,
			xtick distance = 1,
			ytick distance = 4,
			smooth,
			xlabel=$x$-axis,
			ylabel=$y$-axis,
			set layers,
		]
		% plot background yellowish
		\begin{pgfonlayer}{axis background}
			\fill [yellow!10] (0,-20) rectangle (7,20);
		\end{pgfonlayer}
		% superposing three curves with different thickness and colors
		\addplot[Green!20, domain = 0:7, line width=4mm] {(x-1)*(x-3)^2*(x-6)};   % very thick curve
		\addplot[Green!30, domain = 0:7, line width=2mm] {(x-1)*(x-3)^2*(x-6)}; % thick curve
		\addplot[Green, domain = 0:7, thick] {(x-1)*(x-3)^2*(x-6)};             % thin curve
	\end{axis}

\end{tikzpicture}
\end{document}

elem-magnification+elem+geometry.tex

\documentclass{standalone}
\usepackage{tikz} % http://ctan.org/pkg/pgf
\usetikzlibrary{spy, backgrounds}

\begin{document}

\begin{tikzpicture} [spy using outlines={circle, magnification=8, size=2cm, connect spies, transform shape}]
	\draw[red] (2.9,0) -- (2.9,4);
	\draw[help lines] (0,0) grid (4,4);
	\draw (0,0) -- (3,3) -- (3,0);
	%   \begin{pgfonlayer}{background}
	%    \draw[red] (2.9,0) -- (2.9,4);
	%   \end{pgfonlayer}
	\spy [black] on (3,3) in node [left] at (6,5.5);
\end{tikzpicture}
\end{document}

elem-mass_inclined_plane.tex

% https://tex.stackexchange.com/a/13405/173708
\documentclass[border=15pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc}

\begin{document}

\begin{tikzpicture}[every node/.style={draw}]

    \begin{scope}[rotate=-30]
        \node at (3,0) [draw,name=A,rectangle, minimum width=2cm,minimum height=1cm,anchor=south,label=$m_1$,transform shape] {};
        \node at (6,0) [name=B,rectangle, minimum width=1cm,minimum height=0.75cm,anchor=south,label=$m_2$,transform shape] {};
        \node at (0,0) [name=C,circle,minimum size=.8cm,transform shape] {}; % pulley

        \draw (C.north) -- ($(A.south west)!(C.north)!(A.north west)$);
        \draw ($(A.south east)!(C.north)!(A.north east)$) -- ($(B.south west)!(C.north)!(B.north west)$);
        \draw(1,0) -- (8,0);
    \end{scope}
    % draw the vertical part
    \node at (-0.4,-5) [draw,name=D,rectangle, minimum width=1cm,minimum height=2cm,anchor=south,label=right:$m_3$] {};
    \draw ($(D.north west)!(C.210)!(D.north east)$) -- (C.210)  arc [start angle=180,end angle=60,radius=0.4cm];
\end{tikzpicture}
\end{document}

elem-matrix-as_nodes+elem+matrix.tex

\documentclass{standalone} 
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
	\draw[help lines] (0,0) grid (4,2);
	% draw a matrix table
	\node [matrix,fill=red!20,draw=blue,very thick] (my matrix) at (2,1)
	% draw four elements, each in one of the cells
	{
		\draw (0,0) circle (4mm);   & \node[rotate=10] {Hello}; \\
		\draw (0.2,0) circle (2mm); & \fill[red] (0,0) circle (3mm); \\
	};
	% draw the arrow from the origin
	\draw [very thick,->] (0,0) |- (my matrix.west);
\end{tikzpicture}
\end{document}

elem-node_connector+elem+diagram+command+params.tex

% https://hugoideler.com/2013/01/tikz-node-connector/
\documentclass{standalone}

\usepackage{tikz}
\usetikzlibrary{calc}
\usetikzlibrary{positioning}

\newcommand*{\connectorH}[4][]{
  \draw[#1] (#3) -| ($(#3) !#2! (#4)$) |- (#4);
}
\newcommand*{\connectorV}[4][]{
  \draw[#1] (#3) |- ($(#3) !#2! (#4)$) -| (#4);
}

\begin{document}

\begin{tikzpicture}[every node/.style={draw, minimum size=1cm, thick, fill=white}]
  \node[] (a) {A};
  \node[above right=1cm and 2cm of a] (b) {B};
  \node[below right=1cm and 2cm of a] (c) {C};

  \connectorH[->, red]{0.50}{a}{b}
  \connectorH[->, blue]{0.75}{a}{c}
\end{tikzpicture}

\end{document}

elem-physics-arrows_to_nodes+elem+phsyics.tex

% Author: Izaak Neutelings (September 2018)
\documentclass[border=3pt,tikz]{standalone}
\usepackage{amsmath} % for \;
\usepackage{tikz}

\usepackage{xcolor}
\colorlet{myblue}{blue!70!black}
\colorlet{mylightblue}{blue!10}
\tikzset{>=latex} % for LaTeX arrow head

\begin{document}


\begin{tikzpicture}[yscale=0.8,anchor=west]
  
  % FIRST COLUMN
  \node[anchor=west,draw=myblue,fill=mylightblue,thick,rounded corners=4,inner sep=1.5pt] (L) at (0,4) {\;\strut$qq\nu\nu$\;};  
  \node (L1) at (0.5,3) {\strut$jj\nu\nu$};
  \node (L2) at (-1.5,2) {\strut bb$\nu\nu$};
  \node (L3) at (0.5,1) {\strut tt$\nu\nu$};
  \draw[->,myblue,thick] (L.south west) ++ (0.18,0) |- (L1.west);
  \draw[->,myblue,thick] (L.south west) ++ (0.18,0) |- (L2.east);
  \draw[->,myblue,thick] (L.south west) ++ (0.18,0) |- (L3.west);
  
  % SECOND COLUMN
  \begin{scope}[shift={(2.5,0)}]
    \node[draw=myblue,fill=mylightblue,thick,rounded corners=4,inner sep=1.5pt] (M) at (0,4) {\;\strut$qq\ell\ell$\;};
    \node (M1) at (0.5,3) {\strut$jj\mu\mu$};
    \node (M2) at (0.5,2) {\strut bb$\tau\tau$, b$\tau\tau$};
    \node (M3) at (0.5,1) {\strut tt$\tau\tau$};
    \draw[->,myblue,thick] (M.south west)++(0.18,0) |- (M1.west);
    \draw[->,myblue,thick] (M.south west)++(0.18,0) |- (M2.west);
    \draw[->,myblue,thick] (M.south west)++(0.18,0) |- (M3.west);
  \end{scope}
  
  % THIRD COLUMN
  \begin{scope}[shift={(5.0,0)}]
    \node[draw=myblue,fill=mylightblue,thick,rounded corners=4,inner sep=1.5pt] (R) at (0,4) {\;\strut$qq\ell\nu$\;};
    \node (R1) at (0.5,3) {\strut$jj\mu\nu$};
    \draw[->,myblue,thick] (R.south west)++(0.18,0) |- (R1.west);
  \end{scope}

\end{tikzpicture}

\end{document}

elem-physics-example_atom+elem+physics.tex

% https://wiki.physik.uzh.ch/cms/latex:example_atom
    % Author: Izaak Neutelings (July, 2017)

\documentclass{article}
\usepackage{tikz}

% colors
\definecolor{mylightred}{RGB}{255,210,210}
\definecolor{myred}{RGB}{200,100,100}
\definecolor{mydarkred}{RGB}{140,40,40}
\definecolor{mylightblue}{RGB}{220,228,255}
\definecolor{myblue}{RGB}{183,191,229}
\definecolor{mydarkblue}{RGB}{50,70,190}

% split figures into pages
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{1pt}%

\begin{document}
	
	
	
% RUTHERFORD MODEL - atom model with central charge
\begin{tikzpicture}[scale=1]
	\coordinate (O)  at (0,0);
	\draw[mylightred,fill]         (O) circle (50pt);
	\draw[mydarkred,thick]         (O) circle (50pt) node[above right=34pt] {$-Ze$};
	\fill[radius=2.0pt,mydarkblue] (O) circle node[above=2pt] {$+Ze$};
\end{tikzpicture}



% RUTHERFORD MODEL - atom model with central charge and corpuscles
\begin{tikzpicture}[scale=1]
	\coordinate (O)  at (0,0);
	\draw[myred,dashed]            (O) circle (50pt);
	\fill[radius=2.0pt,mydarkblue] (O) circle node[above=2pt] {$+Ze$};
	\fill[radius=0.8pt,mydarkred]
	( 0.20, 1.20)  circle node[above right=-1pt,scale=0.75] {$-e$}
	( 0.68, 0.67)  circle node[above right=-1pt,scale=0.75] {$-e$}
	( 1.05,-1.10)  circle node[above left =-1pt,scale=0.75] {$-e$}
	( 0.75,-0.12)  circle node[      right= 2pt,scale=0.75] {$-e$}
	( 0.21,-1.30)  circle node[above left =-1pt,scale=0.75] {$-e$}
	(-0.80, 0.60)  circle node[above left =-1pt,scale=0.75] {$-e$}
	(-0.50, 1.21)  circle node[above right=-1pt,scale=0.75] {$-e$}
	(-0.08,-0.55)  circle node[above left =-1pt,scale=0.75] {$-e$}
	(-0.58,-0.95)  circle node[above left =-1pt,scale=0.75] {$-e$}
	(-1.10,-0.20)  circle node[above left =-1pt,scale=0.75] {$-e$};
\end{tikzpicture}



% THOMSON MODEL - atom model with corpuscles (electrons) in uniformly, positively charged sphere
\begin{tikzpicture}[scale=1]
	\coordinate (O)  at (0,0);
	\draw[mylightblue,fill] (O) circle (50pt);
	\draw[mydarkblue,thick] (O) circle (50pt) node[above right=34pt] {$+Ze$};
	\fill[radius=0.8pt,mydarkred]
	( 0.20, 1.20)  circle node[above right=-1pt,scale=0.75] {$-e$}
	( 0.10, 0.30)  circle node[above right=-1pt,scale=0.75] {$-e$}
	( 0.68, 0.67)  circle node[above right=-1pt,scale=0.75] {$-e$}
	( 1.05,-1.10)  circle node[above left =-1pt,scale=0.75] {$-e$}
	( 0.75,-0.12)  circle node[      right= 2pt,scale=0.75] {$-e$}
	( 0.21,-1.30)  circle node[above left =-1pt,scale=0.75] {$-e$}
	( 0.18,-0.55)  circle node[above left =-1pt,scale=0.75] {$-e$}
	(-0.80, 0.60)  circle node[above left =-1pt,scale=0.75] {$-e$}
	(-0.50, 1.21)  circle node[above right=-1pt,scale=0.75] {$-e$}
	(-0.40, 0.05)  circle node[above left =-1pt,scale=0.75] {$-e$}
	(-0.58,-0.95)  circle node[above left =-1pt,scale=0.75] {$-e$}
	(-1.10,-0.20)  circle node[above left =-1pt,scale=0.75] {$-e$};
\end{tikzpicture}
	
	
	
\end{document}

elem-placing_labels_circle.tex

\documentclass[border=3mm,tikz]{standalone}
%  \documentclass{scrartcl}
\usepackage{tikz}
\begin{document} 

\begin{tikzpicture}
    \node [draw,circle ] (a) { Real label}; 
    \node  at (a.60) {$\bullet$}; 
    \node [draw] at ([shift={(95:1)}]a.60) {Second label};
\end{tikzpicture}

\end{document}

elem-placing_labels.tex

% https://tex.stackexchange.com/a/58880/173708
% set node label position more precisely
\documentclass[border=3mm,tikz]{standalone}
%\documentclass{article}
\usepackage{tikz,comment}

\begin{comment}
	You can define the direction of the label by using label=<angle>:<label text>. To specify the distance on a per node distance, you have to supply it to the label options: label={[label distance=<distance>]<angle>:<label text>}
\end{comment}

\begin{document}

\begin{tikzpicture}
	[
		every node/.style=draw,
		every label/.style=draw
	]
	\node [label={[label distance=1cm]30:label}] {Node};
\end{tikzpicture}

\end{document}

elem-simple_computations_pentagon+elem+style.tex

% from Helmund slides
\documentclass[tikz,border=10pt]{standalone}
%\documentclass[crop, tikz]{standalone}

\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
	\tikzstyle{every node} = [draw, shape=circle];
	\node (v0) at (0:    0) {$v_0$};
	\node (v1) at (0:    1) {$v_1$};
	\node (v2) at (72:   1) {$v_2$};
	\node (v3) at (2*72: 1) {$v_3$};
	\node (v4) at (3*72: 1) {$v_4$};	
	\node (v5) at (4*72: 1) {$v_5$};
	
	% draw the edges
	\draw (v0) -- (v1);
	\draw (v0) -- (v2);
	\draw (v0) -- (v3);
	\draw (v0) -- (v4);
	\draw (v0) -- (v5);
\end{tikzpicture}

\end{document}

elem-stacked+elem+diagram.tex

\documentclass[border=10pt]{standalone}
% arr: reindent
\usepackage{tikz}
\usetikzlibrary{shapes.multipart}

\begin{document}

\begin{tikzpicture}
	[
		stack/.style={rectangle split, 
			rectangle split parts=#1,
			draw, 
			anchor=center}
	]

	\node[stack=5]  {
		\nodepart{two}a
		\nodepart{three}b
		\nodepart{four}c
		\nodepart{five}d
	};
\end{tikzpicture}

\end{document}

elem-system_measurement_model+elem+diagram.tex

% https://tex.stackexchange.com/a/239506/173708
\documentclass{standalone}

\usepackage{tikz}       
\usetikzlibrary{arrows, positioning, patterns, calc, decorations.pathmorphing}

\begin{document}

\tikzstyle{block} = [draw, rectangle, inner sep=6pt, minimum width=2cm, minimum height=1cm, align=center]
\tikzstyle{joint} = [draw, circle, minimum size=1em, anchor=center]
\tikzstyle{layer} = [draw, rectangle, dashed, fill=gray!20, minimum width=7cm, minimum height=8mm, align=center, anchor=center]

\begin{tikzpicture}
    [
        >=stealth, 
        auto, 
        node distance=2cm
    ]
    
    % Place nodes
    \node [block] (system) {System};
    \node [block, below=of system] (model) {Model};
    \node [layer] at ($(system)!.5!(model)$) {\textsc{Measurement}};
    \coordinate [left=of system] (infork) {};
    \coordinate [left=of infork] (input) {};
    \coordinate [right=of system] (outfork) {};
    \coordinate [right=of outfork] (output) {};
    \coordinate [above=of system] (disturbances) {};
    \node [joint, label={[inner sep=1pt]210:\tiny\(+\)}, label={[inner sep=1pt]60:\tiny\(-\)}] (sum) at (outfork|-model) {};
    \coordinate (error) at (output|-model) {};
    % Connect nodes
    \draw [->, decorate, decoration={snake, post length=1mm}] (disturbances) -- node {\(d'\)} (system);
    \draw [->] (input) -- node {\(u'\)} (system);
    \draw [->] (system) -- node {\(t'\)} (output);
    \draw [->] (model) -- node {\(y\)} (sum);
    \draw [->] (sum) -- node {\(\epsilon\)} (error);
    \draw [->] (infork) |- node [anchor=south west] {\(u\)} (model);
    \draw [->] (outfork) -| (sum.north) node [very near end] {\(t\)};
\end{tikzpicture}

\end{document}

elem-text_boxes_helpme+elem+diagram+text.tex

% +arr: add circles to nodes

\documentclass[tikz, margin=3mm]{standalone}
    \usetikzlibrary{positioning, shapes.symbols}

\begin{document}
\begin{tikzpicture}
	[ 
   	node distance = 4mm and 16mm,
	   mynode/.style = {shape=signal, 
	   	signal to=west and east,
		draw, color = #1,
		text width=1.3cm, 
		align=flush center, 
		inner xsep=0mm, 
		inner ysep=2mm, 
		font=\small}
	]
	% main nodes
	\node (A) [mynode=magenta]            {Text 2};
	\node (B) [mynode=blue, below=of A]   {Text 3};
	\node (C) [mynode=teal, below=of B]   {Text 4};
	
	% coordinates for lines
	\coordinate[left=of B.west]     (in2);
	\coordinate[left=of in2]        (in1);
	\coordinate[right=of B.east]    (out1);
	\coordinate[right=of out1]      (out2);
	
	% add circles to nodes
	\draw (in1) circle (3pt);
	\draw (in2) circle (3pt);
	\draw (out1) circle (3pt);
	\draw (out2) circle (3pt);
	
	% dashed arrows
	\begin{scope}[latex-, dashed, shorten >=1mm]
		\draw[magenta] (A.west) -- + (-0.8,0) -- (in2);
		\draw[blue]     (B.west) -- (in2);
		\draw[magenta] (C.west) -- + (-0.8,0) -- (in2);
	\end{scope}
	
	\begin{scope}[-latex, dashed, shorten >=1mm]
		\draw[magenta] (A.east) -- + (0.8,0) -- (out1);
		\draw[blue]     (B.east) -- (out1);
		\draw[magenta] (C.east) -- + (0.8,0) -- (out1);
	\end{scope}
	    
	% arrows with text
	\draw[-latex] (in1) -- node[above] {Text 1} (in2);
	\draw[-latex] (out1) -- node[above] {Text 5} (out2);
	%--------------
\end{tikzpicture}
\end{document}

elem-tikz-01+elem+geometry.tex

\documentclass[border=10pt]{standalone}
\usepackage{tikz}

\begin{document}

We are working on
\begin{tikzpicture}
	\draw (-1.5,0) -- (1.5,0);
	\draw (0,-1.5) -- (0,1.5);
\end{tikzpicture}
\end{document}

elem-tikz-02+elem+geometry.tex

\documentclass[tikz,border=15pt]{standalone}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
	\filldraw [gray] (0,0) circle (2pt)
	(1,1) circle (2pt)
	(2,1) circle (2pt)
	(2,0) circle (2pt);
	\draw (0,0) .. controls (1,1) and (2,1) .. (2,0);
\end{tikzpicture}

\end{document}

elem-transparent_circles+multi+pgf+set.tex

% https://tex.stackexchange.com/a/48596/173708
\documentclass{scrartcl}

\usepackage{tikz}
\usetikzlibrary{calc}  

% split figures into pages
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{1pt}%

\begin{document} 

% If their areas of the circle nodes represent some numbers with proportionality 
% then you need to know exactly the radius. The radius depends of minimum width 
% and of \pgflinewidth.
%
% we have : radius = (minimum width + line width) / 2  if inner sep = 0pt
%
% In the next example, I choice first minimum width=2cm then minimum width=2cm,
% line width=5mm and finally line width=5mm,minimum width=2cm-\pgflinewidth 
% with in all cases inner sep= 0 pt.
%

	
\begin{tikzpicture} 
  \draw[help lines,step=0.1,,draw=orange] (0,0) grid (8,1); 
  \draw[help lines] (0,0) grid (8,1);     
  \node[minimum width=2cm,circle,inner sep=0pt,fill=blue!20,fill opacity=.5]{};
  \node[minimum width=2cm,circle,inner sep=0pt,fill=blue!20,fill opacity=.5,
        line width=5mm,draw=gray,opacity=.5] at (3,0){}; 
  \node[circle,inner sep=0pt,fill=blue!20,,fill opacity=.5,
        line width=5mm,draw=gray,opacity=.5,minimum width=2cm-\pgflinewidth]  at (6,0) {}; 
\end{tikzpicture}  

% Now if I want to get three circles with areas equal to pi, 2pi and 3pi 
% I created a macro `def\lw{2mm}` to change quickly the line width in all nodes

\tikzset{myrad/.style 2 args={circle,inner sep=0pt,minimum width=(2*(sqrt(#1)*1 cm ) - \pgflinewidth,fill=#2,draw=#2,fill opacity=.5,opacity=.8}}    

\begin{tikzpicture} 
	\def\lw{2mm}
	\draw[help lines,step=0.1,,draw=orange] (0,0) grid (8,1); 
	\draw[help lines] (0,0) grid (8,1);     
	\node[line width=\lw,myrad={1}{blue!20}]  at (0,0) {1}; 
	\node[line width=\lw,myrad={2}{red!20}]  at (3,0) {2};
	\node[line width=\lw, myrad={3}{green!20}]  at (7,0) {3};   
\end{tikzpicture}  

% Finally If you want nodes with areas equal to 1 cm^2, 2 cm^2 and 3 cm^2 : 
% I change the line width for the second group of nodes

\begin{tikzpicture} 
	\def\lw{2mm}
	\draw[help lines,step=0.1,,draw=orange] (0,0) grid (8,1); 
	\draw[help lines] (0,0) grid (8,1);     
	\node[line width=\lw,myrad={1}{blue!20}]  at (0,0) {1}; 
	\node[line width=\lw,myrad={2}{red!20}]  at (3,0) {2};
	\node[line width=\lw, myrad={3}{green!20}]  at (7,0) {3};   
\end{tikzpicture}    

\begin{tikzpicture} 
	\def\lw{5mm}
	\draw[help lines,step=0.1,,draw=orange] (0,0) grid (8,1); 
	\draw[help lines] (0,0) grid (8,1);     
	\node[line width=\lw,myrad={1}{blue!20}]  at (0,0) {1}; 
	\node[line width=\lw,myrad={2}{red!20}]  at (3,0) {2};
	\node[line width=\lw, myrad={3}{green!20}]  at (7,0) {3};   
\end{tikzpicture}

%To avoid this kind of problem, we can use circles instead of circle nodes. But we need to adjust the radius wit the pgflinewidth. In the next example,I want a radius = 2cm so I need to use : radius=2cm-0.5\pgflinewidth. Then I need to create a node with the same dimensions.
%
%Like the question about node and rectangle here, we can associate a node to the shape The main problem : we can't use scale but it's more easy to place a label.

\tikzset{set node/.style={insert path={% 
	\pgfextra{% 
		\node[inner sep=0pt,outer sep = 0pt,draw=black, % draw= none only to show what I do
		circle,
		minimum width=2*\pgfkeysvalueof{/tikz/x radius}+0.5\pgflinewidth](#1) {};
}}}}

\begin{tikzpicture}
	\draw[help lines] (-3,-3) grid (3,3);
	\draw[blue,line width=5mm,opacity=.2] (0,0) circle [radius=2cm-0.5\pgflinewidth,set node=C1]  ; 
	\draw[thick,->] (3,-3) -- (C1.east);
\end{tikzpicture}

\end{document}

elem-trapezium+elem+geometry.tex

%\documentclass{standalone}
\documentclass[tikz,border=15pt]{standalone}
%\documentclass[crop, tikz]{standalone}

\usepackage{tikz}
\usetikzlibrary{shapes}

\begin{document}
	
\tikzset{my node/.style={trapezium, fill=#1!20, draw=#1!75, text=black}}

\begin{tikzpicture}
	\tikzset{trapezium stretches=true}
	
	\draw [help lines] grid (3,2);
	
	% draw trapeziums
	\node [my node=red] {A};
	\node [my node=green, minimum height=1.5cm] at (1, 1.25) {B};
	\node [my node=blue, minimum width=1.5cm] at (2, 0) {C};
\end{tikzpicture}
	
\end{document}

eng-machanical_system.tex

% http://blog.jakob-wankel.de/2017/01/25/drawing-a-mechanical-system-with-tikz-in-latex/
\documentclass[border=15pt]{standalone}

\usepackage{tikz}
\usetikzlibrary{calc,patterns,decorations.pathmorphing,decorations.markings}


\begin{document}

\begin{tikzpicture}
	\tikzstyle{spring}=[thick,decorate,decoration={zigzag,pre length=0.3cm,post length=0.3cm,segment length=6}]
	\tikzstyle{damper}=[thick,decoration={markings,  
		mark connection node=dmp,
		mark=at position 0.5 with 
		{
			\node (dmp) [thick,inner sep=0pt,transform shape,rotate=-90,minimum width=15pt,minimum height=3pt,draw=none] {};
			\draw [thick] ($(dmp.north east)+(2pt,0)$) -- (dmp.south east) -- (dmp.south west) -- ($(dmp.north west)+(2pt,0)$);
			\draw [thick] ($(dmp.north)+(0,-5pt)$) -- ($(dmp.north)+(0,5pt)$);
		}
	}, decorate]
	\tikzstyle{ground}=[fill,pattern=north east lines,draw=none,minimum width=0.75cm,minimum height=0.3cm]

	\node (M) [draw,outer sep=0pt,thick,minimum width=1cm, minimum height=2cm] {$m_1$};
	\node (M2) [draw,outer sep=0pt,thick,minimum width=1cm, minimum height=2cm] at (2,0) {$m_2$};
	\node (M3) [draw,outer sep=0pt,thick,minimum width=1cm, minimum height=2cm] at (4,0) {$m_3$};
	\node (M4) [draw,outer sep=0pt,thick,minimum width=1cm, minimum height=2cm] at (6,0) {$m_4$};

	\node (ground) [ground,anchor=north,xshift=3cm,yshift=-0.25cm,minimum width=9.5cm] at (M.south) {};

	\draw (ground.north east) -- (ground.north west);
	\draw [thick] (M.south west) ++ (0.2cm,-0.125cm) circle (0.125cm)  (M.south east) ++ (-0.2cm,-0.125cm) circle (0.125cm);
	\draw [thick] (M2.south west) ++ (0.2cm,-0.125cm) circle (0.125cm)  (M2.south east) ++ (-0.2cm,-0.125cm) circle (0.125cm);
	\draw [thick] (M3.south west) ++ (0.2cm,-0.125cm) circle (0.125cm)  (M3.south east) ++ (-0.2cm,-0.125cm) circle (0.125cm);
	\draw [thick] (M4.south west) ++ (0.2cm,-0.125cm) circle (0.125cm)  (M4.south east) ++ (-0.2cm,-0.125cm) circle (0.125cm);

	\draw [spring] (M2.220) -- ($(M.north east)!(M.220)!(M.south east)$);
	\draw [spring] (M3.220) -- ($(M2.north east)!(M2.220)!(M2.south east)$);
	\draw [spring] (M4.220) -- ($(M3.north east)!(M3.220)!(M3.south east)$);

	\draw [damper] (M2.170) -- ($(M.north east)!(M2.170)!(M.south east)$);
	\draw [damper] (M3.170) -- ($(M2.north east)!(M3.170)!(M2.south east)$);
	\draw [damper] (M4.170) -- ($(M3.north east)!(M4.170)!(M3.south east)$);

	\node at (1,.8) {$d_1$};
	\node at (3,.8) {$d_2$};
	\node at (5,.8) {$d_3$};

	\node at (1,-.8) {$k_1$};
	\node at (3,-.8) {$k_2$};
	\node at (5,-.8) {$k_3$};

\end{tikzpicture}

\end{document}

eng-quarter_car_model.tex

% https://tex.stackexchange.com/a/240917/173708
\documentclass[tikz,border=10pt]{standalone}
\usepackage{tikz}

\usetikzlibrary{arrows,calc,decorations.pathmorphing,positioning,decorations.markings}

\tikzset{
    % build the shaded rectangle
    shadedrec/.style={
        rectangle,
        draw=black,
        top color=gray,        % this is part of the shade
        bottom color=white,    % this is part of the shade
        shading angle={135},   % this is part of the shade
        text width=3cm,
        inner sep=1em,
        rounded corners=1.2ex,
        very thick,
        text centered},
    snake arrow/.style={
        decorate,
        decoration={zigzag,amplitude=3mm,segment length=5mm,post length=0mm}},
    damper/.style={
        very thick,
        decoration={markings,  
        mark connection node=dmp,
        mark=at position 0.5 with 
        {
            \node (dmp) [very thick,transform shape,text width=.3cm,rotate=-90,minimum height=3pt,draw=none, fill=black,outer xsep=2pt, outer ysep=1pt] {};
            \draw [very thick] ($(dmp.north east)+(-.6pt,0)$) -- ($(dmp.south east)+(-.6pt,0)$) -- ($(dmp.south west)+(-.6pt,0)$) -- ($(dmp.north west)+(-.6pt,0)$);
            \draw [very thick,rotate=-90] ($(dmp.north)+(0,-5pt)$) -- ($(dmp.north)+(0,5pt)$);
        }
    }, decorate}
}

\begin{document}
\pagestyle{empty}

\begin{tikzpicture}
    % Shapes
    \node[shadedrec, anchor=center] (S1) at (4,3) {$M$};
    \node[shadedrec, anchor=center, below=2 of S1] (S2) {$m$};

    %Nodes side
    \node[anchor=center,text centered,right=2cm of S1.east] (sm) {Sprung mass};
    \node[below=of sm] (susp) {Suspension};
    \node[below=of susp] (usm) {Unsprung mass};
    \node[below=of usm] {Tire};

    % Paths

    %side arrows
    \draw[->,very thick] (S1.west) -- ++ (-1.5,0) -- ++ (0,-1.5) node[below] {$Z$};
    \draw[->,very thick] (S2.west) -- ++ (-1.5,0) -- ++ (0,-1.5) node[below] {$Z_u$};

    %zigzag lines
    \draw[very thick, snake arrow] ($(S1.south west)!.5!(S1.south)$) -- ++ (0,-2) node[left,midway,xshift=-1em] {$K_s$};
    \draw[very thick, snake arrow] (S2.south) -- ++ (0,-2) 
        node[left,midway,xshift=-1em] {$K_t$};

    %Connector shape
    \draw[damper] ($(S2.north east)!.5!(S2.north)$) -- ($(S1.south east)!.5!(S1.south)$) node[right,midway,xshift=1em] {$C_s$};

    % Road
    \coordinate (A) at ($(S2.west)+(5.5,-2.45)$);
    \draw[->,very thick] (A) -- ++(-7,0) -- ++ (0,-1.5) node[below] {$Z_r$};

    \begin{scope}[shift={($(S2.west)+(-1.5,-2.45)$)}]
        \foreach \x in {0.5,1,...,7} { %This one draws the little diagonal lines
        \draw (\x,0) -- ({\x-.5},-.5);
        }
    \end{scope} 
\end{tikzpicture}

\end{document}

eng-spring_mass.tex

% https://tex.stackexchange.com/a/13952/173708
\documentclass[border=15pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc,patterns,decorations.pathmorphing,decorations.markings}

\begin{document}

\begin{tikzpicture}[every node/.style={draw,outer sep=0pt,thick}]
  \tikzstyle{spring}=[thick,decorate,decoration={zigzag,pre length=0.3cm,post length=0.3cm,segment length=6}]
  \tikzstyle{damper}=[thick,decoration={markings,  
    mark connection node=dmp,
    mark=at position 0.5 with 
    {
      \node (dmp) [thick,inner sep=0pt,transform shape,rotate=-90,minimum width=15pt,minimum height=3pt,draw=none] {};
      \draw [thick] ($(dmp.north east)+(2pt,0)$) -- (dmp.south east) -- (dmp.south west) -- ($(dmp.north west)+(2pt,0)$);
      \draw [thick] ($(dmp.north)+(0,-5pt)$) -- ($(dmp.north)+(0,5pt)$);
    }
  }, decorate]

  \tikzstyle{ground}=[fill,pattern=north east lines,draw=none,minimum width=0.75cm,minimum height=0.3cm]

  \node (M) [minimum width=3.5cm,minimum height=2cm] {mass, $m$};

  \node (ground1) at (M.south) [ground,yshift=-1.5cm,xshift=-1.25cm,anchor=north] {};
  \draw (ground1.north west) -- (ground1.north east);
  \draw [spring] (ground1.north) -- ($(M.south east)!(ground1.north)!(M.south west)$);

  \node (ground2) at (M.south) [ground,yshift=-1.5cm,anchor=north] {};
  \draw (ground2.north west) -- (ground2.north east);
  \draw [damper] (ground2.north) -- ($(M.south east)!(ground2.north)!(M.south west)$);

  \node (ground3) at (M.south) [ground,yshift=-1.5cm,xshift=1.25cm,anchor=north] {};
  \draw (ground3.north west) -- (ground3.north east);
  \draw [spring] (ground3.north) -- ($(M.south east)!(ground3.north)!(M.south west)$);

  \draw [-latex,ultra thick] (M.north) ++(0,0.2cm) -- +(0,1cm);

  \begin{scope}[xshift=7cm]
    \node (M) [minimum width=1cm, minimum height=2.5cm] {$m$};

    \node (ground) [ground,anchor=north,yshift=-0.25cm,minimum width=1.5cm] at (M.south) {};
    \draw (ground.north east) -- (ground.north west);
    \draw [thick] (M.south west) ++ (0.2cm,-0.125cm) circle (0.125cm)  (M.south east) ++ (-0.2cm,-0.125cm) circle (0.125cm);

    \node (wall) [ground, rotate=-90, minimum width=3cm,yshift=-3cm] {};
    \draw (wall.north east) -- (wall.north west);

    \draw [spring] (wall.170) -- ($(M.north west)!(wall.170)!(M.south west)$);
    \draw [damper] (wall.10) -- ($(M.north west)!(wall.10)!(M.south west)$);

    \draw [-latex,ultra thick] (M.east) ++ (0.2cm,0) -- +(1cm,0);
  \end{scope}
\end{tikzpicture}

\end{document}

fileIO-airfoil_from_data.tex

% http://www.texample.net/tikz/examples/airfoil-profiles/
% Read airfoils from data files
% Airfoil profiles from the UIUC Airfoil Coordinates Database
% http://www.ae.uiuc.edu/m-selig/ads/coord_database.html
% Data is released under the GNU General Public Licence. See
% http://www.ae.uiuc.edu/m-selig/pd/gpl.html for more details. 
\documentclass{standalone}

\usepackage{tikz}
\usepackage{verbatim}

\begin{comment}
:Title: Airfoil profiles
:Tags: Plots, External file, Foreach

A few airfoil profiles from the extensive `UIUC Airfoil Coordinates Database`_. The data
is provided in a convenient x,y coordinate format suitable for plotting using PGF/TikZ's
``plot file`` construct.

Note that the data is released under the `GNU General Public License`_. To use the
data files with PGF/TikZ, you have to comment out the lines not containing coordinates.

Download the airfoils used in the example: `airfoildata.zip`_

.. _UIUC Airfoil Coordinates Database: http://www.ae.uiuc.edu/m-selig/ads/coord_database.html
.. _GNU General Public License: http://www.ae.uiuc.edu/m-selig/pd/gpl.html
.. _airfoildata.zip: http://www.fauskes.net/media/pgftikzexamples/data/airfoildata.zip
\end{comment}

\begin{document}

\newcounter{y}
\setcounter{y}{0}

\begin{tikzpicture}
    % read all the data files. Don't set the data folder here
    % read the label \lbl and the filename \fn with the for loop
    \foreach \lbl / \fn in {EPPLER 625/e625.dat,
                            WORTMANN FX 2/fx2.dat,
                            EPPLER 664 (EXTENDED)/e664ex.dat,
                            CLARK Y/clarcy.dat,
                            Eiffel 10 (Wright)/eiffel10.dat,
                            FX 69-PR-281/fx69pr281.dat,
                            NACA Munk M-4 airfoil/m4.dat}
    {
        % Some profiles look better when using plot[smooth]
        \draw[yshift=-\arabic{y}cm,scale=3] node[left=0.5cm] {\lbl}
        % set the data folder in the next line
        plot file{data/\fn} -- cycle;
        \stepcounter{y}
    }
\end{tikzpicture}

\end{document}

fileIO-circles_from_data.tex

% https://tex.stackexchange.com/a/20500/173708
\documentclass{standalone}
% arr: reindenting
\usepackage{tikz}
\usepackage{pgfplotstable}

\begin{document}
\centering
\begin{tikzpicture}
	\pgfplotstableread{./data/circles.dat}\table   % read the data table
	\pgfplotstablegetrowsof{\table}
	\pgfmathsetmacro{\M}{\pgfplotsretval-1}
	\pgfplotstablegetcolsof{\table}
	\pgfmathsetmacro{\N}{\pgfplotsretval-1}
	
	\foreach \row in {0,...,\M}{       % read the table rows
		\foreach \col in {0,...,\N}{   % read the columns
			\pgfplotstablegetelem{\row}{[index]\col}\of\table
			\ifnum\col=0
				\xdef\x{\pgfplotsretval}
			\fi
			\ifnum\col=1
				\xdef\y{\pgfplotsretval}
			\fi
			\ifnum\col=2
				\xdef\radius{\pgfplotsretval}
			\fi
		}
		\definecolor{mycolor}{RGB}{
			\pdfuniformdeviate 256,%
			\pdfuniformdeviate 256,%
			\pdfuniformdeviate 256}
		\fill[mycolor,opacity=.5] (\x,\y)circle(\radius cm);
	}
\end{tikzpicture}
\end{document}

fileIO-plot_curves-read_data+fileio+plot+pgf.tex

% http://pgfplots.net/media/tikz/examples/TEX/plot-markers.tex
\documentclass[border=10pt]{standalone}
%%%<
\usepackage{verbatim}
\usepackage{pgfplots}
\pgfplotsset{width=7cm, compat=1.8, grid style={dashed}}

\begin{comment}
:Title: Markers in a line diagram
:Tags: 2D;Markers
:Author: Elke Schubert
:Slug: plot-markers

Besides x and y values, special markers illustrate the result.

This topic was discussed on: http://texwelt.de/wissen/fragen/3363/

Data file
-------
if you want the data to be saved as you modify this file, add this above the comments:

	\usepackage{filecontents}
	
	% changes in this table make changes to CSV file
	\begin{filecontents}{data.csv}
	measuring   power1   result1   power2   result2
	1           2        0.2       3.5      0.39
	2           3        0.35      3.8      0.3
	3           4        0.45      7.9      0.35
	4           5        0.5       8.5      0.39
	5           6        0.65      8.0      0.38
	6           7        0.68      8.5      0.4
	7           8        0.7       9.5      0.41
	8           7.5      0.73      10.5     0.99
	9           6.7      0.75      {}       {}
	10          10       0.79      {}       {}
	\end{filecontents}
	%%%>

\end{comment}

\begin{document}
\begin{tikzpicture}
  \begin{axis}
    [
      scatter,
      scatter src = explicite,
      grid        = major, % draws coordinate grid
      xlabel      = Force $\lbrack{}$ F $\rbrack$, 
      ylabel      = Amperage $\lbrack{}$ kA $\rbrack$,
      width       = \linewidth,
      height      = 10cm,
      xmin = 0, xmax = 15,
      ymin = 0, ymax = 12,
    ]
    \addplot+ [
      visualization depends on =
        {10*\thisrow{result1} \as \perpointmarksize},
      scatter/@pre marker code/.append style =
        {/tikz/mark size = \perpointmarksize},
    ]
    % read the table
    % read the column result1
    table[x=measuring, y=power1, point meta=\thisrow{result1}] {./data/data.csv};
    \addplot+ [
      visualization depends on =
        {10*\thisrow{result2} \as \perpointmarksize},
      scatter/@pre marker code/.append style =
        {/tikz/mark size = \perpointmarksize}
    ]
    % read the column result2
    table [x=measuring, y=power2, point meta=\thisrow{result2}] {./data/data.csv};
    \fill [gray, fill opacity=0.25] (axis cs:5,0) rectangle (axis cs:7,12);
  \end{axis}
\end{tikzpicture}
\end{document}

fileIO-plot-two_plots_same_axis+fileio+pgf.tex

\documentclass[border=10pt]{standalone}

\usepackage{pgfplots}
\pgfplotsset{compat=newest}

\begin{document}

% Preamble: \pgfplotsset{width=7cm,compat=newest}
\begin{tikzpicture}
    \begin{axis}
	    [
			height=9cm,
			width=9cm,
			grid=major,
	    ]
	    % \addplot gnuplot[id=filesuffix]{(-x**5 - 242)};
	    \addlegendentry{model}
		    
		    \addplot coordinates {
			    (-4.77778,2027.60977)
			    (-3.55556,347.84069)
			    (-2.33333,22.58953)
			    (-1.11111,-493.50066)
			    (0.11111,46.66082)
			    (1.33333,-205.56286)
			    (2.55556,-341.40638)
			    (3.77778,-1169.24780)
			    (5.00000,-3269.56775)
			    };
		    \addlegendentry{estimate}
	    \end{axis}
    \end{tikzpicture}

\end{document}

fileIO-simple_read_coordinates.tex

\documentclass{standalone}
\usepackage{pgfplots}
\pgfplotsset{compat=1.11}

\begin{document}
\begin{tikzpicture}
    \begin{axis}
        \addplot table {./data/coordinates.dat};
    \end{axis}
\end{tikzpicture}
\end{document}

fileIO-table-read_data+fileio+pgf+table.tex

% http://pgfplots.net/media/tikz/examples/TEX/graph-in-table.tex
% arr: reindent
\documentclass[border=10pt]{standalone}
%%%<
\usepackage{verbatim}

\begin{comment}

Data file
-------
if you want the data to be saved as you modify this file, add this above comments:

	\usepackage{filecontents}
	
	\begin{filecontents}{./data/data.txt}
	name z p mean lci uci
	Afear -0.96  0.33 -0.42 -1.28 0.49
	Anofear 0.09 0.93 0.04 -0.85 0.94
	B+2 0.29 0.78 0.10 -0.59 0.79
	B+1   0.84  0.40  0.30 -0.40 1.00 
	B1:1   2.19  0.03  0.80 0.08 1.52 
	B-1   1.02  0.31  0.37 -0.33 1.07 
	B-2   -0.10  0.92  -0.03 -0.72 0.65 
	C+2   -1.11  0.27  -0.30 -0.83 0.23 
	C+1   1.15   0.25  0.32 -0.22 0.86 
	C1:1   -1.34  0.18  -0.38 -0.93 0.17 
	C-1   0.43  0.67  0.12 -0.42 0.66 
	C-2   -0.37  0.71  -0.10 -0.63 0.43 
	D+2   0.41  0.68  0.12 -0.44 0.67 
	D+1   -0.69  0.49  -0.20 -0.77 0.37 
	D1:1   -1.33  0.18  -0.39 -0.97 0.19 
	D-1   -1.21  0.23  -0.35 -0.92 0.22 
	D-2   0.32  0.75  0.09 -0.46 0.65 
	\end{filecontents}
	%%%>
\end{comment}


\usepackage{pgfplots}
\pgfplotsset{compat=1.8}
\usepackage{pgfplotstable}
\usepackage{booktabs}
\usepackage{multirow}

\begin{comment}
:Title: Graph within a table
:Tags: 2D;PGFPlotstable;Styles
:Author: Jake
:Slug: graph-in-table

We would like to plot a graph within a table column, similar to
http://texample.net/tikz/examples/weather-stations-data/ .

We will use the booktabs package for good table design,
and the multirow package.

The data is read using PGFPlotstable and the plot is typeset dynamically.

This code was written by Jake on TeX.SE.
\end{comment}

% Read data file, create new column ``upper CI boundary - mean''
\pgfplotstableread{./data/data.txt}\data
\pgfplotstableset{create on use/error/.style={
    create col/expr={\thisrow{uci}-\thisrow{mean}
    }
  }
}

% Define the command for the plot
\newcommand{\errplot}{%
  \begin{tikzpicture}[trim axis left,trim axis right]
    \begin{axis}[y=-\baselineskip,
        scale only axis,
        width             = 6.5cm,
        enlarge y limits  = {abs=0.5},
        axis y line*      = middle,
        y axis line style = dashed,
        ytick             = \empty,
        axis x line*      = bottom
      ]
      % ``mean'' must be present in the datafile,
      %``error'' is the newly generated column
      \addplot+[only marks][error bars/.cd,x dir=both, x explicit]
        table [x=mean,y expr=\coordindex,x error=error]{\data};
    \end{axis}
  \end{tikzpicture}%
}

\begin{document}
% Get number of rows in datafile
\pgfplotstablegetrowsof{\data}
\let\numberofrows=\pgfplotsretval

% Print the table
\pgfplotstabletypeset
  [
    columns={name,error,z,p,mean,ci},
    % Booktabs rules
    every head row/.style = {before row=\toprule, after row=\midrule},
    every last row/.style = {after row=[3ex]\bottomrule},
    % Set header name
    columns/name/.style = {string type, column name=Name},
    % Use the ``error'' column to call the \errplot command in a multirow cell
    % in the first row, keep empty for all other rows
    columns/error/.style = {
      column name = {},
      assign cell content/.code = {% use \multirow for Z column:
      \ifnum\pgfplotstablerow=0
        \pgfkeyssetvalue{/pgfplots/table/@cell content}
        {\multirow{\numberofrows}{6.5cm}{\errplot}}%
      \else
        \pgfkeyssetvalue{/pgfplots/table/@cell content}{}%
      \fi
      }
    },
    % Format numbers and titles
    columns/mean/.style = {column name = Mean, fixed ,fixed zerofill, dec sep align},
    columns/z/.style    = {column name = $z$, fixed, fixed zerofill, dec sep align},
    columns/p/.style    = {column name = $p$, fixed, fixed zerofill, dec sep align},
    columns/ci/.style   = {string type, column name = 95\% CI},
    % Create the ``(x to y)'' format, use \pgfmathprintnumber with `showpos`
    % to make things align nicely
    create on use/ci/.style={
    create col/assign/.code={\edef\value{(
      \noexpand\pgfmathprintnumber[showpos,fixed,fixed zerofill]{\thisrow{lci}}
      to \noexpand\pgfmathprintnumber[showpos,fixed,fixed zerofill]{\thisrow{uci}})}
      \pgfkeyslet{/pgfplots/table/create col/next content}\value
      }
    }
  ]
{\data}
\end{document}

fileIO-time-read-data+timeline+fileio+pgf+foreach+text.tex

% https://tex.stackexchange.com/a/457351/173708
\documentclass[border=10pt]{standalone}
\usepackage{verbatim}


\begin{comment}

Data file
-------
if you want the data to be saved as you modify this file, add this:

\usepackage{filecontents}

\begin{filecontents*}{events.csv}
X,Y,Event,Date
0,0,Abbotsford,January 1
3,0,Surrey,April 1
5,1,Vancouver,June 1
6,0,New\ Westminster,July 1
10,0,North\ Vancouver,November 1
0.75,4,Ended\ High\ School,Jan 26
3.3,4,Started\ Trade\ School,April 10
5.8,4,Ended\ Trade\ School,June 28
8,4,Started\ Job\ 1,Sept 1
10.8,4,Started\ Job\ 2,Nov 27
\end{filecontents*}
%%%>
\end{comment}

\usepackage{tikz}
\usepackage{pgfplotstable}
\pgfplotstableread[col sep=comma]{./data/events.csv}\data  %  in ./data folder
% from https://tex.stackexchange.com/a/445369/121799
\newcommand*{\ReadOutElement}[4]{%
    \pgfplotstablegetelem{#2}{#3}\of{#1}%
    \let#4\pgfplotsretval
}


%only necessary for overset
\usetikzlibrary{positioning}
\usepackage{makecell}%
\usetikzlibrary{patterns}

\begin{document}

\begin{tikzpicture}[node distance =2mm]

   % draw horizontal line
   \draw (0,0) coordinate (baseLine) -- (11,0);

   % draw vertical lines and label below with months
   \foreach \varXcoord/\varMonth [count=\xx] in {
      0/Jan,
      1/Feb,
      2/Mar,
      3/Apr,
      4/May,
      5/Jun,
      6/Jul,
      7/Aug,
      8/Sep,
      9/Oct,
      10/Nov,
      11/Dec
   }
      \draw (\varXcoord,3pt) -- +(0,-6pt) node (qBaseTick\xx) [below] {\varMonth};

   \fill [pattern=north west lines, pattern color=yellow] (-1,0) rectangle (12.5,4); 

   \node [above left = 2.5 and 1 of baseLine,rotate=90] 
   {
   Location
   };

   \fill [pattern=north west lines, pattern color=orange] (-1,4) rectangle (12.5,8); 

   \node [above left = 7 and 1 of baseLine,rotate=90] 
   {
   Career
   };

   \pgfplotstablegetrowsof{\data}
   \pgfmathtruncatemacro{\rownumber}{\pgfplotsretval-1}
   \foreach \X in {0,...,\rownumber}
   {
         \ReadOutElement{\data}{\X}{X}{\varXcoord}
         \ReadOutElement{\data}{\X}{Y}{\varYcoord}
         \ReadOutElement{\data}{\X}{Event}{\varEvent}
         \ReadOutElement{\data}{\X}{Date}{\varDate}
         \draw[<-] (\varXcoord,0) -- (\varXcoord,\varYcoord+0.5);
         \node [above right = \varYcoord and \varXcoord + 0.5 of baseLine, rotate=45, anchor=south west] {\makecell[l]{\small${\varEvent}$\\\tiny \varDate}};
   }
\end{tikzpicture}

\end{document}

flow-android_lifecycle+block+style+learn.tex

% Diagram of Android activity life cycle
% Author: Pavel Seda 
\documentclass[border=10pt]{standalone}
%%%<
\usepackage{verbatim}
%%%>
\begin{comment}
:Title: Diagram of Android activity life cycle
:Tags: Diagrams;Flowcharts;Charts;Styles;Computer science
:Author: Pavel Seda
:Slug: android

A flow diagram of an Android activity life cycle.
It uses basic nodes and arrows and defines node styles.
\end{comment}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}

\tikzset{%
  >={Latex[width=2mm,length=2mm]},
  % Specifications for style of nodes:
            base/.style = {rectangle, rounded corners, draw=black,
                           minimum width=4cm, minimum height=1cm,
                           text centered, font=\sffamily},
  activityStarts/.style = {base, fill=blue!30},
       startstop/.style = {base, fill=red!30},
    activityRuns/.style = {base, fill=green!30},
         process/.style = {base, minimum width=2.5cm, fill=orange!15,
                           font=\ttfamily},
}
\begin{document}    
% Drawing part, node distance is 1.5 cm and every node
% is prefilled with white background
\begin{tikzpicture}[node distance=1.5cm,
      every node/.style={fill=white, font=\sffamily}, align=center]
    % Specification of nodes (position, etc.)
    \node (start)             [activityStarts]              {Activity starts};
    \node (onCreateBlock)     [process, below of=start]          {onCreate()};
    \node (onStartBlock)      [process, below of=onCreateBlock]   {onStart()};
    \node (onResumeBlock)     [process, below of=onStartBlock]   {onResume()};
    \node (activityRuns)      [activityRuns, below of=onResumeBlock]
                                                        {Activity is running};
    \node (onPauseBlock)      [process, below of=activityRuns, yshift=-1cm]
                                                                  {onPause()};
    \node (onStopBlock)       [process, below of=onPauseBlock, yshift=-1cm]
                                                                  {onStop()};
    \node (onDestroyBlock)    [process, below of=onStopBlock, yshift=-1cm] 
                                                                {onDestroy()};
    \node (onRestartBlock)    [process, right of=onStartBlock, xshift=4cm]
                                                                {onRestart()};
    \node (ActivityEnds)      [startstop, left of=activityRuns, xshift=-4cm]
                                                          {Process is killed};
    \node (ActivityDestroyed) [startstop, below of=onDestroyBlock]
                                                      {Activity is shut down};     
    % Specification of lines between nodes specified above
    % with aditional nodes for description 
    \draw[->]             (start) -- (onCreateBlock);
    \draw[->]     (onCreateBlock) -- (onStartBlock);
    \draw[->]      (onStartBlock) -- (onResumeBlock);
    \draw[->]     (onResumeBlock) -- (activityRuns);
    \draw[->]      (activityRuns) -- node[text width=4cm]
                                    {Another activity comes in
                                      front of the activity} (onPauseBlock);
    \draw[->]      (onPauseBlock) -- node {The activity is no longer visible}
                                    (onStopBlock);
    \draw[->]       (onStopBlock) -- node {The activity is shut down by
                                    user or system} (onDestroyBlock);
    \draw[->]    (onRestartBlock) -- (onStartBlock);
    \draw[->]       (onStopBlock) -| node[yshift=1.25cm, text width=3cm]
                                    {The activity comes to the foreground}
                                    (onRestartBlock);
    \draw[->]    (onDestroyBlock) -- (ActivityDestroyed);
    \draw[->]      (onPauseBlock) -| node(priorityXMemory)
                                    {higher priority $\rightarrow$ more memory}
                                    (ActivityEnds);
    \draw           (onStopBlock) -| (priorityXMemory);
    \draw[->]     (ActivityEnds)  |- node [yshift=-2cm, text width=3.1cm]
                                      {User navigates back to the activity}
                                      (onCreateBlock);
    \draw[->] (onPauseBlock.east) -- ++(2.6,0) -- ++(0,2) -- ++(0,2) --                
      node[xshift=1.2cm,yshift=-1.5cm, text width=2.5cm]
      {The activity comes to the foreground}(onResumeBlock.east);
  \end{tikzpicture}
\end{document}

flow-direction_of_arrival+diagram+matrrix+table.tex

% Direction-of-arrival diagram
% Author: Edgar Fuentes
\documentclass{article}
\usepackage{tikz}
%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{10pt}%
%%%>
\begin{comment}
:Title: Direction-of-arrival diagram
:Tags: Diagrams;Styles;
:Author: Edgar Fuentes
:Slug: doa-diagram

This diagram explains a spatial filter with direction of arrival estimation.
\end{comment}
\usetikzlibrary{shapes.geometric}
\usetikzlibrary{shapes.arrows}
\usepackage{array}

\begin{document}
\begin{tikzpicture} [
    auto,
    decision/.style = { diamond, draw=blue, thick, fill=blue!20,
                        text width=5em, text badly centered,
                        inner sep=1pt, rounded corners },
    block/.style    = { rectangle, draw=blue, thick, 
                        fill=blue!20, text width=10em, text centered,
                        rounded corners, minimum height=2em },
    line/.style     = { draw, thick, ->, shorten >=2pt },
  ]
  % Define nodes in a matrix
  \matrix [column sep=5mm, row sep=10mm] {
                    & \node [text centered] (x) {$\mathbf{X}$};            & \\
                    & \node (null1) {};                                    & \\
                    & \node [block] (doa) {\textsf{DoAE}($\mathbf{X}$)};   & \\
   			 		\node(null3){}; & \node [decision] (uiddes)
                        {\textsf{UID}($\hat{\mathbf{X}}$)};
                                  & \node[text centered](tra){$\mathbf{i}$}; \\
                    & \node [block] (track) {\textsf{DoAT}($\mathbf{x}$)}; & \\
                    & \node [block] (pesos)
                        {\textsf{BF}(DoA$_{\mathrm{T}}$,DoAs)};            & \\
                    & \node [block] (filtrado)
                        {\textsf{SF}($\mathbf{w}$,$\mathbf{x}$)};          & \\
                    & \node [text centered] (xf) {$\hat{x}(t)$ };          & \\
  };
  % connect all nodes defined above
  \begin{scope} [every path/.style=line]
    \path (x)        --    (doa);
    \path (doa)      --    node [near start] {DoAs} (uiddes);
    \path (tra)      --    (uiddes);
    \path (uiddes)   --++  (-3,0) node [near start] {no} |- (null1);
    \path (uiddes)   --    node [near start] {DoA} (track);
    \path (track)    --    node [near start] {DoA$_{\mathrm{T}}$} (pesos);
    \path (pesos)    --    node [near start] {\textbf{w}} (filtrado);
    \path (filtrado) --    (xf);
  \end{scope}
  %
  % legend for subprocedures
  \node (leyend) at (7.5, 5){
    \begin{tabular}{>{\sffamily}l@{: }l}
      \multicolumn{2}{c}{\textbf{subprocedures}} \\
      DoAE & direction of arrival estimation     \\
      UID  & user identification                 \\
      DoAT & DoA tracking                        \\
      BF   & beam forming                        \\
      SF   & spatial filtering
    \end{tabular}
  };
  %
  % legend for input and output variables
  \node (leyend) at (7, 0){
    \begin{tabular}{l@{: }l}
      \multicolumn{2}{c}{\textbf{variables}}              \\
      DoA                       & direction of arrival    \\
      $\mathbf{i}$              & identification sequence \\
      $\mathbf{X},\,\mathbf{x}$ & signal model            \\
      DoA$_{\mathrm{T}}$        & DoAs up to date         \\
      $\hat{x}(t)$              & fitered signal
      \end{tabular}
  };
\end{tikzpicture}
\end{document}

flow-easy_flowchart+diagram.tex

% Flowcharting techniques for easy maintenance
% Author: Brent Longborough
\documentclass[x11names]{article}
\usepackage{tikz}
\usetikzlibrary{shapes,arrows,chains}
%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5mm}%
%%%>
\begin{comment}
:Title: Easy-maintenance flowchart
:Tags: flowcharts
:Author: Brent Longborough
:Slug: flexible-flow-chart

  This TikZ example illustrates a number of techniques for making TikZ
  flowcharts easier to maintain:
    * Use of <on chain> and <on grid> to simplify positioning
    * Use of global <node distance> options to eliminate the need to 
      specify individual inter-node distances
    * Use of <join> to reduce the need for references to node names
    * Use of <join by> styles to tailor specific connectors
    * Use of <coordinate> nodes to provide consistent layout for
      parallel flow lines
    * A method for consistent annotation of decision box exits
    * A technique for marking coordinate nodes (for layout debugging)

    I encourage you to tinker at this file - add intermediate boxes,
    alter the global distance settings, and so on, to see how well (or
    ill!) it adapts.
\end{comment}
\begin{document}
% =================================================
% Set up a few colours
\colorlet{lcfree}{Green3}
\colorlet{lcnorm}{Blue3}
\colorlet{lccong}{Red3}
% -------------------------------------------------
% Set up a new layer for the debugging marks, and make sure it is on
% top
\pgfdeclarelayer{marx}
\pgfsetlayers{main,marx}
% A macro for marking coordinates (specific to the coordinate naming
% scheme used here). Swap the following 2 definitions to deactivate
% marks.
\providecommand{\cmark}[2][]{%
  \begin{pgfonlayer}{marx}
    \node [nmark] at (c#2#1) {#2};
  \end{pgfonlayer}{marx}
  } 
\providecommand{\cmark}[2][]{\relax} 
% -------------------------------------------------
% Start the picture
\begin{tikzpicture}[%
    >=triangle 60,              % Nice arrows; your taste may be different
    start chain=going below,    % General flow is top-to-bottom
    node distance=6mm and 60mm, % Global setup of box spacing
    every join/.style={norm},   % Default linetype for connecting boxes
    ]
  % ------------------------------------------------- 
  % A few box styles 
  % <on chain> *and* <on grid> reduce the need for manual relative
  % positioning of nodes
  \tikzset{
    base/.style={draw, on chain, on grid, align=center, minimum height=4ex},
    proc/.style={base, rectangle, text width=8em},
    test/.style={base, diamond, aspect=2, text width=5em},
    term/.style={proc, rounded corners},
    % coord node style is used for placing corners of connecting lines
    coord/.style={coordinate, on chain, on grid, node distance=6mm and 25mm},
    % nmark node style is used for coordinate debugging marks
    nmark/.style={draw, cyan, circle, font={\sffamily\bfseries}},
    % -------------------------------------------------
    % Connector line styles for different parts of the diagram
    norm/.style={->, draw, lcnorm},
    free/.style={->, draw, lcfree},
    cong/.style={->, draw, lccong},
    it/.style={font={\small\itshape}}
  }
  % -------------------------------------------------
  % Start by placing the nodes
  \node [proc, densely dotted, it] (p0) {New trigger message thread};
  % Use join to connect a node to the previous one 
  \node [term, join]      {Trigger scheduler};
  \node [proc, join] (p1) {Get quota $k > 1$};
  \node [proc, join]      {Open queue};
  \node [proc, join]      {Dispatch message};
  \node [test, join] (t1) {Got msg?};
  % No join for exits from test nodes - connections have more complex
  % requirements
  % We continue until all the blocks are positioned
  \node [proc] (p2) {$k \mathbin{{-}{=}} 1$};
  \node [proc, join] (p3) {Dispatch message};
  \node [test, join] (t2) {Got msg?};
  \node [test] (t3) {Capacity?};
  \node [test] (t4) {$k \mathbin{{-}{=}} 1$};
  % We position the next block explicitly as the first block in the
  % second column.  The chain 'comes along with us'. The distance
  % between columns has already been defined, so we don't need to
  % specify it.
  \node [proc, fill=lcfree!25, right=of p1] (p4) {Reset congestion};
  \node [proc, join=by free] {Set \textsc{mq} wait flag};
  \node [proc, join=by free] (p5) {Dispatch message};
  \node [test, join=by free] (t5) {Got msg?};
  \node [test] (t6) {Capacity?};
  % Some more nodes specifically positioned (we could have avoided this,
  % but try it and you'll see the result is ugly).
  \node [test] (t7) [right=of t2] {$k \mathbin{{-}{=}} 1$};
  \node [proc, fill=lccong!25, right=of t3] (p8) {Set congestion};
  \node [proc, join=by cong, right=of t4] (p9) {Close queue};
  \node [term, join] (p10) {Exit trigger message thread};
  % -------------------------------------------------
  % Now we place the coordinate nodes for the connectors with angles, or
  % with annotations. We also mark them for debugging.
  \node [coord, right=of t1] (c1)  {}; \cmark{1}   
  \node [coord, right=of t3] (c3)  {}; \cmark{3}   
  \node [coord, right=of t6] (c6)  {}; \cmark{6}   
  \node [coord, right=of t7] (c7)  {}; \cmark{7}   
  \node [coord, left=of t4]  (c4)  {}; \cmark{4}   
  \node [coord, right=of t4] (c4r) {}; \cmark[r]{4}
  \node [coord, left=of t7]  (c5)  {}; \cmark{5}   
  % -------------------------------------------------
  % A couple of boxes have annotations
  \node [above=0mm of p4, it] {(Queue was empty)};
  \node [above=0mm of p8, it] {(Queue was not empty)};
  % -------------------------------------------------
  % All the other connections come out of tests and need annotating
  % First, the straight north-south connections. In each case, we first
  % draw a path with a (consistently positioned) annotation node, then
  % we draw the arrow itself.
  \path (t1.south) to node [near start, xshift=1em] {$y$} (p2);
    \draw [*->,lcnorm] (t1.south) -- (p2);
  \path (t2.south) to node [near start, xshift=1em] {$y$} (t3); 
    \draw [*->,lcnorm] (t2.south) -- (t3);
  \path (t3.south) to node [near start, xshift=1em] {$y$} (t4); 
    \draw [*->,lcnorm] (t3.south) -- (t4);
  \path (t5.south) to node [near start, xshift=1em] {$y$} (t6); 
    \draw [*->,lcfree] (t5.south) -- (t6);
  \path (t6.south) to node [near start, xshift=1em] {$y$} (t7); 
    \draw [*->,lcfree] (t6.south) -- (t7); 
  % ------------------------------------------------- 
  % Now the straight east-west connections. To provide consistent
  % positioning of the test exit annotations, we have positioned
  % coordinates for the vertical part of the connectors. The annotation
  % text is positioned on a path to the coordinate, and then the whole
  % connector is drawn to its destination box.
  \path (t3.east) to node [near start, yshift=1em] {$n$} (c3); 
    \draw [o->,lccong] (t3.east) -- (p8);
  \path (t4.east) to node [yshift=-1em] {$k \leq 0$} (c4r); 
    \draw [o->,lcnorm] (t4.east) -- (p9);
  % -------------------------------------------------
  % Finally, the twisty connectors. Again, we place the annotation
  % first, then draw the connector
  \path (t1.east) to node [near start, yshift=1em] {$n$} (c1); 
    \draw [o->,lcfree] (t1.east) -- (c1) |- (p4);
  \path (t2.east) -| node [very near start, yshift=1em] {$n$} (c1); 
    \draw [o->,lcfree] (t2.east) -| (c1);
  \path (t4.west) to node [yshift=-1em] {$k>0$} (c4); 
    \draw [*->,lcnorm] (t4.west) -- (c4) |- (p3);
  \path (t5.east) -| node [very near start, yshift=1em] {$n$} (c6); 
    \draw [o->,lcfree] (t5.east) -| (c6); 
  \path (t6.east) to node [near start, yshift=1em] {$n$} (c6); 
    \draw [o->,lcfree] (t6.east) -| (c7); 
  \path (t7.east) to node [yshift=-1em] {$k \leq 0$} (c7); 
    \draw [o->,lcfree] (t7.east) -- (c7)  |- (p9);
  \path (t7.west) to node [yshift=-1em] {$k>0$} (c5); 
    \draw [*->,lcfree] (t7.west) -- (c5) |- (p5);
  % -------------------------------------------------
  % A last flourish which breaks all the rules
  \draw [->,MediumPurple4, dotted, thick, shorten >=1mm]
    (p9.south) -- ++(5mm,-3mm)  -- ++(27mm,0) 
    |- node [black, near end, yshift=0.75em, it]
      {(When message + resources available)} (p0);
  % -------------------------------------------------
\end{tikzpicture}
% =================================================
\end{document}

flow-flowchart_video+diagram+style.tex

% https://github.com/FriendlyUser/LatexDiagrams
\documentclass{standalone}

\usepackage{tikz}
\usetikzlibrary{arrows.meta,
                calc, chains,
                quotes,
                positioning,
                shapes.geometric}

\begin{document}

\begin{tikzpicture}[
    node distance = 8mm and 16mm,
      start chain = A going below,
      base/.style = {draw, minimum width=32mm, minimum height=8mm,
                     align=center, on chain=A},
 startstop/.style = {base, rectangle, rounded corners, fill=red!30},
   process/.style = {base, rectangle, fill=orange!30},
        io/.style = {base, trapezium, 
                     trapezium left angle=70, trapezium right angle=110,
                     fill=blue!30},
  decision/.style = {base, diamond, fill=green!30},
  every edge quotes/.style = {auto=right}]
                    ]
  \node [startstop]       {Read Video};            % <-- A-1
  \node [process]         {Extract Frames};
  \node [io]              {Read Frame};
  \node [decision]        {Completed?};
  \node [process]         {Save Watermarked Video};
  \node [process]         {Stop};             % <-- A-6
  %
  \node [process,                             % <-- A-7
        right=of A-4]    {Get Next Frame};
  %%
  \draw [arrows=-Stealth] 
      (A-1) edge["read data"]          (A-2)
      (A-2) edge["get watermark"]    (A-3)
      (A-3) edge[text width=3cm,"apply watermark to all frames "]       (A-4)
      (A-4) edge["yes"]            (A-5)
      (A-5) edge["exit"]          (A-6)
      (A-4) edge["no"']          (A-7)       % <-- by ' is swapped label position
      (A-7) |- ($(A-2.south east)!0.5!(A-3.north east)$)
            -| ([xshift=7mm] A-3.north)
      ;
  \end{tikzpicture}
\end{document}

flow-labs_class+diagram+style+pgf+command.tex

% Schema of Labs on a class
% Author: Cristo J. Alanis
\documentclass[11pt]{article}
\usepackage{tikz} 
%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>
\begin{comment}
:Title: Schema of Labs on a class
:Tags: Shadows;Styles;Backgrounds;Diagrams
:Author: Cristo J. Alanis
:Slug: labs-schema

Listado de pr\'acticas
\end{comment}
\usetikzlibrary{shadows,arrows}
% Define the layers to draw the diagram
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}
 
% Define block styles  
\tikzstyle{materia}=[draw, fill=blue!20, text width=6.0em, text centered,
  minimum height=1.5em,drop shadow]
\tikzstyle{practica} = [materia, text width=8em, minimum width=10em,
  minimum height=3em, rounded corners, drop shadow]
\tikzstyle{texto} = [above, text width=6em, text centered]
\tikzstyle{linepart} = [draw, thick, color=black!50, -latex', dashed]
\tikzstyle{line} = [draw, thick, color=black!50, -latex']
\tikzstyle{ur}=[draw, text centered, minimum height=0.01em]
 
% Define distances for bordering
\newcommand{\blockdist}{1.3}
\newcommand{\edgedist}{1.5}

\newcommand{\practica}[2]{node (p#1) [practica]
  {Pr\'actica #1\\{\scriptsize\textit{#2}}}}

% Draw background
\newcommand{\background}[5]{%
  \begin{pgfonlayer}{background}
    % Left-top corner of the background rectangle
    \path (#1.west |- #2.north)+(-0.5,0.5) node (a1) {};
    % Right-bottom corner of the background rectanle
    \path (#3.east |- #4.south)+(+0.5,-0.25) node (a2) {};
    % Draw the background
    \path[fill=yellow!20,rounded corners, draw=black!50, dashed]
      (a1) rectangle (a2);
    \path (a1.east |- a1.south)+(0.8,-0.3) node (u1)[texto]
      {\scriptsize\textit{Unidad #5}};
  \end{pgfonlayer}}

\newcommand{\transreceptor}[3]{%
  \path [linepart] (#1.east) -- node [above]
    {\scriptsize Transreceptor #2} (#3);}

\begin{document}
\begin{tikzpicture}[scale=0.7,transform shape]
 
  % Draw diagram elements
  \path \practica {1}{Diferencias en componentes electr\'onicos};
  \path (p1.south)+(0.0,-1.0) \practica{2}{Serie de Fourier};
  \path (p2.south)+(-2.5,-1.5) \practica{3}{Antena para HF};
  \path (p3.south)+(0.0,-1.0) \practica{5}{Medidor de SWR};
  \path (p3.south)+(5.0,-1.0) \practica{4}{Amplificador para HF};

  \path (p4.south)+(-2.5,-1.5) \practica{6}{Oscilador de RF};
  \path (p6.south)+(-2.5,-1.25) \practica{7}{Modulador AM};
  \path (p6.south)+(2.5,-1.25) \practica{8}{Demodulador AM};
  \path (p8.east)+(+5.5,0) node (ur1)[ur] {};

  \path (p7.south)+(0.0,-1.5) \practica{9}{Codificador digital};
  \path (p8.south)+(0.0,-1.5) \practica{10}{Decodificador digital};
  \path (p10.east)+(+5.5,0) node (ur2)[ur] {};
  \path (p9.south)+(0.0,-1.5) \practica{11}{Codificador FDM};
  \path (p10.south)+(0.0,-1.5) \practica{12}{Decodificador FDM};
  \path (p12.east)+(+5.5,0) node (ur3)[ur] {};
  \path (p11.south)+(0.0,-1.5) \practica{13}{Codificador SSTV};
  \path (p12.south)+(0.0,-1.5) \practica{14}{Decodificador SSTV};
  \path (p14.east)+(+5.5,0) node (ur4)[ur] {};
  \path (p14.south)+(-2.5,-1.5) \practica{15}{Conmutaci\'on telef\'onica};
  \path (p15.south)+(0.0,-1.0) \practica{16}{Telfon\'ia celular an\'aloga};
  \path (p16.south)+(0.0,-1.5) \practica{17}{Receptor de  telemetr\'ia}; 
  \path (p17.south)+(0.0,-1.5) \practica{18}{Gu\'ias de ondas};
     
  % Draw arrows between elements
  \path [line] (p1.south) -- node [above] {} (p2);

  \path [line] (p2.south) -- +(0.0,-0.5) -- +(-2.5,-0.5)
    -- node [above, midway] {} (p3);
  \path [line] (p3.south) -- node [above] {} (p5) ;
     
  \path [line] (p2.south) -- +(0.0,-0.5) -- +(+2.5,-0.5)
    -- node [above, midway] {} (p4);
  \path [linepart] (p3.east) -- +(+0.5,-0.0) -- +(+0.5,-1.75)
    -- node [left, midway] {} (p4);
  \path [linepart] (p3.east) -- +(+0.5,-0.0) -- +(+0.5,-1.75)
    -- node [left, midway] {} (p4);

  \path [line] (p4.south) -- +(0.0,-0.5) -- +(-2.5,-0.5)
    -- node [above, midway] {} (p6);
  \path [line] (p5.south) -- +(0.0,-0.5) -- +(+2.5,-0.5)
    -- node [above, midway] {} (p6);     
  \path [linepart] (p2.east) -- +(2.75,0.0) -- +(2.75,-5.85)
    -- node [right] {} (p6);
  \path [line] (p6.south) -- +(0.0,-0.25) -- +(-2.5,-0.25)
    -- node [above, midway] {} (p7);
  \path [line] (p6.south) -- +(0.0,-0.25) -- +(+2.5,-0.25)
    -- node [above, midway] {} (p8);
  \path [linepart] (p7.east) -- node [left] {} (p8);
  \transreceptor{p8}{AM banda 40m}{ur1}

  \path [line] (p7.south) -- node [above] {} (p9) ;
  \path [line] (p8.south) -- node [above] {} (p10) ;
  \path [linepart] (p9.east) -- node [left] {} (p10);
  \transreceptor{p10}{CW}{ur2}
  \path [line] (p9.south) -- node [above] {} (p11) ;
  \path [line] (p10.south) -- node [above] {} (p12) ;
  \path [linepart] (p11.east) -- node [left] {} (p12);
  \transreceptor{p12}{FDMDV}{ur3}

  \path [line] (p11.south) -- node [above] {} (p13) ;
  \path [line] (p12.south) -- node [above] {} (p14) ;
  \path [linepart] (p13.east) -- node [left] {} (p14);   
  \transreceptor{p14}{SSTV}{ur4}

  \path [line] (p14.south) -- +(0.0,-0.5) -- +(-2.5,-0.5)
    -- node [above, midway] {} (p15);
  \path [line] (p13.south) -- +(0.0,-0.5) -- +(+2.5,-0.5)
    -- node [above, midway] {} (p15);
  \path [line] (p15.south) -- node [above] {} (p16) ;     
  \path [line] (p16.south) -- node [above] {} (p17) ;
  \path [line] (p17.south) -- node [above] {} (p18) ;
   
  \background{p3}{p1}{p4}{p2}{I}
  \background{p3}{p3}{p4}{p5}{II}
  \background{p3}{p6}{p4}{p7}{III}
  \background{p3}{p9}{p4}{p10}{IV}
  \background{p3}{p11}{p4}{p12}{V}
  \background{p3}{p13}{p4}{p14}{VI}
  \background{p3}{p15}{p4}{p16}{VII}
  \background{p3}{p17}{p4}{p17}{VIII}
  \background{p3}{p18}{p4}{p18}{IX}
\end{tikzpicture}
\end{document}

flow-report_diagrams+diagram+learn+style.tex

\documentclass{standalone}

\usepackage{tikz}
\usetikzlibrary{arrows.meta,
                calc, chains,
                quotes,
                positioning,
                shapes.geometric}

\begin{document}

\begin{tikzpicture}[
    node distance = 8mm and 16mm,
      start chain = A going below,
      base/.style = {draw, minimum width=32mm, minimum height=8mm,
                     align=center, on chain=A},
 startstop/.style = {base, rectangle, rounded corners, fill=red!30},
   process/.style = {base, rectangle, fill=orange!30},
        io/.style = {base, trapezium, 
                     trapezium left angle=70, trapezium right angle=110,
                     fill=blue!30},
  decision/.style = {base, diamond, fill=green!30},
  every edge quotes/.style = {auto=right}]
                    ]
  \node [startstop]       {Read Video};            % <-- A-1
  \node [process]         {Extract Frames};
  \node [io]              {Read Frame};
  \node [decision]        {Completed?};
  \node [process]         {Save Watermarked Video};
  \node [process]         {Stop};             % <-- A-6
  %
  \node [process,                             % <-- A-7
        right=of A-4]    {Get Next Frame};
  %%
  \draw [arrows=-Stealth] 
      (A-1) edge["read data"]          (A-2)
      (A-2) edge["get watermark"]    (A-3)
      (A-3) edge[text width=3cm,"apply watermark to all frames "]       (A-4)
      (A-4) edge["yes"]            (A-5)
      (A-5) edge["exit"]          (A-6)
      (A-4) edge["no"']          (A-7)       % <-- by ' is swapped label position
      (A-7) |- ($(A-2.south east)!0.5!(A-3.north east)$)
            -| ([xshift=7mm] A-3.north)
      ;
  \end{tikzpicture}
\end{document}

gears_simple+foreach.tex

\documentclass[border=3mm,tikz]{standalone}
%\documentclass[11pt]{scrartcl}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}
	\draw[thick]
	\foreach \i in {1,2,...,10} {%
		[rotate=(\i-1)*36] 
		(0:2)  arc (0:18:2) {[rounded corners=2pt] -- ++(18: 0.3)  arc (18:36:2.3) } -- ++(36: -0.3) 
	};
\end{tikzpicture}
\end{document}

gears+pgf+def.tex

% https://tex.stackexchange.com/a/299454/173708
% takes 40 seconds to compile
\documentclass[tikz,margin=10pt]{standalone}

\tikzset{pics/gear/.style n args={3}{
    code={
        \def\modu{#1}
        \def\Zb{#2}
        \def\AngleA{#3}

        \pgfmathsetmacro{\Rpr}{\Zb*\modu/2}
        \pgfmathsetmacro{\Rb}{\Rpr*cos(\AngleA)}
        \pgfmathsetmacro{\Rt}{\Rpr+\modu}
        \pgfmathsetmacro{\Rp}{\Rpr-1.25*\modu}
        \pgfmathsetmacro{\AngleT}{pi/180*acos(\Rb/\Rt)}
        \pgfmathsetmacro{\AnglePr}{pi/180*acos(\Rb/\Rpr)}
        \pgfmathsetmacro{\demiAngle}{180/\Zb}
        \pgfmathsetmacro{\Angledecal}{(\demiAngle-2*\AnglePr)/2}

        \path[pic actions] foreach \zz in{1,...,\Zb}{
            \ifnum\zz=1
                % don't use a lineto in the first iteration
                (\zz/\Zb*360-\Angledecal:\Rp)
            \else
                -- (\zz/\Zb*360-\Angledecal:\Rp)
            \fi
            to[bend right=\demiAngle]
            (\zz/\Zb*360+\Angledecal:\Rp)
            --
            plot[domain=-0:\AngleT,smooth,variable=\t]
                ({{180/pi*(-\t+tan(180/pi*\t)) +\zz/\Zb*360+\Angledecal}:\Rb/cos(180/pi*\t)})
            %
            to[bend right=\demiAngle]
                ({{180/pi*(\AngleT+tan(180/pi*-\AngleT)) +(\zz+1)/\Zb*360-\Angledecal}:
                \Rb/cos(180/pi*-\AngleT)})
            --
            plot[domain=-\AngleT:-0,smooth,variable=\t]
            ({{180/pi*(-\t+tan(180/pi*\t)) +(\zz+1)/\Zb*360-\Angledecal}:\Rb/cos(180/pi*\t)})
        } -- cycle;
    }
}}

\begin{document}
\begin{tikzpicture}
    % observations:
    %
    %  - param #1 and #3 must be equal for gears to mesh
    %  - the required distance is (#2_1 + #2_2) * #1 / 2
    %  - for odd numbers of teeth, gears on a horizontal axis fit without rotation

    \pic[draw,fill=red!20!white]                     at (0,0)   {gear={0.50}{17}{15}};
    \pic[draw,fill=red!20!white]                     at (6,0)   {gear={0.50}{ 7}{15}};

    \pic[draw,fill=blue!20!white,rotate=-60 + 90/11] at (0,0)   {gear={0.25}{11}{20}};
    \pic[draw,fill=blue!20!white,rotate=-60 - 90/29] at (-60:5) {gear={0.25}{29}{20}};

    \foreach \p in {(0,0),(6,0),(-60:5)} \fill \p circle (3pt);
\end{tikzpicture}
\end{document}

geom-circle_bisectors_triangle+geometry.tex

% Perpendicular bisectors of a triangle
% Author: Sam Britt
\documentclass[tikz,border=10pt]{standalone}
%%%<
\usepackage{verbatim}
%%%>
\begin{comment}
:Title: Perpendicular bisectors of a triangle
:Tags: Coordinate calculations;Foreach;Mathematical engine;Geometry;Mathematics
:Author: Sam Britt
:Slug: bisector

A perpendicular bisector of a line segment is a line which is perpendicular
to this line and passes through its midpoint. This drawing shows
perpendicular bisectors of a triangle. They meet in the center of the
circumcircle of the triangle.

This example was written by Sam Britt answering a question on TeX.SE.
\end{comment}

\usetikzlibrary{calc}
\begin{document}

\begin{tikzpicture}
  [
    scale=3,
    >=stealth,
    point/.style = {draw, circle,  fill = black, inner sep = 1pt},
    dot/.style   = {draw, circle,  fill = black, inner sep = .2pt},
  ]

  % the circle
  \def\rad{1}
  \node (origin) at (0,0) [point, label = {below right:$P_c$}]{};
  \draw (origin) circle (\rad);

  % triangle nodes: just points on the circle
  \node (n1) at +(60:\rad) [point, label = above:$1$] {};
  \node (n2) at +(-145:\rad) [point, label = below:$2$] {};
  \node (n3) at +(-45:\rad) [point, label = {below right:$3$ $(0, 0, 0)$}] {};

  % triangle edges: connect the vertices, and leave a node at the midpoint
  \draw[->] (n3) -- node (a) [label = {above right:$\vec{v}_1$}] {} (n1);
  \draw[->] (n3) -- node (b) [label = {below right:$\vec{v}_2$}] {} (n2);
  \draw[dashed] (n2) -- (n1);

  % Bisectors
  % start at the point lying on the line from (origin) to (a), at
  % twice that distance, and then draw a path going to the point on
  % the line lying on the line from (a) to the (origin), at 3 times
  % that distance.
  \draw[dotted]
    ($ (origin) ! 2 ! (a) $)
    node [right] {Bisector 1}
    -- ($(a) ! 3 ! (origin)$ );

  % similarly for origin and b
  \draw[dotted]
    ($ (origin) ! 2 ! (b) $)
    -- ($(b) ! 3 ! (origin)$ )
    node [right] {Bisector 2};

  % short vectors
  \draw[->]
    ($ (origin) ! -.7 ! (a) $)
    -- node [below] {$\vec{u}_4$}
    ($ (origin) ! -.1 ! (a) $);
  \draw[->]
    ($ (origin) ! -.1 ! (b) $)
    -- node [right] {$\vec{u}_3$}
    ($ (origin) ! -.7 ! (b) $);

  % Right angle symbols
  \def\ralen{.5ex}  % length of the short segment
  \foreach \inter/\first/\last in {a/n3/origin, b/n2/origin}
    {
      \draw let \p1 = ($(\inter)!\ralen!(\first)$), % point along first path
                \p2 = ($(\inter)!\ralen!(\last)$),  % point along second path
                \p3 = ($(\p1)+(\p2)-(\inter)$)      % corner point
            in
              (\p1) -- (\p3) -- (\p2)               % path
              ($(\inter)!.5!(\p3)$) node [dot] {};  % center dot
    }
\end{tikzpicture}
\end{document}

geom-circle_coordinate_systems+geometry.tex

% https://github.com/PetarV-/TikZ/blob/master/Coordinate%20systems/coordinate_systems.tex
\documentclass[crop, tikz, border=10pt]{standalone}
\usepackage{tikz}

\usetikzlibrary{calc}

\definecolor{olivegreen}{rgb}{0,0.6,0}

\begin{document}
\begin{tikzpicture}[scale=0.85]
	% Axis
	\draw[thick,-stealth,black] (-3,0)--(3,0) coordinate (A) node[below] {$x$}; % x axis
	\draw[thick,-stealth,black] (0,-3)--(0,3) node[left] {$y$}; % y axis
	\draw[black,thin] (0,0) circle (2.5cm);
	
	\draw[ultra thick,red] (0,0) -- (60:2.5cm |- 0,0) node[midway,below] {$x$}; % UpOn y axis

	\draw (1,0) arc (0:60:1) node at ($(60/2:0.7)$) {$\alpha$};
	\draw[ultra thick, blue] (60:2.5cm) -- (60:2.5cm |- 0,0) node[midway,right] {$y$}; % vertical line

	\draw[ultra thick,olivegreen,rotate=60] (0,0) -- node [left] {$r$} (2.5,0) coordinate (B); 
    
	\draw[xshift=-1cm] (B) node[circle,fill,inner sep=1pt,label=above:$P$](e){};
\end{tikzpicture}
\end{document}

geom-ellipse_on_coords+geometry+pgf+def+script.tex

\documentclass[0pt]{article}
\usepackage{pgf,tikz}
\usepackage{mathrsfs}
\usetikzlibrary{arrows}

\pagestyle{empty}

\begin{document}

%\SweaveOpts{concordance=TRUE}
\definecolor{ududff}{rgb}{0.30196078431372547,0.30196078431372547,1}
\definecolor{cqcqcq}{rgb}{0.7529411764705882,0.7529411764705882,0.7529411764705882}

\begin{tikzpicture}[line cap=round,line join=round,>=triangle 45,x=1cm,y=1cm]
	\draw [color=cqcqcq,, xstep=1cm,ystep=1cm] (-11.22,-7.62) grid (8.54,8.3);
	\draw[->,color=black] (-11.22,0) -- (8.54,0);
	\foreach \x in {-11,-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,1,2,3,4,5,6,7,8}
	\draw[shift={(\x,0)},color=black] (0pt,2pt) -- (0pt,-2pt) node[below] {\footnotesize $\x$};
	\draw[->,color=black] (0,-7.62) -- (0,8.3);
	\foreach \y in {-7,-6,-5,-4,-3,-2,-1,1,2,3,4,5,6,7,8}
	\draw[shift={(0,\y)},color=black] (2pt,0pt) -- (-2pt,0pt) node[left] {\footnotesize $\y$};
	\draw[color=black] (0pt,-10pt) node[right] {\footnotesize $0$};
	\clip(-11.22,-7.62) rectangle (8.54,8.3);
	\draw [rotate around={-27.068368650285745:(-4.32,2.45)},line width=2pt] (-4.32,2.45) ellipse (4.618210097836655cm and 3.463721193710664cm);
	\draw (-4.98,-1.58) node[anchor=north west] {ellipse};
	\begin{scriptsize}
		\draw [fill=ududff] (-7.04,3.84) circle (2.5pt);
		\draw[color=ududff] (-6.85,4.35) node {$A$};
		\draw [fill=ududff] (-1.6,1.06) circle (2.5pt);
		\draw[color=ududff] (-1.41,1.57) node {$B$};
		\draw [fill=ududff] (-3.78,-1.26) circle (2.5pt);
		\draw[color=ududff] (-3.59,-0.75) node {$C$};
		\draw[color=black] (-5.11,6.09) node {$c$};
		\draw [fill=ududff] (-6.64,-1.24) circle (2.5pt);
		\draw[color=ududff] (-6.45,-0.73) node {$D$};
		\end{scriptsize}
\end{tikzpicture}
\end{document}

geom-euclides+geometry.tex

\documentclass{standalone}
%\documentclass[crop, tikz]{standalone}

\usepackage{tikz}

\begin{document}

% add packages 
\usetikzlibrary{calc,intersections,through,backgrounds}

\begin{tikzpicture}[thick,help lines/.style={thin, draw=black!50}]

    \def\A{\textcolor{input}{$A$}} 
    \def\B{\textcolor{input}{$B$}}
    \def\C{\textcolor{output}{$C$}} 
    \def\D{$D$}
    \def\E{$E$}

    % define colors
    \colorlet{input}{blue!80!black} 
    \colorlet{output}{red!70!black}
    \colorlet{triangle}{orange}

    \coordinate [label=left:\A] (A) at ($ (0,0) + .1*(rand,rand) $);
    \coordinate [label=right:\B] (B) at ($ (1.25,0.25) + .1*(rand,rand) $);

    \draw [input] (A) -- (B);

    \node [name path=D,help lines,draw,label=left:\D] (D) at (A) [circle through=(B)] {};
    \node [name path=E,help lines,draw,label=right:\E] (E) at (B) [circle through=(A)] {};

    \path [name intersections={of=D and E, by={[label=above:\C]C}}];

    \draw [output] (A) -- (C) -- (B);

    \foreach \point in {A,B,C}
    \fill [black, opacity=.25] (\point) circle (3pt);

    \begin{pgfonlayer}{background}
    \fill[triangle!80] (A) -- (C) -- (B) -- cycle;
    \end{pgfonlayer}

\end{tikzpicture}

\end{document}

geom-hyperbola+geometry+physics.tex

% https://wiki.physik.uzh.ch/cms/latex:tikz:hyperbola
    % Author: Izaak Neutelings (July, 2017)

\documentclass{article}
\usepackage{amsmath} % for \dfrac
\usepackage{tikz}
\tikzset{>=latex} % for LaTeX arrow head

\usepackage{pgfplots}                                     % for the axis environment

\usetikzlibrary{calc} % to do arithmetic with coordinates
\usetikzlibrary{angles,quotes} % for pic

% colors
\definecolor{mylightgrey}{RGB}{230,230,230}
\definecolor{mygrey}{RGB}{190,190,190}
\definecolor{mydarkgrey}{RGB}{110,110,110}
\definecolor{mygreen}{RGB}{120,220,160}
\definecolor{mydarkgreen}{RGB}{60,120,60}
\definecolor{myverydarkgreen}{RGB}{20,60,20}
\definecolor{mydarkred}{RGB}{140,40,40}

% mark right angle
\newcommand{\MarkRightAngle}[4][1.5mm]
{\coordinate (tempa) at ($(#3)!#1!(#2)$);
	\coordinate (tempb) at ($(#3)!#1!(#4)$);
	\coordinate (tempc) at ($(tempa)!0.5!(tempb)$);%midpoint
	\draw (tempa) -- ($(#3)!2!(tempc)$) -- (tempb);
}

% split figures into pages
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{1pt}%

\begin{document}
	
	
% RUTHERFORD SCATTERING - hyperbola orbit
\begin{tikzpicture}[scale=1]

	% limits & parameters
	\def\xa{-2.4}
	\def\xb{ 4}
	\def\ya{-4}
	\def\yb{ 4}
	\def\tmax{2.1}
	\def\a{1.3}
	\def\b{1}
	\def\c{{sqrt(\a^2+\b^2)}}
	\def\N{100} % number of points

	% coordinates
	\coordinate (O)  at (   0,  0 );
	\coordinate (A)  at (  \a,  0 );
	\coordinate (F1) at (  {sqrt(\a^2+\b^2)},   0 );
	\coordinate (F2) at ( -{sqrt(\a^2+\b^2)},   0 );
	\coordinate (P)  at ( -{\a^2/sqrt(\a^2+\b^2)}, -{\a*\b/sqrt(\a^2+\b^2)} );
	\coordinate (P1) at (\xb*\a, \yb*\b);
	\coordinate (P2) at (\xb*\a,-\yb*\b);
	\coordinate (yshift) at (0,0.4);

	% axes & asymptotes
	\draw[mygrey] % x axis
	(\xa*\a,0) -- (\xb*\a,0);
	\draw[dashed,mydarkgrey]
	(-\xb*\a*0.45, \ya*\b*0.45) -- (\xb*\a, \yb*\b)
	(-\xb*\a*0.45,-\ya*\b*0.45) -- (\xb*\a,-\yb*\b);

	% arrows
	\def\vtheta{30}
	\def\vradius{0.8}
	\draw[->,myverydarkgreen,shift=($(P1)-(yshift)$),scale=0.6]
	(0,0) -- (-\a,-\b) node[midway,below right=0pt] {${v}_i$};
	\draw[->,myverydarkgreen,shift=($(P2)+(yshift)$),scale=0.6]
	(-\a,\b) -- (0,0) node[midway,above right=-2pt] {${v}_f$};
	\draw[->,myverydarkgreen]
	(\a+0.35,{\vradius*sin(\vtheta)}) arc (180-\vtheta:180+\vtheta+10:\vradius)
	node[above right=0pt] {$v^*$};

	% angles
	\MarkRightAngle{F2}{P}{O}
	\pic [draw,myverydarkgreen,"$\theta$",angle radius=12,angle eccentricity=1.4] {angle = F2--O--P};
	\pic [draw,below,angle radius=16,angle eccentricity=1.4] {angle = P2--O--P1};
	\node[right=1pt,below=-2pt,myverydarkgreen] at ($(O)!0.5!(A)$)  {\small$\phi$};

	% hyperbola
	\draw[color=mylightgrey,line width=0.5,samples=\N,variable=\t,domain=-\tmax*0.58:\tmax*0.58] % left
	plot({-\a*cosh(\t)},{\b*sinh(\t)});
	\draw[color=mydarkgreen,line width=1,samples=\N,variable=\t,domain=-\tmax:\tmax] % right
	plot({ \a*cosh(\t)},{\b*sinh(\t)}); % {exp(\y)+exp(-\y)

	% nodes
	\draw[myverydarkgreen]
	(F2) -- (P) node[midway,below left=1pt,] {$b$};
	\fill[radius=1.5pt]
	(A)  circle node[above left=0pt] {A}
	(O)  circle node[above=2pt] {O};
	\fill[radius=2.5pt,mydarkred]
	(F2) circle node[above=2pt] {N};
	\draw[]
	%(O) -- (F2)
	node[left=1pt,above=0pt] at ($(F2)!0.5!(O)$) {$c$}
	node[below right] at ($(P)!0.5!(O)$)  {$a$};

	% alpha particle
	\draw[radius=1pt,mydarkgreen,fill]
	({ \a*cosh(\tmax*1.02)},{\b*sinh(\tmax*1.02)}) circle node[above right=0pt] {$\alpha$};

\end{tikzpicture}
	
	
% RUTHERFORD SCATTERING - hyperbolic orbits with different impact parameters
\begin{tikzpicture}[scale=1]

	% limits & parameters
	\def\xa{-35}
	\def\xb{ 55}
	\def\ya{ -1}
	\def\yb{ 55}
	\def\tmax{4.5}
	\def\N{50} % number of points

	% use axes to get square box which cuts of the long curves
	\begin{axis}[ xmin=\xa,xmax=\xb,
		ymin=\ya,ymax=\yb,
		hide x axis, hide y axis,
		xticklabels={,,},yticklabels={,,}
		axis line style={draw=none}, tick style={draw=none}
		]

		% loop over multiples \u of impact parameters \b=\u*0.25
		\def\a{1}
		\foreach \u in {1,3,6,10,15,21,28,38}{
			\def\b{\u*0.25}
			\def\c{sqrt(\a^2+\b^2)}
			% hyperbola
			\addplot[color=mydarkgreen,line width=0.5,samples=\N,smooth,variable=\t,domain=-\tmax:\tmax]
			({   \a/\c*(-\a*cosh(\t)-\c) + \b/\c*\b*sinh(\t)  },
			{  -\b/\c*(-\a*cosh(\t)-\c) + \a/\c*\b*sinh(\t)  });
		}

		% nucleus
		\addplot[mydarkred,mark=*,mark size=2pt,mark options=solid] coordinates {(0,0)};

	\end{axis}

\end{tikzpicture}
	
	
	
	
	
\end{document}

geometric_representation+math+foreach+pgf+scope.tex

% http://www.texample.net/media/tikz/examples/TEX/geometric-series.tex
% Geometric representation of the sum 1/4 + 1/16 + 1/64 + 1/256 + ...
% Author: Jimi Oke
\documentclass{article}
\usepackage{tikz}
%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>
\begin{comment}
:Title: Representation of a geometric series
:Tags: Foreach; Scopes
:Author: Jimi Oke
:Slug: geometric-series

The infinite series 1/4 + 1/16 + 1/64 + 1/256 + ... is one of the first computed infinite series in the history of mathematics, already used by Archimedes. Its sum is 1/3. 
\end{comment}
\begin{document}
\begin{tikzpicture}[scale=.35]\footnotesize
  \pgfmathsetmacro{\xone}{-.4}
  \pgfmathsetmacro{\xtwo}{ 16.4}
  \pgfmathsetmacro{\yone}{-.4}
  \pgfmathsetmacro{\ytwo}{16.4}

  \begin{scope}<+->;
    % grid
      \draw[step=1cm,gray,very thin] (\xone,\yone) grid (\xtwo,\ytwo);

    % ticks
      \foreach \x/\xtext in { 8/\frac{1}{2}, 16/1}
      \draw[gray,xshift=\x cm] (0,.3) -- (0,0) node[below] {$\xtext$};
      \foreach \y/\ytext in {8/\frac{1}{2},16/1}
        \draw[gray, yshift=\y cm] (.3,0) -- (0,0)
        node[left] {$\ytext$};

    % origin
    \draw[gray] (0,0) node[anchor=north east] {$O$};

    % axes
      \draw[gray,thick,<->] (\xone, 0) -- (\xtwo, 0) node[right] {$x$};
      \draw[gray,thick,<->] (0, \yone) -- (0, \ytwo) node[above] {$y$};
  \end{scope}

  % function
  \begin{scope}[thick,red]
    \foreach \x in {16, 8, 4, 2, 1,.5,.25}
      \draw (16-\x, 16-\x) rectangle (16,16);

    \foreach \x in {16, 8, 4, 2, 1,.5,.25}
    \filldraw[thin,red,opacity=.3] (16-\x, 16-\x)
      rectangle (16-.5*\x,16-.5*\x);

  \foreach \x in {16, 8, 4, 2, 1,.5,.25}{
    \filldraw[thin,blue,opacity=.2] (16-\x, 16-.5*\x)
      rectangle (16-.5*\x,16);
    \filldraw[thin,blue,opacity=.2] (16-.5*\x, 16-\x)
      rectangle (16,16-.5*\x);}
  \end{scope}
\end{tikzpicture}
\end{document}

git_dataflow+diagram.tex

% https://github.com/PetarV-/TikZ/blob/master/git%20dataflow/git_dataflow.tex
\documentclass[crop, tikz]{standalone}
\usepackage{tikz}

\usetikzlibrary{decorations.pathmorphing}

\definecolor{bluport}{HTML}{21ADFD}
\definecolor{orgport}{HTML}{E37322}
\definecolor{pplport}{HTML}{4F21E9}
\definecolor{redport}{HTML}{701315}

\begin{document}

\begin{tikzpicture}

	\fill[pplport!15] (0, 0) ellipse (0.25 and 3);
	\fill[redport!15] (2.75, -3) rectangle (3.25, 3);
	\fill[bluport!15] (6, 0) ellipse (0.25 and 3);
	\fill[orgport!15] (9, 0) ellipse (0.25 and 3);
	
	\draw[thick, pplport] (0, 0) ellipse (0.25 and 3);
	\draw[ultra thick, pplport, decorate, decoration={snake, segment length=1mm, amplitude=0.3mm}] (0, 0) ellipse (0.23 and 3.05);
	\node[text height=1em, text depth=1em, pplport] (1) at (0, -3.5) {\emph{stash}};
		
	\draw[ultra thick, redport] (2.75, -3) rectangle (3.25, 3);
	\node[text height=1em, text depth=1em, redport] (2) at (3, -3.5) {\emph{working directory}};
		
	\draw[thick, orgport] (9, 0) ellipse (0.25 and 3);
	\draw[ultra thick, orgport, decorate, decoration={snake, segment length=1mm, amplitude=0.3mm}] (9, 0) ellipse (0.23 and 3.05);
	\node[text height=1em, text depth=1em, orgport] (4) at (9, -3.5) {\emph{repository}};
	
	\draw[-stealth, very thick] (6, 2) -- node[above] {\tt\footnotesize git commit} (9, 2);
	\draw[-stealth, very thick] (9, 1) -- node[above] {\tt\footnotesize git checkout} (6, 1);
	\draw[-stealth, very thick] (9, 0) -- node[above] {\tt\footnotesize git reset} (6, 0);
	\draw[very thick] (6, -2) -- node[above] {\tt\scriptsize git diff -{}-staged} (9, -2);
	\draw[very thick] (3, -2.5) -- node[above, pos=0.75] {\tt\scriptsize git diff HEAD} (9, -2.5);
	\draw[-stealth, very thick] (9, -0.5) -- node[above, pos=0.25] {\tt\footnotesize git rebase} (3, -0.5);
	\draw[-stealth, very thick] (9, -1) -- node[above, pos=0.25] {\tt\footnotesize git merge} (3, -1);
	
	% draw the blue portal here for the portal effect
	\draw[thick, bluport] (6, 0) ellipse (0.25 and 3);
	\draw[ultra thick, bluport, decorate, decoration={snake, segment length=1mm, amplitude=0.3mm}] (6, 0) ellipse (0.23 and 3.05);
	\node[text height=1em, text depth=1em, bluport] (3) at (6, -3.5) {\emph{index}};
	
	% Redraw some lines for piercing effect through blu port
	\draw[-stealth, very thick] (6, -0.5) -- (3, -0.5);
	\draw[-stealth, very thick] (6, -1) -- (3, -1);	
	\draw[very thick] (3, -2.5) -- (6, -2.5);
	
	\draw[-stealth, very thick] (3, 2.5) -- node[above] {\tt\footnotesize git add/rm} (6, 2.5);
	\draw[-stealth, very thick] (3, 1.5) -- node[above] {\tt\footnotesize git stash save} (0, 1.5);
	\draw[-stealth, very thick] (6, 1) -- node[above] {\tt\footnotesize git checkout} (3, 1);
	\draw[-stealth, very thick] (0, 0.5) -- node[above] {\tt\footnotesize git stash pop} (3, 0.5);
	\draw[-stealth, very thick] (0, -0.5) -- node[above] {\tt\footnotesize git stash apply} (3, -0.5);
	\draw[very thick] (3, -1.5) -- node[above] {\tt\footnotesize git diff} (6, -1.5);
\end{tikzpicture}
\end{document}

git_workflow+diagram.tex

\documentclass[crop, tikz]{standalone}
\usepackage{tikz}

\usetikzlibrary{decorations.pathmorphing}

\definecolor{bluport}{HTML}{21ADFD}
\definecolor{orgport}{HTML}{E37322}
\definecolor{pplport}{HTML}{4F21E9}
\definecolor{redport}{HTML}{701315}

\begin{document}
\begin{tikzpicture}
	\draw[thick, bluport] (0, 0) ellipse (2 and 1);
	\draw[ultra thick, bluport, decorate, decoration={snake, segment length=1mm, amplitude=0.3mm}] (0, 0) ellipse (2 and 1);
	\node[text height=1em, text depth=1em] (1) at (0, 1.5) {\tt git init};
	\node[text height=1em, text depth=1em, align=center, bluport] (1) at (0, -0.25) {\tt ./git \\ repository};
		
	\draw[thick, orgport] (6, 0) ellipse (2 and 1);
	\draw[ultra thick, orgport, decorate, decoration={snake, segment length=1mm, amplitude=0.3mm}] (6, 0) ellipse (2 and 1);
	\node[text height=1em, text depth=1em] (1) at (6, 1.5) {\tt git clone};
	\node[text height=1em, text depth=1em, align=center, orgport] (1) at (6, -0.25) {\tt ./git \\ repository};
		
	\draw[ultra thick, redport] (-1.75, -2) rectangle (1.75, -3.5);
	\node[text height=1em, text depth=1em, align=center, redport] (1) at (0, -3.25) {working directory \\ \& index of user 1};
		
	\draw[ultra thick, pplport] (4.25, -2) rectangle (7.75, -3.5);
	\node[text height=1em, text depth=1em, align=center, pplport] (1) at (6, -3.25) {working directory \\ \& index of user 2};
		
	\draw[very thick, stealth-stealth] (1.5, 0) -- node[above] {\tt git pull} node[below] {\tt git push} (4.5, 0);
		
	\draw[very thick, -stealth] (-0.2, -0.5) -- node[left] {\tt git pull} (-0.2, -2.4);
	\draw[very thick, -stealth] (0.2, -2.4) -- node[right] {\tt git commit} (0.2, -0.5);
		
	\draw[very thick, -stealth] (5.8, -0.5) -- node[left] {\tt git pull} (5.8, -2.4);
	\draw[very thick, -stealth] (6.2, -2.4) -- node[right] {\tt git commit} (6.2, -0.5);
\end{tikzpicture}
\end{document}

grid_RBG+3d+foreach+learn.tex

% https://tex.stackexchange.com/a/271584/173708
\documentclass[border={10}]{standalone}
\usepackage{tikz}  
\usepackage{tikz-3dplot} 

\tdplotsetmaincoords{60}{125} % view angles
\tdplotsetrotatedcoords{0}{0}{0} 
\begin{document}

\begin{tikzpicture}
    [%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        scale=5,tdplot_rotated_coords,
        grid/.style={very thin,gray}
    ]%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

    %draw a grid in the x-y plane
    \foreach \x in {0,1,...,10}
        \foreach \y in {0,1,...,10}
        {
            \draw[grid] (\x,0) -- (\x,10);
            \draw[grid] (0,\y) -- (10,\y);
        };
    \draw[fill=blue]  (0,0,0) -- (0,1,0) -- (1,1,0) -- (1,0,0) -- cycle;
    \draw[fill=red ]  (1,1,0) -- (2,1,0) -- (2,2,0) -- (1,2,0) -- cycle;
\end{tikzpicture}    
\end{document}

impact-2048.tex

% 
\documentclass[tikz]{standalone}
\renewcommand\familydefault{\sfdefault}
\usepackage{tikz}
\usetikzlibrary{fit,backgrounds}
%
\definecolor{grid color}{HTML}{BBADA0}
\definecolor{pixel 0}{HTML}{CCC0B3}
\definecolor{pixel 2}{HTML}{EEE4DA}
\definecolor{pixel 4}{HTML}{EDE0C8}
\definecolor{pixel 8}{HTML}{F2B179}
\definecolor{pixel 16}{HTML}{F59563}
\definecolor{pixel 32}{HTML}{F67C5F}
\definecolor{pixel 64}{HTML}{F65E3B}
\definecolor{pixel 128}{HTML}{EDCF72}
\definecolor{pixel 256}{HTML}{EDCC61}
\definecolor{pixel 512}{HTML}{EDC850}
\definecolor{pixel 1024}{HTML}{EDC53F}
\definecolor{pixel 2048}{HTML}{EDC22E}
\definecolor{pixel 4096}{HTML}{3E3933}
%
\definecolor{small color}{HTML}{776E65}
\definecolor{big color}{HTML}{F9F6F2}
%
\tikzset{
  case 2048 base/.style={minimum size=9mm,rounded corners=.3mm,text=#1,inner sep=0},
  %
  case 2048 LARGE/.style={font=\LARGE\bfseries\sffamily,case 2048 base=#1},
  case 2048 Large/.style={font=\Large\bfseries\sffamily,case 2048 base=#1},
  case 2048 large/.style={font=\large\bfseries\sffamily,case 2048 base=#1},
  case 2048 normal/.style={font=\normalsize\bfseries\sffamily,case 2048 base=#1},
  %
  case 2048 0/.style={case 2048 Large=black,fill=pixel 0,node contents={}},
  case 2048 2/.style={case 2048 Large=small color,fill=pixel 2,node contents={2}},
  case 2048 4/.style={case 2048 Large=small color,fill=pixel 4,node contents={4}},
  case 2048 8/.style={case 2048 Large=big color,fill=pixel 8,node contents={8}},
  case 2048 16/.style={case 2048 Large=big color,fill=pixel 16,node contents={16}},
  case 2048 32/.style={case 2048 Large=big color,fill=pixel 32,node contents={32}},
  case 2048 64/.style={case 2048 Large=big color,fill=pixel 64,node contents={64}},
  case 2048 128/.style={case 2048 large=big color,fill=pixel 128,node contents={128}},
  case 2048 256/.style={case 2048 large=big color,fill=pixel 256,node contents={256}},
  case 2048 512/.style={case 2048 large=big color,fill=pixel 512,node contents={512}},
  case 2048 1024/.style={case 2048 normal=big color,fill=pixel 1024,node contents={1024}},
  case 2048 2048/.style={case 2048 normal=big color,fill=pixel 2048,node contents={2048}},
  case 2048 4096/.style={case 2048 normal=big color,fill=pixel 4096,node contents={4096}},
}
\begin{document}
\begin{tikzpicture}
  \def\pixels{
    {0,2,32,64},
    {256,8,512,4},
    {1024,2048,4,16},
    {4096,16,128,2},
  }

  \foreach \line [count=\y] in \pixels {
    \foreach \pix [count=\x] in \line {
      \path (\x,-\y) node[name=c2048-\x-\y,case 2048 \pix];
    }
  }

  \begin{scope}[on background layer]
    \node[fill=grid color,fit=(c2048-1-1)(c2048-4-4),
    inner sep=1mm,rounded corners=.3mm]{};
  \end{scope}
\end{tikzpicture}
\end{document}

impact-circular_arrows+diagram+foreach.tex

% http://www.texample.net/media/tikz/examples/TEX/circular-arrows-text.tex
% Circular arrows with text
% Author: Tom Bombadil
\documentclass[tikz,border=10pt]{standalone}
%%%<
\usepackage{verbatim}
%%%>
\begin{comment}
:Title: Circular arrows with text
:Tags: Arrows;Decorations;Arcs;Foreach;Diagrams
:Author: Tom Bombadil
:Slug: circular-arrows-text

This example was written by Tom Bombadil answering a question on TeX.SE,
with a modification by Stefan Kottwitz adding a text font style
showing an implicit way.
\end{comment}

\usetikzlibrary{decorations.text}

\newcommand*{\mytextstyle}{\sffamily\Large\bfseries\color{black!85}}
\newcommand{\arcarrow}[8]{%
% inner radius, middle radius, outer radius, start angle,
% end angle, tip protusion angle, options, text
  \pgfmathsetmacro{\rin}{#1}
  \pgfmathsetmacro{\rmid}{#2}
  \pgfmathsetmacro{\rout}{#3}
  \pgfmathsetmacro{\astart}{#4}
  \pgfmathsetmacro{\aend}{#5}
  \pgfmathsetmacro{\atip}{#6}
  \fill[#7] (\astart:\rin) arc (\astart:\aend:\rin)
       -- (\aend+\atip:\rmid) -- (\aend:\rout) arc (\aend:\astart:\rout)
       -- (\astart+\atip:\rmid) -- cycle;
  \path[font = \sffamily, decoration = {text along path, text = {|\mytextstyle|#8},
    text align = {align = center}, raise = -0.5ex}, decorate]
    (\astart+\atip:\rmid) arc (\astart+\atip:\aend+\atip:\rmid);
}

\begin{document}
\begin{tikzpicture}
  \fill[even odd rule,red!30] circle (3.8) circle (3.2);
  \foreach \x in {0,60,...,300} {
    \arcarrow{3}{3.5}{4}{\x+20}{\x+70}{5}{red,
      draw = red!50!black, very thick}{text \x}
  }
\end{tikzpicture}
\end{document}

impact-concentric-blocks+diagram.tex

% https://github.com/FriendlyUser/LatexDiagrams
\documentclass[border=5pt]{standalone}
\usepackage{xcolor}

	\definecolor{ocre}{HTML}{800000}
	\definecolor{sky}{HTML}{C6D9F1}
	\definecolor{skybox}{HTML}{5F86B3}

\usepackage{tikz}
\usepackage{pgfmath}
\usetikzlibrary{decorations.text, arrows.meta,calc,shadows.blur,shadings}

\renewcommand*\familydefault{\sfdefault} % Set font to serif family

% arctext from Andrew code with modifications:
%Variables: 1: ID, 2:Style 3:box height 4: Radious 5:start-angl 6:end-angl 7:text {format along path} 
\def\arctext[#1][#2][#3](#4)(#5)(#6)#7{

\draw[#2] (#5:#4cm+#3) coordinate (above #1) arc (#5:#6:#4cm+#3)
             -- (#6:#4) coordinate (right #1) -- (#6:#4cm-#3) coordinate (below right #1) arc (#6:#5:#4cm-#3) coordinate (below #1)
             -- (#5:#4) coordinate (left #1) -- cycle;
            \def\a#1{#4cm+#3}
            \def\b#1{#4cm-#3}
\path[
    decoration={
        raise = -0.5ex, % Controls relavite text height position.
        text  along path,
        text = {#7},
        text align = center,        
    },
    decorate
    ]
    (#5:#4) arc (#5:#6:#4);
}

%arcarrow, this is mine, for beerware purpose...
%Function: Draw an arrow from arctex coordinate specific nodes to another 
%Arrow start at the start of arctext box and could be shifted to change the position
%to avoid go over another box.
%Var: 1:Start coordinate 2:End coordinate 3:angle to shift from acrtext box  
\def\arcarrow(#1)(#2)[#3]{
    \draw[thick,->,>=latex] 
        let \p1 = (#1), \p2 = (#2), % To access cartesian coordinates x, and y.
            \n1 = {veclen(\x1,\y1)}, % Distance from the origin
            \n2 = {veclen(\x2,\y2)}, % Distance from the origin
            \n3 = {atan2(\y1,\x1)} % Angle where acrtext starts.
        in (\n3-#3: \n1) -- (\n3-#3: \n2); % Draw the arrow.
}

\begin{document}
\begin{tikzpicture}[
    % Environment Cfg
    font=\sf    \scriptsize,
    % Styles
    myarrow/.style={
        thick,
        -latex,
    },
    Center/.style ={
        circle,
        fill=ocre,
        text=white,
        align=center,
        font =\footnotesize\bf,
        inner sep=1pt,          
    },
    RedArc/.style ={
        color=black,
        thick,
        fill=ocre,
        blur shadow, %Tikzedt not suport online view
    },
    SkyArc/.style ={
        color=skybox,
        thick,
        fill=sky,
        blur shadow, %Tikzedt not suport online view
    },
    ]

    % Drawing the center
    \node[Center](SOSA) at (0,0) { Sensor \\ Observation, \\ Sample, and \\ Actuator \\(SOSA)};
    \coordinate (SOSA-R) at (0:1.2); % To make compatible with \arcarrow macro.

    % Drawing the Tex Arcs

    % \Arctext[ID][box-style][box-height](radious)(start-angl)(end-angl){|text-styles| Text}

    \arctext[SSN][RedArc][8pt](2.25)(180)(60){|\footnotesize\bf\color{white}| Semantic Sensor Network (SSN)};
    \arctext[SCap][RedArc][8pt](2.25)(50)(-20){|\footnotesize\bf\color{white}| System Capabilities};
    \arctext[SRel][SkyArc][8pt](2.25)(190)(255){|\footnotesize\color{black}| System Relation};
    \arctext[OMAM][RedArc][5pt](3.5)(205)(265){|\scriptsize\bf\color{white}| O{\&}M Alignment Module};
    \arctext[PROV][SkyArc][5pt](3.5)(270)(320){|\scriptsize| PROV Alignment Module};
    \arctext[OBOE][SkyArc][5pt](3.5)(-35)(20){|\scriptsize| OBOE Alignment Module};
    \arctext[DUAM][SkyArc][5pt](4.5)(215)(150){|\scriptsize| Dolce-UltraLite Alingment Module};
    \arctext[SSNX][SkyArc][5pt](4.5)(145)(80){|\scriptsize| SSNX Alingment Module};

    %ADITIONAL
    \arctext[NEW][
        color=white,
        shade,      
        upper left=red,
        upper right=black!50,
        lower left=blue,
        lower right=blue!50,
        rounded corners = 8pt
        ][8pt](5.2)(100)(-20){|\footnotesize\bf\color{white}| You can create and use all the style options for shapes and text};

    %Drawing the Arrows
    %\arcarrow(above/below ID)(abobe/below ID)[shift]
    \arcarrow(below DUAM)(above SRel)[15];
    \arcarrow(below SSNX)(above SSN)[35];
    \arcarrow(below SSN)(SOSA-R)[60];
    \arcarrow(below right OMAM)(SOSA-R)[4];
    \arcarrow(below right PROV)(SOSA-R)[25];
    \arcarrow(below OBOE)(SOSA-R)[-5];

    %Same level Arrows
    \draw[myarrow] (left SSNX) -- (right DUAM);
    \draw[myarrow] (left SSN) -- (left SRel);
    \draw[myarrow] (left SCap) -- (right SSN);

        \draw[myarrow] (-5,-3.5) coordinate (legend) -- ++(.8,0) node[anchor=west] {owl: imports (extends)};
        \draw[RedArc] (legend)++(0,-0.4) rectangle ++(.8,-.3)++(0,.2) node[anchor=west] {normative};
        \draw[SkyArc] (legend)++(0,-1) rectangle ++(.8,-.3)++(0,.2) node[anchor=west, color=black] {non-normative};

\end{tikzpicture}

\end{document}

impact-market_sector+diagram.tex

% % https://github.com/FriendlyUser/LatexDiagrams
% Inspired by Learn Algorithmic Trading by Sebastien Donadio Packt on page 10
\documentclass{standalone}
\usepackage{tikz}
\usepackage{xcolor}
\usetikzlibrary{shapes, arrows.meta, positioning}

\begin{document}
\pagestyle{empty}

\begin{tikzpicture}[
    node distance=2em and 2em,
    block/.style={rectangle, draw, 
    text width=6.5em, text centered, rounded corners, minimum height=4em},
    line/.style={draw, -latex},
    ]

    \node [block, fill=gray!15!red!15] (hc) {HealthCare};
    \node [block, fill=gray!45, below right= of hc] (serv) {Services};
    \node [block, fill=blue!45, below = of serv] (tech) {Technology};
    \node [block,fill=blue!15, below left= of tech] (util) {Utilities};
    \node [block,fill=brown!45, above left= of util] (trans) {Transportation};
    \node [block, fill=red!45, above = of trans] (fin) {Financial};
    % Connections
    \path [line] (hc.east) to[out=0, in=90] (serv.north);
    \path [line] (serv.south) -- (tech);
    \path [line] (tech.south) to[out=-90, in=0] (util.east);
    \path [line] (util.west) to[out=180, in=-90] (trans.south);
        \path [line] (trans.north) -- (fin);
    \path [line] (fin.north) to[out=90, in=180] (hc.west);
    
    % Market Sectors label
    \node [draw=none, below = 5em of hc, text width = 2cm, align = center] (label) {\LARGE Market \\[1mm] Sector};
    
    \node [above left = -3em and 3em of util] () {Energy};
    \node [above right = -3em and 3em of util] () {Cyclical Goods};
    \node [above right = -1em and 0.25em of tech, text width = 3.5em] () {Non-Cyclical Goods};
    \node [above right = -1.25em and 0.25em of hc, text width = 7em] () {Basic Materials};
    \node [above left = -1.25em and 0.25em of hc, text width = 7em] () {Capital Goods};
    \node [above left = 0.25em and -3em of trans] () {Conglomerates};
\end{tikzpicture}
\end{document}

impact-os_model_layers.tex

% https://github.com/FriendlyUser/LatexDiagrams
\documentclass[border=2mm]{standalone}

\usepackage[most]{tcolorbox}
\usepackage{lmodern}
\usepackage{lipsum}
%\usepackage{geometry}

\standaloneenv{tcbposter}

%\pagestyle{empty}
\begin{document}

\begin{tcbposter}[%
    poster = {columns=8, rows=9, width=17cm, height=8cm, spacing=1mm},% showframe},
    boxes = {colback=cyan!80!black, 
        boxrule=0pt, arc=2mm,
        colframe=cyan!80!black, 
        halign=center, valign=center,   
        colupper=white,
        fontupper=\sffamily\bfseries, size=small}
]
%1st row
\posterbox{column=1, row=1}{HTTP}
\posterbox{column=2, row=1}{HTTP/2}
\posterbox{column=3, row=1}{MQTT}
\posterbox{column=4, row=1}{CoAP}
\posterbox{column=5, row=1}{FTP}
\posterbox{column=6, row=1}{TFTP}

%2nd row
\posterbox{column=1, row=2}{SMTP}
\posterbox{column=2, row=2}{SNTP}
\posterbox{column=3, row=2}{DNS}
\posterbox{column=4, row=2}{NetBIOS}
\posterbox{column=5, row=2, span=2}{SNMPv1/v2c/v3}

%3rd row
\posterbox{column=1, row=3, span=2}{WebSocket}
\posterbox{column=3, row=3}{mDNS}
\posterbox{column=4, row=3}{DNS-SD}
\posterbox{column=5, row=3}{DHCP}
\posterbox{column=6, row=3}{DHCPv6}

%4th row
\posterbox{column=1, row=4,span=6}{Socket}

%5th row
\posterbox{column=1, row=5, span=2.5}{TCP}
\posterbox{column*=5, row=5, span=2.5}{UDP}
\posterbox{column=6, row=5}{RAW}

%6th row
\posterbox{column=1, row=6, span=3}{IPv4}
\posterbox{column=4, row=6, span=3}{IPv6}

%7th row
\posterbox{column=1, row=7, span=1.5}{ARP}
\posterbox{column*=3, row=7, span=1.5}{Auto-IP}
\posterbox{column=4, row=7, span=1.5}{NDP}
\posterbox{column*=6, row=7, span=1.5}{SLAAC}

%8th row
\posterbox{column=1, row=8, span=1.5}{ICMP}
\posterbox{column*=3, row=8, span=1.5}{IGMPv2}
\posterbox{column=4, row=8, span=1.5}{ICMPv6}
\posterbox{column*=6, row=8, span=1.5}{MLDv1}

%9th row
%5 boxes and 4 separations should use 
%equivalent to 6 original boxes plus 5 
%separations 
\newlength{\mylength}
\pgfmathsetlength{\mylength}{(6*\tcbpostercolwidth+\tcbpostercolspacing)/5}%

%Use `width` instead of `span` to fix box size
\posterbox[width=\mylength]{name=91, column=1, row=9}{Ethernet}
\posterbox[width=\mylength]{name=92, column=1, row=9, xshift=\mylength+\tcbpostercolspacing}{Wi-Fi}
\posterbox[width=\mylength]{name=92, column=1, row=9, xshift=2*\mylength+2*\tcbpostercolspacing}{PPP}
\posterbox[width=\mylength]{name=92, column=1, row=9, xshift=3*\mylength+3*\tcbpostercolspacing}{USB/RNDIS}
\posterbox[width=\mylength]{column*=6, row=9}{G3-PLC}

%Right column
\posterbox[colback=gray, colframe=gray, colupper=black]{column=7, row=1, span=2, rowspan=3}{7 - Application}
\posterbox[colback=gray!80, colframe=gray!80, colupper=black]{column=7, row=4, span=2}{5 - Session}
\posterbox[colback=gray!60, colframe=gray!60, colupper=black]{column=7, row=5, span=2}{4 - Transport}
\posterbox[colback=gray!40, colframe=gray!40, colupper=black]{column=7, row=6, span=2, rowspan=3}{3 - Network}
\posterbox[colback=gray!20, colframe=gray!20, colupper=black]{column=7, row=9, span=2}{2 - Data Link}

\end{tcbposter}

\end{document}

impact-simulation_abstraction+physics.tex

% Simulation approaches versus abstraction levels
% Author: Valeria Borodin
\documentclass[border=10pt,svgnames]{standalone} 
%%%<
\usepackage{verbatim}
%%%>
\begin{comment}
:Title: Simulation approaches versus abstraction levels
:Tags: Diagrams;Shadows;Styles
:Author: Valeria Borodin
:Slug: simulation-abstraction

This is the LaTeX version of the figure from the following link:
https://en.wikipedia.org/wiki/AnyLogic#/media/File:Simulation_approaches_vs_abstraction_levels.jpg
Note that the color range is slightly modified.

This example illustrates how modelling approaches correspond
to the abstraction levels.
\end{comment}
\usepackage{tikz}
\usetikzlibrary{positioning,shadows.blur}
\usepackage{pifont}
\renewcommand{\labelitemi}{\ding{112}}
\begin{document}

\begin{tikzpicture} 
   \tikzset{
     box/.style    = { rounded corners = 5pt,
                       align           = left,
                       font            = \sffamily\footnotesize,
                       text width      = 3.45cm, 
                       blur shadow     = {shadow blur steps = 15} },    
     legend/.style = { font       = \sffamily\bfseries, 
                       align      = right,
                       text width = 3.4cm},
  }
  \node [shade,
    blur shadow  = {shadow blur steps = 15},
    text width   = 1.01\textwidth,
    top color    = black, 
    bottom color = Maroon,
    text         = white, 
    font         = \sffamily\bfseries\large] (A)
    {Aggregates, global feedback dynamics, ...  \\ \vspace{.6\textwidth} 
    Individual objects, exact sizes, distances, velocities, timings, ...};
  
  \node [box, below left  = -4.5cm and -3.85cm of A, fill = YellowGreen]
    (DE)
    {\underline{\bfseries Discrete Event (DE)}
      \begin{itemize} 
        \setlength{\itemindent} {-.5cm}
        \item entities (passive objects)
        \item flowcharts 
        \item network ressources
      \end{itemize}
    };

  \node [box, above right  = -3.5cm and .5cm of DE,
    minimum height=0.55\textwidth, fill = Gold, text depth = 0.35\textwidth]
    (AB)
    { \underline{\bfseries Agent Based (AB)} 
        \begin{itemize} \setlength{\itemindent}{-.5cm}
          \item Active objects
          \item Individual behavior rules
          \item (In)direct interaction
          \item Environnement models
          \end{itemize}  
    };

  \node [box, above right  = -2.cm and .5cm of AB, fill = LightSteelBlue]
    (SD)
    { \underline{\bfseries System Dynamics (SD)}
      \begin{itemize} \setlength{\itemindent}{-.5cm}
        \item Levels (aggregates)
        \item Stocks \& flow diagrams
        \item Feedback loops
      \end{itemize}
    };

  \node [legend, above left = -1.25cm and 4.75cm of AB] (HA)
    {High Abstraction \\ Less Details \\ Macro Level \\ Strategic Level};

  \node [legend, below = 1.5cm of HA] (MA)
    {Middle Abstraction \\ Average Details \\ Meso Level \\ Tactical Level};
  
  \node [legend, below = 1.5cm of MA] (LA)
    {Low Abstraction \\ More Details \\ Micro Level \\ Operational Level};

  \node [below = 1.25cm of AB, font = \sffamily\bfseries\large ] (d1) 
    {Mostly Discrete $\triangleleft$};

  \node [right = .5cm of d1, font = \sffamily\bfseries\large ] (d2) 
    {$\triangleright$ Mostly Continuous };
  
   \path [ draw, color = DimGray, dashed, line width = 2pt ]
     (d1.south east) + (0.3cm,0)   coordinate(x1) -- (x1|-A.north);  
   
   \path [draw, <->, >=latex, line width = 2pt ]
     (A.south west)  + (-0.25cm,0) coordinate(x2) -- (x2|-A.north);
\end{tikzpicture}
\end{document}

impact-supreme_court-2+diagram.tex

% https://tex.stackexchange.com/questions/415763/tikz-nodes-are-offset-to-the-right?rq=1
\documentclass[tikz, margin=3mm]{standalone}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usepackage[margin=1in]{geometry}
\usetikzlibrary{arrows.meta, calc, positioning}

\begin{document}

\begin{tikzpicture}[node distance = 6mm,
    box/.style = {rectangle, rounded corners, thick,
                    draw=#1!70!gray, fill=#1!30,
                    text width=4cm, minimum height=1cm, align=flush center,
                    font=\sffamily\linespread{.8}\selectfont}]
    % first row, on the bottom
    \node (94-district)     [box=blue]
    {\textbf{94 District Courts}\\
        \scriptsize
        Hears cases and deals verdicts. \textit{Judge Judy} except federal.};
    \node (legis-courts)    [box=blue, right=of 94-district]
    {\textbf{Legislative Courts}\\
        \scriptsize
        Weaker Courts created by Congress. (E.g. \textit{Court of Military Appeals})};
    \node (trial-court)     [box=blue, below right=0mm and 4mm of legis-courts.north east]
    {\textbf{Trial Court}\\
        \scriptsize
        Your typical \textit{Judge Judy} case. Hears either criminal or civil cases, and deals verdicts.};
    % second row
    \node (12-appeals)      [box=red, above=of 94-district]
    {\textbf{12 Federal Courts of Appeals}\\
        \scriptsize
        Hears Appeals from lower courts. Geographically distributed.};
    \node (court-appeals)   [box=red, above=of legis-courts]
    {\textbf{Court of Appeals for the Federal Circuit}\\
        \scriptsize
        Hears special federal appeals. (e.g. patents)};
    \node (state-appeals)   [box=red, above=of trial-court]
    {\textbf{State Court of\\ Appeals}\\
        \scriptsize
        Hears Appeals from Trials on a Case-By-Case basis.};
    % third row
    % firs calculate spreme court node width
    \path   let \p1 = ($(12-appeals.west)-(court-appeals.east)$),
                \n1 = {veclen(\x1,\y1)} in
            node (scotus)
                [box=green, font=\sffamily\Huge\bfseries,
                text width=\n1-2*\pgfkeysvalueof{/pgf/inner xsep},
                above=of $(12-appeals.north)!0.5!(court-appeals.north)$]
                {The Supreme Court};
    \node (state)       [box=green, right = of scotus]
    {\large\textbf{State Supreme Court}\\
        \scriptsize
        Highest Law of the State};
    \draw [-Stealth, thick]
        (trial-court)   edge (state-appeals)
        (state-appeals) edge (state)
        (state)         edge (scotus)
        (legis-courts)  edge (court-appeals)
        (court-appeals) edge (scotus.south -| court-appeals)
        (94-district)   edge (12-appeals)
        (12-appeals)     to  (12-appeals |- scotus.south) ;

\end{tikzpicture}
\end{document}

impact-supreme_court+diagram.tex

\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric, arrows.meta, positioning}
\tikzset{
  red-rounded-rectangle/.style={rectangle, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=red!30, align=center},
  green-rounded-rectangle/.style={rectangle, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=green!30, align=center},
  blue-rounded-rectangle/.style={rectangle, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=blue!30, align=center},
}
\begin{document}
\begin{tikzpicture}[node distance=0.5cm, >/.tip=Latex, thick]
  \node (scotus) [green-rounded-rectangle, text width = 10cm]{
    {\Huge \textbf{The Supreme Court}}
  };
  \node (state) [green-rounded-rectangle, right = of scotus, text width=4cm]{
    {\large \textbf{State Supreme Court}}\\
    Highest Law of the State
  };
  \node (state-appeals) [red-rounded-rectangle, below  = of  state, text width = 4cm]{
    {\large \textbf{State Court of Appeals}}\\
    Hears Appeals from Trials on a Case-By-Case basis.
  };
  \node (12-appeals) [red-rounded-rectangle, left=of state-appeals -| scotus, text width = 4cm] {
    {\large \textbf{12 Federal Courts of Appeals}}\\
    Hears Appeals from lower courts. Geographically distributed.
  };
  \node (94-district) [blue-rounded-rectangle, below = of 12-appeals,, text width=4cm]{
    {\large \textbf{94 District Courts}}\\
    Hears cases and deals verdicts. \textit{Judge Judy} except federal.
  };
  \node (court-appeals) [red-rounded-rectangle, right = of scotus |- state-appeals, text width=4cm]{
    {\large \textbf{Court of Appeals for the Federal Circuit}}\\
    Hears special federal appeals. (e.g. patents)
  };
  \node (legis-courts) [blue-rounded-rectangle, below= of court-appeals, text width = 4cm]{
    {\large \textbf{Legislative Courts}}\\
    Weaker Courts created by Congress. (E.g. \textit{Court of Military Appeals})
  };
  \node (trial-court) [blue-rounded-rectangle, below = of state-appeals,  text width=4cm]{
    {\large \textbf{Trial Court}}\\
    Your typical \textit{Judge Judy} case. Hears either criminal or civil cases, and deals verdicts.
  };
  \draw [->] 
    (trial-court) 	edge (state-appeals) 
    (state-appeals) edge (state) 
    (state) edge (scotus) 
    (legis-courts) edge (court-appeals) 
    (court-appeals) edge (scotus.south -| court-appeals) 
    (94-district) 	edge (12-appeals) 
    (12-appeals) -- 
    (12-appeals |- scotus.south) ;
\end{tikzpicture}
\end{document}

impact-technologies_arrow+matrix+set+command+matrix.tex

% http://www.texample.net/media/tikz/examples/TEX/arrow-table.tex
% Table in the shape of an arrow
% Author: Gonzalo Medina
\documentclass{article}
\usepackage{tikz}
%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{10pt}%
%%%>
\begin{comment}
:Title: Table in the shape of an arrow
:Tags: Matrices;Arrows;Decorations
:Author: Gonzalo Medina
:Slug: arrow-table

This table is drawn using the TikZ matrix library,
in order to get the shape of an arrow.

It was written by Gonzalo Medina on TeX.SE.
Sligh modifications to the original code: sans serif font,
small caps instead of all caps style, indentation and spacing.
\end{comment}
\usetikzlibrary{calc,matrix,decorations.markings,decorations.pathreplacing}

\definecolor{colone}{RGB}{209,220,204}
\definecolor{coltwo}{RGB}{204,222,210}
\definecolor{colthree}{RGB}{207,233,232}
\definecolor{colfour}{RGB}{248,243,214}
\definecolor{colfive}{RGB}{245,238,197}
\definecolor{colsix}{RGB}{243,235,179}
\definecolor{colseven}{RGB}{241,231,163}

\tikzset{ 
  table/.style={
    matrix of nodes,
    row sep=-\pgflinewidth,
    column sep=-\pgflinewidth,
    nodes={rectangle,text width=2cm,align=center},
    text depth=1.25ex,
    text height=2.5ex,
    nodes in empty cells
  }
}

\renewcommand*{\familydefault}{\sfdefault}
\newcommand{\cbox}[1]{\parbox[t]{2cm}{\centering #1}}

\begin{document}

\begin{tikzpicture}
  \matrix (mat) [table] {
    |[fill=colfour]|      & |[fill=colfour]|  & |[fill=colfour]|
      & |[fill=colfour]|  & |[fill=colfour]|  &                   \\
    |[fill=colfive]|      & |[fill=colfive]|  & |[fill=colfive]|
      & |[fill=colfive]|  & |[fill=colfive]|  &                   \\
    |[fill=colsix]|       & |[fill=colsix]|   & |[fill=colsix]|
      & |[fill=colsix]|   & |[fill=colsix]|   & |[fill=colsix]|   \\
    |[fill=colseven]|     & |[fill=colseven]| & |[fill=colseven]|
      & |[fill=colseven]| & |[fill=colseven]| & |[fill=colseven]| \\
    |[fill=colone]|       & |[fill=coltwo]|   & |[fill=colthree]|
      & |[fill=coltwo]|   & |[fill=colone]|   & |[fill=colone]|   \\
    |[fill=colone]|       & |[fill=coltwo]|   & |[fill=colthree]|
      & |[fill=coltwo]|   & |[fill=colone]|   & |[fill=colone]|   \\
    |[fill=colone]|       & |[fill=coltwo]|   & |[fill=colthree]|
      & |[fill=coltwo]|   & |[fill=colone]|   &                   \\
    |[fill=colone]|       & |[fill=coltwo]|   & |[fill=colthree]|
      & |[fill=coltwo]|   & |[fill=colone]|   &                   \\
  };

  % horizontal rules
  \foreach \row in {2,3,4}
    \draw[white] (mat-\row-1.north west) -- (mat-\row-6.north east);
  \draw[white,ultra thick] (mat-1-1.north west) -- (mat-1-6.north east);
  \draw[white,ultra thick] (mat-5-1.north west) -- (mat-5-6.north east);

  % vertical rules
  \foreach \col in {2,3,4,5}
    \draw[white] (mat-5-\col.north west) -- (mat-8-\col.south west);

  % The labels
  \node[fill=colfour] at (mat-1-3) {Firm Infrastructure};
  \node[fill=colfive] at (mat-2-3) {Human Resources Management};
  \node[fill=colsix] at (mat-3-3) {Technology Development};
  \node[fill=colseven] at (mat-4-3) {Procurement};
  \node at ([yshift=-10pt]mat-6-1) {\cbox{Inbound Logistics}};
  \node at ([yshift=-10pt]mat-6-2) {\cbox{Operations \\\mbox{}}};
  \node at ([yshift=-10pt]mat-6-3) {\cbox{Outbound Logistics}};
  \node at ([yshift=-10pt]mat-6-4) {\cbox{Marketing \& Sales}};
  \node at ([yshift=-10pt]mat-6-5) {\cbox{Service \\\mbox{}}};
  \node[rotate = 90] at ([xshift=-52pt]mat-3-1.north)
    {\textsc{Support Activities}};
  \node at ([yshift=-19pt, xshift=-0.5cm]mat-8-3.south)
    {\textsc{Primary Activities}};

  % Erase some visible lines outside the arrow
  \fill[white] (mat-1-5.north east) -- (mat-5-6.north east)
    -- (mat-1-6.north east) -- cycle;
  \fill[white] (mat-8-5.north east) -- (mat-5-6.north east)
    -- (mat-8-6.north east) -- cycle;

  % Draw the arrow tip
  \shade[top color=colfour!70, bottom color=colfour!70,
    middle color=colseven, draw=white, ultra thick] 
    (mat-1-5.north) -- (mat-5-6.north) -- (mat-8-5.south) -- 
    (mat-8-5.south east) -- (mat-5-6.north east) -- (mat-8-5.south east) -- 
    (mat-5-6.north east) -- (mat-1-5.north east) -- cycle;

  % The slanted "Margin" labels
  \begin{scope}[decoration={markings,
    mark=at position .5 with \node[transform shape] {Margin};}]
  \path[postaction={decorate}] 
    ( $ (mat-1-5.north)!0.5!(mat-1-5.north east) $ )
    -- ( $ (mat-5-6.north)!0.5!(mat-5-6.north east) $ );
  \path[postaction={decorate}] 
    ( $ (mat-5-6.north)!0.5!(mat-5-6.north east) $ )
    -- ( $ (mat-8-5.south)!0.5!(mat-8-5.south east) $ );
  \end{scope}

  % The braces
  \draw[decorate, decoration={brace, mirror, raise=6pt}]
    (mat-1-1.north west) -- (mat-5-1.north west);
  \draw[decorate, decoration={brace, mirror, raise=6pt}]
    (mat-8-1.south west) -- (mat-8-5.south);
\end{tikzpicture}
\end{document}

impact-venn+diagram.tex

% http://www.texample.net/media/tikz/examples/TEX/venn.tex
% A Venn diagram with PDF blending
% Author: Stefan Kottwitz
% https://www.packtpub.com/hardware-and-creative/latex-cookbook
\documentclass[border=10pt]{standalone} 
%%%<
\usepackage{verbatim}
%%%>
\begin{comment}
:Title: A Venn diagram with PDF blending
:Tags: Diagrams;Cookbook
:Author: Stefan Kottwitz
:Slug: venn

PDF blend mode requires TikZ version 3.0 or above.
\end{comment}

\usepackage{tikz}
\begin{document}
\begin{tikzpicture}
  \begin{scope}[blend group = soft light]
    \fill[red!30!white]   ( 90:1.2) circle (2);
    \fill[green!30!white] (210:1.2) circle (2);
    \fill[blue!30!white]  (330:1.2) circle (2);
  \end{scope}
  \node at ( 90:2)    {Computer Science};
  \node at ( 210:2)   {Statistics};
  \node at ( 330:2)   {Coding};
  \node [font=\Large] {Data Science};
\end{tikzpicture}
\end{document}

inertial_system_color+diagram+pgf+command+def+layer.tex

% http://www.texample.net/media/tikz/examples/TEX/inertial-navigation-system.tex
\documentclass[crop, tikz]{standalone}

\usepackage{tikz}
\usetikzlibrary{shapes,arrows}
\usepackage{amsmath,bm,times}
\usepackage{verbatim}

\begin{comment}
:Title: Inertial navigation system
:Tags: Block diagrams, Layers

A block diagram of an inertial measurement unit (IMU) combined with navigation
equations to form an inertial navigation system (INS). A handful of useful tricks have been 
used to align blocks and arrows nicely. Hard coding coordinates has been avoided as
much as possible.

\end{comment}

\newcommand{\mx}[1]{\mathbf{\bm{#1}}} % Matrix command
\newcommand{\vc}[1]{\mathbf{\bm{#1}}} % Vector command

\begin{document}
\pagestyle{empty}

% We need layers to draw the block diagram
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}

% Define a few styles and constants
\tikzstyle{sensor}=[draw, fill=blue!20, text width=5em, 
    text centered, minimum height=2.5em]
\tikzstyle{ann} = [above, text width=5em]
\tikzstyle{naveqs} = [sensor, text width=6em, fill=red!20, 
    minimum height=12em, rounded corners]
\def\blockdist{2.3}
\def\edgedist{2.5}

\begin{tikzpicture}
    \node (naveq) [naveqs] {Navigation equations};
    % Note the use of \path instead of \node at ... below. 
    \path (naveq.140)+(-\blockdist,0) node (gyros) [sensor] {Gyros};
    \path (naveq.-150)+(-\blockdist,0) node (accel) [sensor] {Accelero-meters};
    
    % Unfortunately we cant use the convenient \path (fromnode) -- (tonode) 
    % syntax here. This is because TikZ draws the path from the node centers
    % and clip the path at the node boundaries. We want horizontal lines, but
    % the sensor and naveq blocks aren't aligned horizontally. Instead we use
    % the line intersection syntax |- to calculate the correct coordinate
    \path [draw, ->] (gyros) -- node [above] {$\vc{\omega}_{ib}^b$} 
        (naveq.west |- gyros) ;
    % We could simply have written (gyros) .. (naveq.140). However, it's
    % best to avoid hard coding coordinates
    \path [draw, ->] (accel) -- node [above] {$\vc{f}^b$} 
        (naveq.west |- accel);
    \node (IMU) [below of=accel] {IMU};
    \path (naveq.south west)+(-0.6,-0.4) node (INS) {INS};
    \draw [->] (naveq.50) -- node [ann] {Velocity } + (\edgedist,0) 
        node[right] {$\vc{v}^l$};
    \draw [->] (naveq.20) -- node [ann] {Attitude} + (\edgedist,0) 
        node[right] { $\mx{R}_l^b$};
    \draw [->] (naveq.-25) -- node [ann] {Horisontal position} + (\edgedist,0)
        node [right] {$\mx{R}_e^l$};
    \draw [->] (naveq.-50) -- node [ann] {Depth} + (\edgedist,0) 
        node[right] {$z$};
    
    % Now it's time to draw the colored IMU and INS rectangles.
    % To draw them behind the blocks we use pgf layers. This way we  
    % can use the above block coordinates to place the backgrounds   
    \begin{pgfonlayer}{background}
        % Compute a few helper coordinates
        \path (gyros.west |- naveq.north)+(-0.5,0.3) node (a) {};
        \path (INS.south -| naveq.east)+(+0.3,-0.2) node (b) {};
        \path[fill=yellow!20,rounded corners, draw=black!50, dashed]
            (a) rectangle (b);
        \path (gyros.north west)+(-0.2,0.2) node (a) {};
        \path (IMU.south -| gyros.east)+(+0.2,-0.2) node (b) {};
        \path[fill=blue!10,rounded corners, draw=black!50, dashed]
            (a) rectangle (b);
    \end{pgfonlayer}
\end{tikzpicture}

\end{document}

io-fit+diagram.tex

% https://tex.stackexchange.com/questions/152952/drawing-this-diagram-in-tikz?rq=1
\documentclass[tikz,border=10pt]{standalone}
\usetikzlibrary{fit,positioning,calc}
\tikzset{decision/.style = {diamond, draw, fill=blue!20, text width=4.5em, text badly centered, node
                            distance=3cm, inner sep=0pt},
         block/.style    = {rectangle, draw, fill=black!25, text width=5em, text centered, rounded
                            corners, minimum height=4em},
         line/.style     = {draw, -latex'},
         cloud/.style    = {draw, ellipse,fill=red!20, node distance=3cm, minimum height=2em}
}
\begin{document}
\begin{tikzpicture}[scale=2,font=\small]
    \node [draw=black,minimum width=3cm,minimum height=0.85cm] (io2) {SSD System};
    \node [draw=black,minimum width=3cm,minimum height=0.85cm, below =0.32cm of io2] (io3) {Fuzzy Logic ACC};
    \draw [latex-] ($(io2.south east)!0.33!(io2.south west)$) -- ($(io3.north east)!0.33!(io3.north west)$);
    \draw [-latex] ($(io2.south east)!0.66!(io2.south west)$) -- ($(io3.north east)!0.66!(io3.north west)$);
    \node[fit=(io2) (io3), draw=red, dotted,minimum height=3cm] (fit) {};
    \node[anchor=south] at (fit.north) {ADAS};
    \node [draw=black,rotate=90,anchor=north,minimum width=3cm,minimum height=0.75cm,left=1cm of fit,anchor=south] (io) {I/O interface};
    \draw[-latex] ($(io.south east)!0.3!(io.south west)$) -- ($(fit.north west)!0.3!(fit.south west)$);
    \draw[latex-] ($(io.south east)!0.7!(io.south west)$) -- ($(fit.north west)!0.7!(fit.south west)$);
    \foreach \x/\a in {0.2/2,0.4/4,0.6/6,0.8/8}{
    \coordinate (z\a) at ($(io.north east)!\x!(io.north west)$);
    }
    \draw[latex-](z2)--+(-.5,0) node[anchor=east]{Distance Sensor};
    \draw[latex-](z4)--+(-.5,0) node[anchor=east]{Video Input};
    \draw[latex-](z6)--+(-.5,0) node[anchor=east]{Set Speed Limit};
    \draw[-latex](z8)--+(-.5,0) node[anchor=east,minimum width=3.1cm,align=left]{Factored \\ Acceleration}; 
\end{tikzpicture}
\end{document}

iso-louvre-planes.tex

% louvre-plaes.tex
% https://tex.stackexchange.com/q/186058/173708
\documentclass{article}
\usepackage{tikz}
\usepackage{verbatim}
\usetikzlibrary{shapes,shadows,positioning,arrows,calc,matrix,decorations.markings,decorations.pathreplacing}

% like standalone
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%

\begin{document}

\definecolor{colone}{RGB}{209,220,204}
\definecolor{coltwo}{RGB}{204,222,210}
\definecolor{colthree}{RGB}{207,233,232}
\definecolor{colfour}{RGB}{248,243,214}
\definecolor{colfive}{RGB}{245,238,197}
\definecolor{colsix}{RGB}{243,235,179}
\definecolor{colseven}{RGB}{241,231,163}
\definecolor{colortop}{RGB}{184,223,155}
\definecolor{colorside}{RGB}{0,209,54}

\begin{figure}
\begin{tikzpicture}[every node/.style={minimum size=1cm,font=\scriptsize},on grid]
  \begin{scope}[every node/.append style={yslant=-0.5},yslant=-0.5]
    \shade[right color=colorside!30, left color=colorside!50] (-1,0) rectangle +(4,3);
    \node  at (-0.5,2.25) {};
    \node at (0.5,2.75) {$Sex$};
    \node at (1.5,2.75) {$Age$};
    \node at (2.5,2.75) {$Area$};
    \node at (-0.5,1.25) {$User_3$};
    \node at (-0.5,0.75) {$...$};
    \node at (0.5,0.75) {$...$};
    \node at (2.5,0.75) {$...$};
    \node at (0.5,1.25) {$*$};
    \node at (1.5,1.25) {$4$};
    \node at (2.5,1.25) {$0$};
    \node at (-0.5,0.25) {$User_n$};
    \node at (1.5,0.75) {$...$};
    \node at (-0.5,2.25) {$user_1$};
    \node at (0.5,2.25) {$0$};
    \node at (1.5,2.25) {$*$};
    \node at (2.5,2.25) {$1$};
      \node at (-0.5,1.75) {$User_2$};
      \node at (0.5,1.75) {$1$};
      \node at (1.5,1.75) {$3$};
      \node at (2.5,1.75) {$0$};
      \node at (0.5,0.25) {$2$};
      \node at (1.5,0.25) {$*$};
      \node at (2.5,0.25) {$9$};
    \draw (-1,0) grid[ystep=0.5] (3,3);
  \end{scope}
  
  \begin{scope}[every node/.append style={yslant=0.5},yslant=0.5]
    \shade[right color=colorside!70,left color=colorside!10] (3,-3) rectangle +(5,3);
    \node at (3.5,-0.25) {};
    \node at (3.5,-0.75) {$user_1$};
    \node at (3.5,-1.25) {$user_2$};
    \node at (3.5,-1.75){$user_3$};
    \node at (3.5,-2.25) {$...$};
    \node at (3.5,-2.75) {$user_n$};
    \node at (4.5,-0.25) {$item_1$};
    \node at (4.5,-1.25) {$3$};
    \node at (4.5,-0.75) {$*$};
    \node at (4.5,-1.75) {$*$};
    \node at (4.5,-2.25) {$...$};
    \node at (4.5,-2.75) {$*$};
    \node at (5.5,-0.25) {$item_2$};
    \node at (5.5,-0.75) {$2$};
    \node at (5.5,-1.75) {$3$};
    \node at (5.5,-1.25) {$4$};
    \node at (5.5,-2.75) {$5$};
    \node at (5.5,-2.25) {$...$};
    \node at (6.5,-0.25) {$...$};
    \node at (6.5,-1.25) {$...$};
    \node at (6.5,-2.25) {$...$};
    \node at (6.5,-0.75) {$...$};
    \node at (6.5,-1.75) {$...$};
    \node at (6.5,-2.75) {$...$};
    \node at (7.5,-0.25) {$item_n$};
    \node at (7.5,-0.75) {$3$};
    \node at (7.5,-1.25) {$5$};
    \node at (7.5,-1.75) {$4$};
    \node at (7.5,-2.25) {$...$};
    \node at (7.5,-2.75) {$*$};

    \draw (3,-3) grid[ystep=0.5] (8,0);
  \end{scope}

  \begin{scope}[every node/.append style={
    yslant=0.5,xslant=-1},yslant=0.5,xslant=-0.75
    ]
    \shade[bottom color=colortop!10, top color=colortop!80] (8,4) rectangle +(-5,-4);
    \draw (3.0,0.0) grid[ystep=0.5] (8,4);
    \node at (3.5,3.75) {};
    \node at (3.5,3.25) {$Legal$};
    \node at (3.5,2.75) {$Fin.$};
    \node at (3.5,2.25) {$Med.$};
    \node at (3.5,1.75) {$Home$};
    \node at (3.5,1.25) {$Road$};
    \node at (3.5,0.75) {$Travel$};
    \node at (3.5,0.25) {$Din.$};
    \node at (4.5,3.75) {$item_1$};
    \node at (4.5,3.25) {$1$};
    \node at (4.5,2.75) {$0$};
    \node at (4.5,2.25) {$0$};
    \node at (4.5,1.75) {$1$};
    \node at (4.5,1.25) {$1$};
    \node at (4.5,0.75) {$0$};
    \node at (4.5,0.25) {$1$};
    \node at (5.5,3.75) {$item_2$};
    \node at (5.5,3.25) {$1$};
    \node at (5.5,2.75) {$0$};
    \node at (5.5,2.25) {$0$};
    \node at (5.5,1.75) {$1$};
    \node at (5.5,1.25) {$0$};
    \node at (5.5,0.75) {$1$};
    \node at (5.5,0.25) {$1$};
    \node at (6.5,3.75) {$...$};
    \node at (6.5,3.25) {$...$};
    \node at (6.5,2.75) {$...$};
    \node at (6.5,2.25) {$...$};
    \node at (6.5,1.75) {$...$};
    \node at (6.5,1.25) {$...$};
    \node at (6.5,0.75) {$...$};
    \node at (6.5,0.25) {$...$};
    \node at (7.5,3.75) {$item_n$};
    \node at (7.5,3.25) {$0$};
    \node at (7.5,2.75) {$1$};
    \node at (7.5,2.25) {$1$};
    \node at (7.5,1.75) {$0$};
    \node at (7.5,1.25) {$0$};
    \node at (7.5,0.75) {$1$};
    \node at (7.5,0.25) {$0$};
  \end{scope}
\end{tikzpicture}
  \caption{User-Item Combined Matrix}
  \label{fig:com}
\end{figure}
\end{document}

iso-network-ex_doc_4-13+elem+network.tex

% =============================================================================
% File      : ex_doc_4-13.tex -- example 4.13
% Author    : Jürgen Hackl <hackl.j@gmx.at>
% Creation  : 2019-08-14
% Time-stamp: <Thu 2019-08-15 09:44 juergen>
%
% Copyright (c) 2019 Jürgen Hackl <hackl.j@gmx.at>
% =============================================================================
\documentclass{standalone}
\usepackage{tikz-network}

\begin{document}

\begin{tikzpicture}[multilayer=3d]
	\Plane[x=-.5,y=-.5,width=3,height=2.5,grid=5mm]
\end{tikzpicture}

\end{document}
% =============================================================================
% eof

%%% Local Variables:
%%% mode: latex
%%% TeX-master: t
%%% End:

iso-planes_multiple_ocean+projection+style+scope+slant.tex

\documentclass[border=5pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning, patterns, decorations.pathreplacing}
\usetikzlibrary{calc}
\usetikzlibrary{arrows,shapes,backgrounds}

\begin{document}


\begin{tikzpicture}[scale=.9,every node/.style={minimum size=1cm},on grid]

    \tikzstyle{select arrow}=[->, thick,cyan!70!black]
    \tikzstyle{action arrow}=[->, thick,cyan!90!black]
    \tikzstyle{action good}=[thick,cyan!50!black]
    \tikzstyle{action bad}=[thick,cyan!30]
    \tikzstyle{active neuron}=[cyan!90]
    \tikzstyle{selected neuron}=[cyan!30]
    \tikzstyle{bad action}=[pattern=north west lines, pattern color=cyan!30]

    %FINAL STATE. plane at the bottom
    \begin{scope}[
                yshift=-160,every node/.append style={
                yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
                ]

            \fill[white,fill opacity=0.9] (0,0) rectangle (2.5,2.5);
            \draw[step=5mm, black] (0,0) grid (2.5,2.5);
            \draw[black,very thick] (0,0) rectangle (2.5,2.5);
            \fill[active neuron] (0.55,0.55) rectangle (0.95,0.95);

        \draw[->,thick, blue!50!cyan] (0.3,0.25) -- (0.7,0.25);
    \end{scope}

    \draw[action arrow, red, thin] (-0.5,-3.25) -- (0,-4.9);

    %SECOND ACTION
    \begin{scope}[
        yshift=-120,every node/.append style={
        yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
                    ]
        \fill[white,fill opacity=.95] (0,0) rectangle (1.5,1.5);
        \draw[step=5mm, black] (0,0) grid (1.5,1.5);
        \draw[black,very thick] (0,0) rectangle (1.5,1.5);

        \fill[bad action] (0.05,0.05) rectangle (0.45,0.45);
        \fill[bad action] (1.05,0.05) rectangle (1.45,0.45);
        \fill[bad action] (1.05,1.05) rectangle (1.45,1.45);
        \fill[bad action] (0.05,1.05) rectangle (0.45,1.45);

        \node[action good] at (0.25,0.75) {W};
        \node[action good] at (1.25,0.75) {E};
        \node[action good] at (0.75,1.25) {N};
        \node[action bad] at (0.75,0.25) {S};
        \end{scope}

    \draw[action arrow] (0.5,-2.45) -- (0.5,-3.25);
    \draw[action arrow, red] (0.5,-2.45) -- (-0.5,-3.25);
    \draw[action arrow] (0.5,-2.45) -- (-0.5,-3.75);

    %SECOND STATE
    \begin{scope}[
        yshift=-80,every node/.append style={
        yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
        ]

        \fill[white,fill opacity=0.9] (0,0) rectangle (2.5,2.5);
        \draw[step=5mm, black] (0,0) grid (2.5,2.5);
        \draw[black,very thick] (0,0) rectangle (2.5,2.5);
        \fill[active neuron] (0.55,0.05) rectangle (0.95,0.45);  
        \fill[selected neuron] (0.05,0.05) rectangle (0.45,0.45);
        \fill[selected neuron] (1.05,0.05) rectangle (1.45,0.45);
        \fill[selected neuron] (0.55,0.55) rectangle (0.95,0.95);

        \draw[select arrow] (0.85,0.25) -- (1.25,0.25);
        \draw[select arrow] (0.75,0.35) -- (0.75,.75);
        \draw[select arrow] (0.65,0.25) -- (0.25,0.25);
    \end{scope}

    \draw[action arrow, red] (0.5,-0.45) -- (0.5,-2.3);

    %FIRST ACTION
    \begin{scope}[
        yshift=-40,every node/.append style={
        yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
                    ]
        \fill[white,fill opacity=.95] (0,0) rectangle (1.5,1.5);
        \draw[step=5mm, black] (0,0) grid (1.5,1.5);
        \draw[black,very thick] (0,0) rectangle (1.5,1.5);

        \fill[bad action] (0.05,0.05) rectangle (0.45,0.45);
        \fill[bad action] (1.05,0.05) rectangle (1.45,0.45);
        \fill[bad action] (1.05,1.05) rectangle (1.45,1.45);
        \fill[bad action] (0.05,1.05) rectangle (0.45,1.45);

        \node[action bad] at (0.25,0.75) {W};
        \node[action good] at (1.25,0.75) {E};
        \node[action good] at (0.75,1.25) {N};
        \node[action bad] at (0.75,0.25) {S};
    \end{scope}

    \draw[action arrow, red] (0.125,0.125) -- (0.5,-0.45);
    \draw[action arrow] (-0.125,0.125) -- (-0.5,-0.45);

    %INITIAL STATE. plane at the top
    \begin{scope}[
        every node/.append style={
        yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
        ]

        \fill[white,fill opacity=0.9] (0,0) rectangle (2.5,2.5);
        \draw[step=5mm, black] (0,0) grid (2.5,2.5);
        \draw[black,very thick] (0,0) rectangle (2.5,2.5);
        \fill[active neuron] (0.05,0.05) rectangle (0.45,0.45);
        \fill[selected neuron] (0.55,0.05) rectangle (0.95,0.45);
        \fill[selected neuron] (0.05,0.55) rectangle (0.45,0.95);

        \draw [decorate,decoration={brace,amplitude=10pt}] (0,2.6) -- (2.6,2.6);
        \node at (1.6,3.3) {d};

        \draw[select arrow] (0.25,0.35) -- (0.25,0.75);
        \draw[select arrow] (0.35,0.25) -- (0.75,0.25);

        \node at (1.125,-0.3) {\textbf{x}};
        \node at (-0.3,1.125) {\textbf{y}};

    \end{scope}

    \node at (4,1.25) {$S$};
    \node at (4,-0.5) {$a$};
    \node at (4,-1.5) {$S'$};
    \node at (4,-3.25) {$a'$};

\end{tikzpicture}
\end{document}

iso-planes-multidimensional-array-inclined.tex

% https://tex.stackexchange.com/a/295021/173708
\documentclass[tikz,border=5]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc}

\begin{document}
\begin{tikzpicture}[x=0.5cm,y=0.5cm]
    \begin{scope}[rotate=130,]
        \draw[gray] (-4  ,-1.5) -- (6  ,3.5);
    \end{scope}
    \foreach \shift in {-5,0,5}
    {
        \foreach \x in {1,...,4}
        {
            \foreach \y in {1,...,4}
            {
                \begin{scope}[rotate=130,shift={(\shift,0.5*\shift)},]
                    \draw[fill=white] (\x,\y) rectangle (\x+1,\y+1);
                    \node at (\x+0.5,\y+0.5) {\pgfmathrnd\pgfmathparse{round(\pgfmathresult)}
                        \pgfmathprintnumber[precision=1]{\pgfmathresult}};
                \end{scope}
            }
        }
    }
    \begin{scope}[rotate=130,]
        \draw         (-4, 2.5) -- (6  ,7.5);
        \draw[dashed] (0 , 2.5) -- (10,7.5);
        \draw[dashed] (0 ,-1.5) -- (10,3.5) node[midway,anchor=south west] {Channel};
    \end{scope}
\end{tikzpicture}
\end{document}

iso-planes-multidimensional-array.tex

% https://tex.stackexchange.com/a/295109/173708

\documentclass[tikz,border=5]{standalone}
\begin{document} 
	
\begin{tikzpicture}[x=(15:.5cm), y=(90:.5cm), z=(330:.5cm), >=stealth]
	\draw (0, 0, 0) -- (0, 0, 10) (4, 0, 0) -- (4, 0, 10);
	\foreach \z in {0, 5, 10} \foreach \x in {0,...,3}
	  \foreach \y [evaluate={\b=random(0, 1);}] in {0,...,3}
	    \filldraw [fill=white] (\x, \y, \z) -- (\x+1, \y, \z) -- (\x+1, \y+1, \z) --
	      (\x, \y+1, \z) -- cycle (\x+.5, \y+.5, \z) node [yslant=tan(15)] {\b};
	\draw [dashed] (0, 4, 0) -- (0, 4, 10) (4, 4, 0) -- (4, 4, 10);
	\draw [->] (0, 4.5, 0)  -- (4, 4.5, 0)   node [near end, above left] {Column};
	\draw [->] (-.5, 4, 0)  -- (-.5, 0, 0)   node [midway, left] {Row};
	\draw [->] (4, 4.5, 10) -- (4, 4.5, 2.5) node [near end, above right] {Channel};
\end{tikzpicture}%
\end{document}

iso-planes-polarization+3d+foreach.tex

% Polarizing microscope
% Author: Cyril Langlois
% This TikZ code sketches the light behavior during its travel in a polarizing
% petrographic microscope when a birefringent crystal thin section is inserted
% between the polarizing devices.
% 
% The goal was to correctly show the vectorial relationships between light
% electric fields during its travel through the first polaroid, the mineral
% section and the second polaroid.
\documentclass[11pt]{article}
\usepackage{tikz}
\usetikzlibrary{arrows}
%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>

\begin{comment}
:Title: Polarizing microscope
:Tags: 3D; Earth Sciences; Petrography; Physics
:Author: Cyril Langlois

This TikZ code sketches the light behavior during its travel in a polarizing
petrographic microscope when a birefringent crystal thin section is inserted
between the polarizing devices.

The goal was to correctly show the vectorial relationships between light
electric fields during its travel through the first polaroid, the mineral
section and the second polaroid.
\end{comment}

\begin{document}
\begin{tikzpicture}[x={(0.866cm,-0.5cm)}, y={(0.866cm,0.5cm)}, z={(0cm,1cm)}, scale=1.0,
    %Option for nice arrows
    >=stealth, %
    inner sep=0pt, outer sep=2pt,%
    axis/.style={thick,->},
    wave/.style={thick,color=#1,smooth},
    polaroid/.style={fill=black!60!white, opacity=0.3},
]
    % Colors
    \colorlet{darkgreen}{green!50!black}
    \colorlet{lightgreen}{green!80!black}
    \colorlet{darkred}{red!50!black}
    \colorlet{lightred}{red!80!black}

    % Frame
    \coordinate (O) at (0, 0, 0);
    \draw[axis] (O) -- +(14, 0,   0) node [right] {x};
    \draw[axis] (O) -- +(0,  2.5, 0) node [right] {y};
    \draw[axis] (O) -- +(0,  0,   2) node [above] {z};

    \draw[thick,dashed] (-2,0,0) -- (O);

    % monochromatic incident light with electric field
    \draw[wave=blue, opacity=0.7, variable=\x, samples at={-2,-1.75,...,0}]
        plot (\x, { cos(1.0*\x r)*sin(2.0*\x r)}, { sin(1.0*\x r)*sin(2.0*\x r)})
        plot (\x, {-cos(1.0*\x r)*sin(2.0*\x r)}, {-sin(1.0*\x r)*sin(2.0*\x r)});

    \foreach \x in{-2,-1.75,...,0}{
        \draw[color=blue, opacity=0.7,->]
            (\x,0,0) -- (\x, { cos(1.0*\x r)*sin(2.0*\x r)}, { sin(1.0*\x r)*sin(2.0*\x r)})
            (\x,0,0) -- (\x, {-cos(1.0*\x r)*sin(2.0*\x r)}, {-sin(1.0*\x r)*sin(2.0*\x r)});
    }

    \filldraw[polaroid] (0,-2,-1.5) -- (0,-2,1.5) -- (0,2,1.5) -- (0,2,-1.5) -- (0,-2,-1.5)
        node[below, sloped, near end]{Polaroid};%

    %Direction of polarization
    \draw[thick,<->] (0,-1.75,-1) -- (0,-0.75,-1);

    % Electric field vectors
    \draw[wave=blue, variable=\x,samples at={0,0.25,...,6}]
        plot (\x,{sin(2*\x r)},0)node[anchor=north]{$\vec{E}$};

    %Polarized light between polaroid and thin section
    \foreach \x in{0, 0.25,...,6}
        \draw[color=blue,->] (\x,0,0) -- (\x,{sin(2*\x r)},0);

    \draw (3,1,1) node [text width=2.5cm, text centered]{Polarized light};

    %Crystal thin section
    \begin{scope}[thick]
        \draw (6,-2,-1.5) -- (6,-2,1.5) node [above, sloped, midway]{Crystal section}
                -- (6, 2, 1.5) -- (6, 2, -1.5) -- cycle % First face
            (6,  -2, -1.5) -- (6.2, -2,-1.5)
            (6,   2, -1.5) -- (6.2,  2,-1.5)
            (6,  -2,  1.5) -- (6.2, -2, 1.5)
            (6,   2,  1.5) -- (6.2,  2, 1.5)
            (6.2,-2, -1.5) -- (6.2, -2, 1.5) -- (6.2, 2, 1.5) 
                -- (6.2, 2, -1.5) -- cycle; % Second face

        %Optical indices
        \draw[darkred, ->]       (6.1, 0, 0) -- (6.1, 0.26,  0.966) node [right] {$n_{g}'$}; % index 1
        \draw[darkred, dashed]   (6.1, 0, 0) -- (6.1,-0.26, -0.966); % index 1
        \draw[darkgreen, ->]     (6.1, 0, 0) -- (6.1, 0.644,-0.173) node [right] {$n_{p}'$}; % index 2
        \draw[darkgreen, dashed] (6.1, 0, 0) -- (6.1,-0.644, 0.173); % index 2
    \end{scope}

    %Rays leaving thin section
    \draw[wave=darkred,   variable=\x, samples at={6.2,6.45,...,12}] 
        plot (\x, {0.26*0.26*sin(2*(\x-0.5) r)},  {0.966*0.26*sin(2*(\x-0.5) r)});  %n'g-oriented ray
    \draw[wave=darkgreen, variable=\x, samples at={6.2,6.45,...,12}]
        plot (\x, {0.966*0.966*sin(2*(\x-0.1) r)},{-0.26*0.966*sin(2*(\x-0.1) r)}); %n'p-oriented ray
    \draw (10,1,1) node [text width=2.5cm, text centered] {Polarized and dephased light};

    \foreach \x in{6.2,6.45,...,12} {
        \draw[color=darkgreen, ->] (\x, 0, 0) --
            (\x, {0.966*0.966*sin(2*(\x-0.1) r)}, {-0.26*0.966*sin(2*(\x-0.1) r)});
        \draw[color=darkred,   ->] (\x, 0, 0) --
            (\x, {0.26*0.26*sin(2*(\x-0.5) r)}, {0.966*0.26*sin(2*(\x-0.5) r)});
    }

    %Second polarization
    \draw[polaroid]   (12, -2,  -1.5) -- (12, -2,   1.5)  %Polarizing filter
        node [above, sloped,midway] {Polaroid} -- (12, 2, 1.5) -- (12, 2, -1.5) -- cycle;
    \draw[thick, <->] (12, -1.5,-0.5) -- (12, -1.5, 0.5); %Polarization direction

    %Light leaving the second polaroid
    \draw[wave=lightgreen,variable=\x, samples at={12, 12.25,..., 14}]
        plot (\x,{0}, {0.966*0.966*0.26*sin(2*(\x-0.5) r)}); %n'g polarized ray
    \draw[wave=lightred,  variable=\x, samples at={12, 12.25,..., 14}]
        plot (\x,{0}, {-0.26*0.966*sin(2*(\x-0.1) r)});      %n'p polarized ray

    \node[align=justify, text width=14cm, anchor=north west, yshift=-2mm] at (current bounding box.south west)
        {Light behavior in a petrographic microscope with light polarizing
        device. Only one incident wavelength is shown (monochromatic light).
        The magnetic field, perpendicular to the electric one, is not drawn.};
\end{tikzpicture}
\end{document}

iso-swan_wave_model-iso-off.tex

% layers off

% https://texample.net/tikz/examples/swan-wave-model/
% Author: Marco Miani
% SWAN (developed by SWAN group, TU Delft, The Netherlands) is a wave spectral numerical model.
%For Simlating WAves Nearshore, it is necessary to define spatial grids of
%physical dominant factors (wind friction, dissipation) as well as define a COMPUTATIONAL
%grid on which the model performs its (spectral) calculations: budgeting energy spectra over
%each cell of the (computational) grid. Grids might have different spatial resolution and extension.

\documentclass[12pt]{article}
\usepackage{tikz}
\usetikzlibrary{positioning}


\begin{document}
\pagestyle{empty}

% Define the layers to draw the diagram
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}


\begin{tikzpicture}[scale=.9,every node/.style={minimum size=1cm},on grid]

    \begin{pgfonlayer}{background}
%       \draw [help lines, step=1,color=blue!15, very thin] (-6, 11) grid (10,-7);
    \end{pgfonlayer}          
        
    \begin{pgfonlayer}{foreground}
%        % help guide lines
%        \draw [help lines,dashed] (0,-7) -- (0,11);    
%        \draw [help lines,dashed] (-6,0) -- (10,0);            
%        \node at (9,10) (zero) {(9,10)};        
%        \node at (6,6) (zero) {(6,6)};        
%        \node at (4,4) (zero) {(4,4)};        
%        \node at (-5,4) (zero) {(-5,4)};        
%        \node at (-5,1) (zero) {(-5,1)};        
%        \node at (-5,-2) (zero) {(-5,-2)};        
%        \node at (-5,-5) (zero) {(-5,-5)};             
%        \node at (7,-5) (zero) {(7,-5)};                  
%        \node at (8,-7) (zero) {(8,-7)};                       
%        \node at (0,-7) (zero) {(0,-7)};                                       
    \end{pgfonlayer}          

    % Comp G
    %slanting: production of a set of n 'laminae' to be piled up. N=number of grids.
    \begin{scope}[
        yshift=-83,every node/.append style={
            yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
        ]
        % opacity to prevent graphical interference
        \fill[white,fill opacity=0.9] (0,0) rectangle (5,5);
        \draw[step=5mm, black] (0,0) grid (5,5);        % defining grids
        \draw[step=1mm, red!50,thin] (3,1) grid (4,2);  % Nested Grid
        \draw[black,very thick] (0,0) rectangle (5,5);  % marking borders
        \fill[red] (0.05,0.05) rectangle (0.5,0.5);   % Idem as above, for the n-th grid:
        % add some labels
        \begin{scope}[color=blue,font=\footnotesize]
            \node at (0,0) (a) {(0,0)};
            \node at (5,5) (a) {(5,5)};
            \node at (5,0) (a) {(5,0)};
            \node at (0,5) (a) {(0,5)};   
        \end{scope}     
    \end{scope}
    
    % Bathymetry up
    \begin{scope}[
        yshift=0,every node/.append style={
            yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
        ]
        \fill[white,fill opacity=.9] (0,0) rectangle (5,5);
        \draw[black,very thick] (0,0) rectangle (5,5);
        \draw[step=5mm, black] (0,0) grid (5,5);
    \end{scope}  
    
    % Wind G
    % grid with internal 3x3 of step=10mm
    \begin{scope}[
        yshift=90,every node/.append style={
            yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
        ]
        \fill[white,fill opacity=.9] (0,0) rectangle (5,5);
        \draw[step=10mm, black] (1,1) grid (4,4);
        \draw[black,very thick] (1,1) rectangle (4,4);
        \draw[black,dashed] (0,0) rectangle (5,5);
        
        \node at (1,1) (a) {(1,1)};
    \end{scope}      

    % Friction G
    % grid with green subgrid of 2mm step
    \begin{scope}[
        yshift=170,every node/.append style={
         yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
         ]
        \fill[white,fill opacity=0.6] (0,0) rectangle (5,5);
        \draw[step=10mm, black] (2,2) grid (5,5);
        \draw[step=2mm, green] (2,2) grid (3,3);
        \draw[black,very thick] (2,2) rectangle (5,5);
        \draw[black,dashed] (0,0) rectangle (5,5);
        
        \node at (2,2) (a) {(2,2)};
    \end{scope}    
    
    % bottom grid
    \begin{scope}[
        yshift=-170,every node/.append style={
            yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
        ]
        %marking border
        \draw[black,very thick] (0,0) rectangle (5,5);
        
        %drawing corners (P1,P2, P3): only 3 points needed to define a plane.
        \draw [fill=lime](0,0) circle (.1) ;
        \draw [fill=lime](0,5) circle (.1);
        \draw [fill=lime](5,0) circle (.1);
        \draw [fill=lime](5,5) circle (.1);
        
        %drawing bathymetric hypotetic countours on the bottom grid:    	
        \draw [ultra thick](0,1)   parabola bend (2,2) (5,1)  ;
        \draw [dashed]     (0,1.5) parabola bend (2.5,2.5) (5,1.5) ;
        \draw [dashed]     (0,2)   parabola bend (2.7,2.7) (5,2)  ;
        \draw [dashed]     (0,2.5) parabola bend (3.5,3.5) (5,2.5)  ;
        \draw [dashed]     (0,3.5) parabola bend (2.75,4.5) (5,3.5);
        \draw [dashed]     (0,4)   parabola bend (2.75,4.8) (5,4);
        \draw [dashed]     (0,3)   parabola bend (2.75,3.8) (5,3);
        \draw[-latex,thick](2.8,1) node[right]{$\mathsf{Shoreline}$}
            to[out=180,in=270] (2,1.99);
    \end{scope} %end of drawing grids   
    
    
    % arrows
    %putting arrows and labels:
    \draw[-latex,thick] (6.2,2) node[right]{$\mathsf{Bathymetry (up)}$}
        to[out=180,in=90] (4,2);
    
    \draw[-latex,thick](5.8,-.3)node[right]{$\mathsf{Comp.\ G.}$}
        to[out=180,in=90] (3.9,-1);
    
    \draw[-latex,thick](5.9,5)node[right]{$\mathsf{Wind\ G.}$}
        to[out=180,in=90] (3.6,5);
    
    \draw[-latex,thick](5.9,8.4)node[right]{$\mathsf{Friction\ G.}$}
        to[out=180,in=90] (3.2,8);
    
    \draw[-latex,thick,red](5.3,-4.2)node[right]{$\mathsf{G. Cell}$}
        to[out=180,in=90] (0,-2.5);
    
    \draw[-latex,thick,red](4.3,-1.9)node[right]{$\mathsf{Nested\ G.}$}
        to[out=180,in=90] (2,-.5);
    
    \draw[-latex,thick](4,-6)node[right]{$\mathsf{Batymetry (dn)}$}
        to[out=180,in=90] (2,-5);	    
     

\end{tikzpicture}

\end{document}

iso-swan_wave_model-iso-on.tex

% layers on

% https://texample.net/tikz/examples/swan-wave-model/
% Author: Marco Miani
% SWAN (developed by SWAN group, TU Delft, The Netherlands) is a wave spectral numerical model.
%For Simlating WAves Nearshore, it is necessary to define spatial grids of
%physical dominant factors (wind friction, dissipation) as well as define a COMPUTATIONAL
%grid on which the model performs its (spectral) calculations: budgeting energy spectra over
%each cell of the (computational) grid. Grids might have different spatial resolution and extension.

\documentclass[12pt]{article}
\usepackage{tikz}
\usetikzlibrary{positioning}


\begin{document}
\pagestyle{empty}

% Define the layers to draw the diagram
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}


\begin{tikzpicture}[scale=.9,every node/.style={minimum size=1cm},on grid]

    \begin{pgfonlayer}{background}
       \draw [help lines, step=1,color=blue!15, very thin] (-6, 11) grid (10,-7);
    \end{pgfonlayer}          
        
    \begin{pgfonlayer}{foreground}
        % help guide lines
        \draw [help lines,dashed] (0,-7) -- (0,11);    
        \draw [help lines,dashed] (-6,0) -- (10,0);            
        \node at (9,10) (zero) {(9,10)};        
        \node at (6,6) (zero) {(6,6)};        
        \node at (4,4) (zero) {(4,4)};        
        \node at (-5,4) (zero) {(-5,4)};        
        \node at (-5,1) (zero) {(-5,1)};        
        \node at (-5,-2) (zero) {(-5,-2)};        
        \node at (-5,-5) (zero) {(-5,-5)};             
        \node at (7,-5) (zero) {(7,-5)};                  
        \node at (8,-7) (zero) {(8,-7)};                       
        \node at (0,-7) (zero) {(0,-7)};                                       
    \end{pgfonlayer}          

    % Comp G
    %slanting: production of a set of n 'laminae' to be piled up. N=number of grids.
    \begin{scope}[
        yshift=-83,every node/.append style={
            yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
        ]
        % opacity to prevent graphical interference
        \fill[white,fill opacity=0.9] (0,0) rectangle (5,5);
        \draw[step=5mm, black] (0,0) grid (5,5);        % defining grids
        \draw[step=1mm, red!50,thin] (3,1) grid (4,2);  % Nested Grid
        \draw[black,very thick] (0,0) rectangle (5,5);  % marking borders
        \fill[red] (0.05,0.05) rectangle (0.5,0.5);   % Idem as above, for the n-th grid:
        % add some labels
        \begin{scope}[color=blue,font=\footnotesize]
            \node at (0,0) (a) {(0,0)};
            \node at (5,5) (a) {(5,5)};
            \node at (5,0) (a) {(5,0)};
            \node at (0,5) (a) {(0,5)};   
        \end{scope}     
    \end{scope}
    
    % Bathymetry up
    \begin{scope}[
        yshift=0,every node/.append style={
            yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
        ]
        \fill[white,fill opacity=.9] (0,0) rectangle (5,5);
        \draw[black,very thick] (0,0) rectangle (5,5);
        \draw[step=5mm, black] (0,0) grid (5,5);
    \end{scope}  
    
    % Wind G
    % grid with internal 3x3 of step=10mm
    \begin{scope}[
        yshift=90,every node/.append style={
            yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
        ]
        \fill[white,fill opacity=.9] (0,0) rectangle (5,5);
        \draw[step=10mm, black] (1,1) grid (4,4);
        \draw[black,very thick] (1,1) rectangle (4,4);
        \draw[black,dashed] (0,0) rectangle (5,5);
        
        \node at (1,1) (a) {(1,1)};
    \end{scope}      

    % Friction G
    % grid with green subgrid of 2mm step
    \begin{scope}[
        yshift=170,every node/.append style={
         yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
         ]
        \fill[white,fill opacity=0.6] (0,0) rectangle (5,5);
        \draw[step=10mm, black] (2,2) grid (5,5);
        \draw[step=2mm, green] (2,2) grid (3,3);
        \draw[black,very thick] (2,2) rectangle (5,5);
        \draw[black,dashed] (0,0) rectangle (5,5);
        
        \node at (2,2) (a) {(2,2)};
    \end{scope}    
    
    % bottom grid
    \begin{scope}[
        yshift=-170,every node/.append style={
            yslant=0.5,xslant=-1},yslant=0.5,xslant=-1
        ]
        %marking border
        \draw[black,very thick] (0,0) rectangle (5,5);
        
        %drawing corners (P1,P2, P3): only 3 points needed to define a plane.
        \draw [fill=lime](0,0) circle (.1) ;
        \draw [fill=lime](0,5) circle (.1);
        \draw [fill=lime](5,0) circle (.1);
        \draw [fill=lime](5,5) circle (.1);
        
        %drawing bathymetric hypotetic countours on the bottom grid:    	
        \draw [ultra thick](0,1)   parabola bend (2,2) (5,1)  ;
        \draw [dashed]     (0,1.5) parabola bend (2.5,2.5) (5,1.5) ;
        \draw [dashed]     (0,2)   parabola bend (2.7,2.7) (5,2)  ;
        \draw [dashed]     (0,2.5) parabola bend (3.5,3.5) (5,2.5)  ;
        \draw [dashed]     (0,3.5) parabola bend (2.75,4.5) (5,3.5);
        \draw [dashed]     (0,4)   parabola bend (2.75,4.8) (5,4);
        \draw [dashed]     (0,3)   parabola bend (2.75,3.8) (5,3);
        \draw[-latex,thick](2.8,1) node[right]{$\mathsf{Shoreline}$}
            to[out=180,in=270] (2,1.99);
    \end{scope} %end of drawing grids   
    
    
    % arrows
    %putting arrows and labels:
    \draw[-latex,thick] (6.2,2) node[right]{$\mathsf{Bathymetry (up)}$}
        to[out=180,in=90] (4,2);
    
    \draw[-latex,thick](5.8,-.3)node[right]{$\mathsf{Comp.\ G.}$}
        to[out=180,in=90] (3.9,-1);
    
    \draw[-latex,thick](5.9,5)node[right]{$\mathsf{Wind\ G.}$}
        to[out=180,in=90] (3.6,5);
    
    \draw[-latex,thick](5.9,8.4)node[right]{$\mathsf{Friction\ G.}$}
        to[out=180,in=90] (3.2,8);
    
    \draw[-latex,thick,red](5.3,-4.2)node[right]{$\mathsf{G. Cell}$}
        to[out=180,in=90] (0,-2.5);
    
    \draw[-latex,thick,red](4.3,-1.9)node[right]{$\mathsf{Nested\ G.}$}
        to[out=180,in=90] (2,-.5);
    
    \draw[-latex,thick](4,-6)node[right]{$\mathsf{Batymetry (dn)}$}
        to[out=180,in=90] (2,-5);	    
     

\end{tikzpicture}

\end{document}

kalman+diagram+set.tex

% http://www.texample.net/media/tikz/examples/TEX/kalman-filter.tex
% Kalman filter system model
% by Burkart Lingner
% An example using TikZ/PGF 2.00
%
% Features: Decorations, Fit, Layers, Matrices, Styles
% Tags: Block diagrams, Diagrams
% Technical area: Electrical engineering

\documentclass[a4paper,10pt]{article}

\usepackage[english]{babel}
\usepackage[T1]{fontenc}
\usepackage[ansinew]{inputenc}

\usepackage{lmodern}	% font definition
\usepackage{amsmath}	% math fonts
\usepackage{amsthm}
\usepackage{amsfonts}

\usepackage{tikz}

%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>

\begin{comment}
:Title: Kalman Filter System Model
:Slug: kalman-filter
:Author: Burkart Lingner

This is the system model of the (linear) Kalman filter. 

\end{comment}


\usetikzlibrary{decorations.pathmorphing} % noisy shapes
\usetikzlibrary{fit}					% fitting shapes to coordinates
\usetikzlibrary{backgrounds}	% drawing the background after the foreground

\begin{document}

\begin{figure}[htbp]
    \centering
    % The state vector is represented by a blue circle.
    % "minimum size" makes sure all circles have the same size
    % independently of their contents.
    \tikzstyle{state}=[circle,
                                        thick,
                                        minimum size=1.2cm,
                                        draw=blue!80,
                                        fill=blue!20]

    % The measurement vector is represented by an orange circle.
    \tikzstyle{measurement}=[circle,
                                                    thick,
                                                    minimum size=1.2cm,
                                                    draw=orange!80,
                                                    fill=orange!25]

    % The control input vector is represented by a purple circle.
    \tikzstyle{input}=[circle,
                                        thick,
                                        minimum size=1.2cm,
                                        draw=purple!80,
                                        fill=purple!20]

    % The input, state transition, and measurement matrices
    % are represented by gray squares.
    % They have a smaller minimal size for aesthetic reasons.
    \tikzstyle{matrx}=[rectangle,
                                        thick,
                                        minimum size=1cm,
                                        draw=gray!80,
                                        fill=gray!20]

    % The system and measurement noise are represented by yellow
    % circles with a "noisy" uneven circumference.
    % This requires the TikZ library "decorations.pathmorphing".
    \tikzstyle{noise}=[circle,
                                        thick,
                                        minimum size=1.2cm,
                                        draw=yellow!85!black,
                                        fill=yellow!40,
                                        decorate,
                                        decoration={random steps,
                                                                segment length=2pt,
                                                                amplitude=2pt}]

    % Everything is drawn on underlying gray rectangles with
    % rounded corners.
    \tikzstyle{background}=[rectangle,
                                                    fill=gray!10,
                                                    inner sep=0.2cm,
                                                    rounded corners=5mm]

    \begin{tikzpicture}[>=latex,text height=1.5ex,text depth=0.25ex]
        % "text height" and "text depth" are required to vertically
        % align the labels with and without indices.
    
    % The various elements are conveniently placed using a matrix:
    \matrix[row sep=0.5cm,column sep=0.5cm] {
        % First line: Control input
        &
            \node (u_k-1) [input]{$\mathbf{u}_{k-1}$}; &
            &
            \node (u_k)   [input]{$\mathbf{u}_k$};     &
            &
            \node (u_k+1) [input]{$\mathbf{u}_{k+1}$}; &
            \\
            % Second line: System noise & input matrix
            \node (w_k-1) [noise] {$\mathbf{w}_{k-1}$}; &
            \node (B_k-1) [matrx] {$\mathbf{B}$};       &
            \node (w_k)   [noise] {$\mathbf{w}_k$};     &
            \node (B_k)   [matrx] {$\mathbf{B}$};       &
            \node (w_k+1) [noise] {$\mathbf{w}_{k+1}$}; &
            \node (B_k+1) [matrx] {$\mathbf{B}$};       &
            \\
            % Third line: State & state transition matrix
            \node (A_k-2)         {$\cdots$};           &
            \node (x_k-1) [state] {$\mathbf{x}_{k-1}$}; &
            \node (A_k-1) [matrx] {$\mathbf{A}$};       &
            \node (x_k)   [state] {$\mathbf{x}_k$};     &
            \node (A_k)   [matrx] {$\mathbf{A}$};       &
            \node (x_k+1) [state] {$\mathbf{x}_{k+1}$}; &
            \node (A_k+1)         {$\cdots$};           \\
            % Fourth line: Measurement noise & measurement matrix
            \node (v_k-1) [noise] {$\mathbf{v}_{k-1}$}; &
            \node (H_k-1) [matrx] {$\mathbf{H}$};       &
            \node (v_k)   [noise] {$\mathbf{v}_k$};     &
            \node (H_k)   [matrx] {$\mathbf{H}$};       &
            \node (v_k+1) [noise] {$\mathbf{v}_{k+1}$}; &
            \node (H_k+1) [matrx] {$\mathbf{H}$};       &
            \\
            % Fifth line: Measurement
            &
            \node (z_k-1) [measurement] {$\mathbf{z}_{k-1}$}; &
            &
            \node (z_k)   [measurement] {$\mathbf{z}_k$};     &
            &
            \node (z_k+1) [measurement] {$\mathbf{z}_{k+1}$}; &
            \\
        };
        
        % The diagram elements are now connected through arrows:
        \path[->]
            (A_k-2) edge[thick] (x_k-1)	% The main path between the
            (x_k-1) edge[thick] (A_k-1)	% states via the state
            (A_k-1) edge[thick] (x_k)		% transition matrices is
            (x_k)   edge[thick] (A_k)		% accentuated.
            (A_k)   edge[thick] (x_k+1)	% x -> A -> x -> A -> ...
            (x_k+1) edge[thick] (A_k+1)
            
            (x_k-1) edge (H_k-1)				% Output path x -> H -> z
            (H_k-1) edge (z_k-1)
            (x_k)   edge (H_k)
            (H_k)   edge (z_k)
            (x_k+1) edge (H_k+1)
            (H_k+1) edge (z_k+1)
            
            (v_k-1) edge (z_k-1)				% Output noise v -> z
            (v_k)   edge (z_k)
            (v_k+1) edge (z_k+1)
            
            (w_k-1) edge (x_k-1)				% System noise w -> x
            (w_k)   edge (x_k)
            (w_k+1) edge (x_k+1)
            
            (u_k-1) edge (B_k-1)				% Input path u -> B -> x
            (B_k-1) edge (x_k-1)
            (u_k)   edge (B_k)
            (B_k)   edge (x_k)
            (u_k+1) edge (B_k+1)
            (B_k+1) edge (x_k+1)
            ;
        
        % Now that the diagram has been drawn, background rectangles
        % can be fitted to its elements. This requires the TikZ
        % libraries "fit" and "background".
        % Control input and measurement are labeled. These labels have
        % not been translated to English as "Measurement" instead of
        % "Messung" would not look good due to it being too long a word.
        \begin{pgfonlayer}{background}
            \node [background,
                        fit=(u_k-1) (u_k+1),
                        label=left:Entrance:] {};
            \node [background,
                        fit=(w_k-1) (v_k-1) (A_k+1)] {};
            \node [background,
                        fit=(z_k-1) (z_k+1),
                        label=left:Measure:] {};
        \end{pgfonlayer}
    \end{tikzpicture}

    \caption{Kalman filter system model}
\end{figure}

This is the system model of the (linear) Kalman filter. At each time
step the state vector $\mathbf{x}_k$ is propagated to the new state
estimation $\mathbf{x}_{k+1}$ by multiplication with the constant state
transition matrix $\mathbf{A}$. The state vector $\mathbf{x}_{k+1}$ is
additionally influenced by the control input vector $\mathbf{u}_{k+1}$
multiplied by the input matrix $\mathbf{B}$, and the system noise vector
$\mathbf{w}_{k+1}$. The system state cannot be measured directly. The
measurement vector $\mathbf{z}_k$ consists of the information contained
within the state vector $\mathbf{x}_k$ multiplied by the measurement
matrix $\mathbf{H}$, and the additional measurement noise $\mathbf{v}_k$.

\end{document}

mammography_bayes+diagram.tex

% Mammography problem from 'Intro to Bayes'
% Author: John Henderson
\documentclass[10pt]{article}
\usepackage{tikz}
%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>
\begin{comment}
:Title: Mammography problem from 'Intro to Bayes'
:Tags: Nodes and Shapes;Node positioning;Text and math;Diagrams;Mathematics
:Author: John Henderson
:Slug: bayes

The following was created in response to reading about "the mammography
problem," a commonly used example illustrating the use of Bayesian
Probability, on Eliezer Yudkowsky's page, "An Intuitive Explanation of
Bayes' Theorem." The visualization presents the problem as involving
"sieves" which behave differently depending on whether the individual
passing through has or does not have cancer, illustrating the split
probability created by the reliability of a mammography (chance of
producing true positives and false positives). The illustration was posted
on LessWrong.com, a site devoted to rationality, created by Yudkowsky.
\end{comment}
\usetikzlibrary{positioning,decorations.pathreplacing,shapes}
\usepackage[english]{babel}
\usepackage{microtype}
\usepackage[hmargin=1.5cm,vmargin=1cm]{geometry}
\usepackage{amsmath}
\DeclareMathOperator{\p}{p}
\newcommand*{\cancer}{\text{cancer}}
\newcommand*{\testp}{\text{test}+}

\begin{document}

\begin{tikzpicture}[%
   % common options for blocks:
   block/.style = {draw, fill=blue!30, align=center, anchor=west,
               minimum height=0.65cm, inner sep=0},
   % common options for the circles:
   ball/.style = {circle, draw, align=center, anchor=north, inner sep=0}]

   % circle illustrating all women
   \node[ball,text width=3cm,fill=purple!20] (all) at (6,0) {All women};

   % two circles showing split of p{cancer} and p{~cancer}
   \node[ball,fill=red!70,text width=0.1cm,anchor=base] (pcan) at (3.5,-5.5) {};
   \node[ball,fill=blue!40,text width=2.9cm,anchor=base] (pncan) at (8.5,-6)
      {Women without cancer\\
      $\p({\sim}\cancer) = 99\%$};

   % arrows showing split from all women to cancer and ~cancer
   \draw[->,thick,draw=red!50] (all.south) to [out=270,in=90] (pcan.north);
   \draw[->,thick,draw=blue!80] (all.south) to [out=270,in=110] (pncan.100);

   % transition from all women to actual cancer rates
   \node[anchor=north,text width=10cm,inner sep=.05cm,align=center,fill=white]
   (why1) at (6,-3.7) {In measuring, we find:};

   % note illustration the p{cancer} circle (text won't fit inside)
   \node[inner sep=0,anchor=east,text width=3.3cm] (note1) at (3.2,-5.5) {
      Women with cancer $\p(\cancer) = 1\%$};

   % draw the sieves
   \node[block,anchor=north,text width=4.4cm,fill=green!50] (tray1) at
      (3.5,-8.8) {\small{$\p(\testp\mid\cancer)=0.8$}};

   \node[block,anchor=north,text width=4.4cm,fill=green!50] (tray2) at
      (8.5,-8.8) {$\p(\testp\mid{\sim}\cancer)=0.096$};

   % text explaining how p{cancer} and p{~cancer} behave as they
   % pass through the sieves
   \node[anchor=west,text width=6cm] (note1) at (-6,-9.1) {
      Now we pass both groups through the sieve; note that both
      sieves are \emph{the same}; they just behave differently
      depending on which group is passing through. \\ 
      Let $\testp=$ a positve mammography.};

   % arrows showing the circles passing through the seives
   \draw[->,thick,draw=red!80] (3.5,-5.9) -- (3.5,-8.6);
   \draw[->,thick,draw=blue!50] (8.5,-8.1) -- (8.5,-8.6);

   % numerator
   \node[ball,text width=0.05cm,fill=red!70] (can) at (6,-10.5) {};

   % dividing line
   \draw[thick] (5,-11) -- (7,-11);

   % demoniator
   \node[ball,text width=0.39cm,fill=blue!40,anchor=base] (ncan) at (6.5,-11.5) {};
   \node[ball,text width=0.05cm,fill=red!70,anchor=base] (can2) at (5.5,-11.5) {};

   % plus sign in denominator
   \draw[thick] (5.9,-11.4) -- (5.9,-11.6);
   \draw[thick] (5.8,-11.5) -- (6,-11.5);

   % arrows showing the output of the sieves formed the fraction
   \draw[->,thick,draw=red!80] (tray1.south) to [out=280,in=180] (can);
   \draw[->,thick,draw=red!80] (tray1.south) to [out=280,in=180] (can2);
   \node[anchor=north,inner sep=.1cm,align=center,fill=white] (why2) at
      (3.8,-9.8) {$1\% * 80\%$};

   \draw[->,thick,draw=blue!50] (tray2.south) to [out=265,in=0] (ncan);
   \node[anchor=north,inner sep=.1cm,align=center,fill=white] (why2) at
      (8.4,-9.8) {$99\% * 9.6\%$};

   % explanation of final formula
   \node[anchor=north west,text width=6.5cm] (note2) at (-6,-12.5)
      {Finally, to find the probability that a positive test
         \emph{actually means cancer}, we look at those who passed
         through the sieve \emph{with cancer}, and divide by all who
         received a positive test, cancer or not.}; 

   % illustrated fraction turned into math
   \node[anchor=north,text width=10cm] (solution) at (6,-12.5) {
   \begin{align*}
         \frac{\p(\testp\mid\cancer)}{\p(\testp\mid\cancer)
         + \p(\testp\mid{\sim}\cancer)} &= \\
         \frac{1\% * 80\%}{(1\% * 80\%) + (99\% * 9.6\%)} &= 7.8\%
         = \p(\cancer\mid\testp)
      \end{align*}};
\end{tikzpicture}
\end{document}

mapper-reducer.tex

% https://tex.stackexchange.com/a/52703/173708

% (S) -> (M) -> (V) -> (shuffle) -> (P) -> (R) - (F)
% S for Start F for Final
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{%
  calc,
  fit,
  shapes,
  backgrounds
}
% the next macro is useful to create a table
\newcommand\tabins[3]{%
 \tikz[baseline=(Tab.base)] 
           \node  [rectangle split, 
                   rectangle split parts=3, 
                   draw, 
                   align=right,
                   inner sep=.5em,
                   rectangle split horizontal] (Tab)
                           {\hbox to 4ex{#1}
           \nodepart{two}  {\hbox to 8ex{\hfill #2\$}}  
           \nodepart{three}{\hbox to 3ex{#3}}}; 
}

\begin{document}
\parindent=0pt

\begin{tikzpicture}[%
    %every node/.style={transform shape},% now it's not necessary but good for a poster
    x=1.25cm,y=2cm,  
    font=\footnotesize,
    % every group of nodes have a style except for main, the style is named by a letter
    main/.style={draw,fill=yellow,inner sep=.5em},
    R/.style={draw,fill=purple!40!blue!30,inner sep=.5em},
    M/.style={draw,fill=green!80!yellow,inner sep=.5em},
    S/.style={anchor=east},
    V/.style={anchor=west},
    P/.style={anchor=center},
    F/.style={anchor=west}
    ]

  % main node the reference Shuffle 
  \node[main] (shuffle) {Group};
  %group R reducer
  \node[R] at ($(shuffle)+(8,1)$)    (R1+) {Reduce};
  \node[R] at ($(shuffle)+(8, 0)$)   (R0)  {Reduce};
  \node[R] at ($(shuffle)+(8,-1)$)   (R1-) {Reduce};
  % group M Mapper
  \node[M] at ($(shuffle)+(-6,+2.5)$)   (M3+)  {Map};
  \node[M] at ($(shuffle)+(-6,+ 1.5)$)  (M2+)  {Map};
  \node[M] at ($(shuffle)+(-6,+ .5)$)   (M1+)  {Map};
  \node[M] at ($(shuffle)+(-6,- .5)$)   (M1-)  {Map};
  \node[M] at ($(shuffle)+(-6,- 1.5)$)  (M2-)  {Map};
  \node[M] at ($(shuffle)+(-6,-2.5)$)   (M3-)  {Map};
  % group S Start the first nodes
  \node[S] at ($(M3+)+(-1.5,0)$)  (S3+) {\Big($k_1$,\tabins{4711}{59.90}{NY}\Big)};
  \node[S] at ($(M2+)+(-1.5,0)$)  (S2+) {\Big($k_2$,\tabins{4713}{142.99}{CA}\Big)};
  \node[S] at ($(M1+)+(-1.5,0)$)  (S1+) {\Big($k_3$,\tabins{4714}{72.00}{NY}\Big)}; 
  \node[S] at ($(M1-)+(-1.5,0)$)  (S1-) {\Big($k_4$,\tabins{4715}{108.75}{NY}\Big)}; 
  \node[S] at ($(M2-)+(-1.5,0)$)  (S2-) {\Big($k_5$,\tabins{4718}{19.89}{WA}\Big)};  
  \node[S] at ($(M3-)+(-1.5,0)$)  (S3-) {\Big($k_6$,\tabins{4719}{36.60}{CA}\Big)};  
  % group V  why not
  \node[V] at ($(M3+)+(1.5,0)$)  (V3+) {\Big(NY,59.90\$\Big)};
  \node[V] at ($(M2+)+(1.5,0)$)  (V2+) {\Big(CA,142.99\$\Big)};
  \node[V] at ($(M1+)+(1.5,0)$)  (V1+) {\Big(NY,72.00\$\Big)}; 
  \node[V] at ($(M1-)+(1.5,0)$)  (V1-) {\Big(NY,108.75\$\Big)}; 
  \node[V] at ($(M2-)+(1.5,0)$)  (V2-) {\Big(WA,19.89\$\Big)};  
  \node[V] at ($(M3-)+(1.5,0)$)  (V3-) {\Big(CA,36.60\$\Big)};   

  \node[P] at ($(R1+)+(-4,0)$) (P1+) {\Big(CA,\big[142.99\$,36.60\$\big]\Big)};
  \node[P] at ($(R0) +(-4,0)$) (P0)  {\Big(NY,\big[59.90\$,72.00\$,108.75\big]\Big)};
  \node[P] at ($(R1-)+(-4,0)$) (P1-) {\Big(WA,\big[19.89\$\big]\Big)}; 

  \node[F] (F1+) at ($(R1+)+(1.5,0)$) {(CA,89.80\$)};
  \node[F] (F0)  at ($(R0) +(1.5,0)$) {(NY,80.22\$)}; 
  \node[F] (F1-) at ($(R1-)+(1.5,0)$) {(WA,72.00\$)}; 

  % wrappers
  \begin{scope}[on background layer]
      \node[fill=lightgray!50,inner sep = 4mm,fit=(shuffle),label=above:Shuffle] {}; 
  \end{scope} 
  \begin{scope}[on background layer]
      \node[fill=lightgray!50,inner sep = 4mm,fit=(R1+)(R1-),label=above:Reducer] {}; 
  \end{scope}  
  \begin{scope}[on background layer]
      \node[fill=lightgray!50,inner sep = 4mm,fit=(M3+)(M3-),label=above:Mapper] {}; 
  \end{scope}

  %edges

  \foreach \indice in {3+,2+,1+,1-,2-,3-} \draw[->] (S\indice.east) -- (M\indice.west); 
  \foreach \indice in {3+,2+,1+,1-,2-,3-} \draw[->] (M\indice.east) -- (V\indice.west);
  \foreach \indice in {3+,2+,1+,1-,2-,3-} \draw[->] (V\indice.east) to [out=0,in=180] (shuffle.west); 
  \foreach \indice in {1+,0,1-} \draw[->] (shuffle.east) to [out=0,in=180] (P\indice.west);  
  \foreach \indice in {1+,0,1-} \draw[->] (P\indice.east) -- (R\indice.west);
  \foreach \indice in {1+,0,1-} \draw[->] (R\indice.east) -- (F\indice.west);   
\end{tikzpicture} 

\end{document}

matrix-highlighting.tex

% Highlighting elements in matrices
% Author: Stefan Kottwitz
% \documentclass{article}
\documentclass[preview]{standalone}
\usepackage{tikz}
\usetikzlibrary{fit}

\tikzset{%
  highlight/.style={rectangle,rounded corners,fill=red!15,draw,fill opacity=0.5,thick,inner sep=0pt}
}
\newcommand{\tikzmark}[2]{\tikz[overlay,remember picture,baseline=(#1.base)] \node (#1) {#2};}
%
\newcommand{\Highlight}[1][submatrix]{%
    \tikz[overlay,remember picture]{
    \node[highlight,fit=(left.north west) (right.south east)] (#1) {};}
}

\begin{document}

\[
  M = \left(\begin{array}{*5{c}}
    \tikzmark{left}{1} & 2 & 3 & 4 & 5\\
    6 & 7 & 8 & 9 & 10 \\
    11 & 12 & \tikzmark{right}{13} & 14 & 15 \\
    16 & 17 & 18 & 19 & 20
  \end{array}\right)
  \Highlight[first]
  \qquad
  M^T = \left(\begin{array}{*5{c}}
    \tikzmark{left}{1} & 6 & 11 & 16 \\
    2 & 7 & 12 & 17 \\
    3 & 8 & \tikzmark{right}{13} & 18 \\
    4 & 9 & 14 & 19 \\
    5 & 10 & 15 & 20
  \end{array}\right)
\]
\Highlight[second]

\tikz[overlay,remember picture] {
  \draw[->,thick,red,dashed] (first) -- (second) node [pos=0.66,above] {Transpose};
  \node[above of=first] {$N$};
  \node[above of=second] {$N^T$};
}
\end{document}�

matrix-product.tex

% https://tex.stackexchange.com/questions/264260/matrix-product-illustration?noredirect=1&lq=1
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{matrix,arrows.meta,positioning}

\definecolor{myyellow}{RGB}{240,217,1}
\definecolor{mygreen}{RGB}{143,188,103}
\definecolor{myred}{RGB}{234,38,40}
\definecolor{myblue}{RGB}{53,101,167}

\begin{document}

\begin{tikzpicture}[
  mymatrix/.style={
    matrix of math nodes,
    outer sep=0pt,
    nodes={
      draw,
      text width=2.5em,
      align=center,
      minimum height=2.5em,
      text=gray
    },
    nodes in empty cells,
    column sep=-\pgflinewidth,
    row sep=-\pgflinewidth,
    left delimiter=[,
    right delimiter=],
    },
    mycircle/.style 2 args={
      draw=#1,
      circle,
      fill=#2,
      line width=2pt,
      inner sep=5pt
    },
    arr/.style={
    line width=4pt,
    -{Triangle[angle=60:1.5pt 3]},
    #1,
    shorten >= 3pt,
    shorten <= 3pt
    }
  ]
  %the matrices
  \matrix[mymatrix] (A)
  {
  |[text=black]|a_{11} & |[text=black]|a_{12} \\
  a_{21} & a_{22} \\
  |[text=black]|a_{31} & |[text=black]|a_{32} \\
  a_{41} & a_{42} \\
  };
  \matrix[mymatrix,right=of A.north east,anchor=north west] (prod)
  {
  & & \\
  & & \\
  & & \\
  & & \\
  };
  \matrix[mymatrix,above=of prod.north west,anchor=south west] (B)
  {
  b_{11} & |[text=black]|b_{12} & |[text=black]|b_{13} \\
  b_{21} & |[text=black]|b_{22} & |[text=black]|b_{23} \\
  };

  %the labels for the matrices
  \node[font=\huge,left=10pt of A] {$A$};
  \node[font=\huge,above=2pt of B] {$B$};

  %the frames in both matrices
  \draw[myyellow,line width=2pt]
    ([shift={(1.2pt,-1.2pt)}]A-1-1.north west) 
    rectangle 
    ([shift={(-1.2pt,1.2pt)}]A-1-2.south east);
  \draw[myyellow,line width=2pt]
    ([shift={(1.2pt,-1.2pt)}]B-1-2.north west) 
    rectangle 
    ([shift={(-1.2pt,1.2pt)}]B-2-2.south east);
  \draw[mygreen,line width=2pt]
    ([shift={(1.2pt,-1.2pt)}]A-3-1.north west) 
    rectangle 
    ([shift={(-1.2pt,1.2pt)}]A-3-2.south east);
  \draw[mygreen,line width=2pt]
    ([shift={(1.2pt,-1.2pt)}]B-1-3.north west) 
    rectangle 
    ([shift={(-1.2pt,1.2pt)}]B-2-3.south east);

  %the filled circles in the product
  \node[mycircle={myblue}{mygreen}]
    at (prod-3-3) (prod33) {};
  \node[mycircle={myred}{myyellow}]
    at (prod-1-2) (prod12) {};

  %the arrows
  \draw[arr=myred]
    (A-1-2.east) -- (prod12); 
  \draw[arr=myred]
    (B-2-2.south) -- (prod12); 
  \draw[arr=myblue]
    (A-3-2.east) -- (prod33); 
  \draw[arr=myblue]
    (B-2-3.south) -- (prod33); 

  %the legend
  \matrix[
    matrix of math nodes,
    nodes in empty cells,
    column sep=10pt,
    anchor=north,
    nodes={
      minimum height=2.2em,
      minimum width=2em,
      anchor=north west
    },
    below=5pt of current bounding box.south
    ] 
    (legend)
  {
    & a_{11}b_{12} + a_{12}b_{22} \\
    & a_{31}b_{13} + a_{32}b_{23} \\
  };
  \node[mycircle={myblue}{mygreen}]
    at (legend-2-1) {};
  \node[mycircle={myred}{myyellow}]
    at (legend-1-1) {};
\end{tikzpicture}

\end{document}

matrix-spreadsheet_formula+matrix+command.tex

% https://tex.stackexchange.com/a/266113/173708
\documentclass[border=3mm,tikz]{standalone}
%\documentclass{article}
\usepackage{amsmath}
\usepackage{tikz}
\usetikzlibrary{matrix}

\newcommand\funsum{}
\newcommand\scell[2]{}
\newcommand\inmblue[1]{}

\colorlet{mlightgray}{lightgray}

\begin{document}
\begin{tikzpicture}[cell/.style={rectangle,draw=black}, nodes in empty cells]
  \matrix[
  matrix of math nodes,
  row sep =-\pgflinewidth,
  column sep = -\pgflinewidth,
  nodes={anchor=center, minimum width=2cm, cell},
  column 1/.style = {nodes={minimum width=1cm, fill=mlightgray}},
  column 2/.style = {nodes={minimum width=3cm}},
  row 1/.style = {nodes={text height=1.3ex, text depth=0, fill=mlightgray}},
  row 2/.style = {text height=1.3ex, text depth=0},
  row 3/.style = {text height=1.3ex, text depth=0},
  row 4/.style = {text height=1.3ex, text depth=0},
  row 5/.style = {text height=1.3ex, text depth=0},  
  row 6/.style = {text height=1.3ex, text depth=0},
  ] (m)
  {   &  \text{1}   \\
    \text{1} & =20  \\
    \text{2} & =90  \\
    \text{3} & =110 \\
    \text{4} & =80  \\
    \text{5} & = {\scriptstyle \funsum(\scell{1}{1}:\scell{4}{1})} \\
  };
  \node[font=\Large,anchor=south] at (m.north) {\inmblue{Formulas}};
  \draw[blue,-latex] 
    ([xshift=-1.5pt]m-2-2.center) -- ([xshift=-1.5pt]m-6-2.center); 
  \foreach \x in {2,...,5}
    {\fill[blue] ([xshift=-1.5pt]m-\x-2.center) circle (1.25pt);} 
  \draw[blue,-latex] 
    ([xshift=-5pt]m-2-2.east) -- ([xshift=-5pt]m-6-2.east); 
  \foreach \x in {2,...,5}
    {\fill[blue] ([xshift=-5pt]m-\x-2.east) circle (1.25pt);} 
\end{tikzpicture}

\end{document}

mind_2nd_level_concentric+mindmap.tex

% https://tex.stackexchange.com/q/232816/173708
\documentclass[tikz,border=9]{standalone}
\usetikzlibrary{mindmap}
\usepackage{xspace}
\definecolor{joli}{RGB}{225,95,0}
\definecolor{JOLI}{RGB}{225,95,0}
\newcommand\etoc{\textcolor{joli}{\ttfamily\bfseries etoc}\xspace}
\DeclareRobustCommand\csa[1]{{\ttfamily\hyphenchar\font45 \char`\\ #1}}

\newcount\tikznumberofcurrentgrandchild

\def\tikzmycustomgrowth {%
  \pgftransformreset
  \ifnum\tikztreelevel=1
    \pgftransformrotate {(\pgfkeysvalueof{/tikz/sibling angle})*(\tikznumberofcurrentchild-1)}%
  \fi
  \ifnum\tikztreelevel=2
    \pgftransformrotate {(\pgfkeysvalueof{/tikz/sibling angle})*(\tikznumberofcurrentgrandchild-4)}%
    \global\advance\tikznumberofcurrentgrandchild by 1
 \fi
 \pgftransformxshift {\the\tikzleveldistance}%
}
\tikzset{
    branch color/.style={
        concept color=#1!white,
        every child/.append style={concept color=#1!white!30!white},
    }
}

\begin{document}
\begin{tikzpicture}
  [
    mindmap,
    growth function=\tikzmycustomgrowth,
    nodes={concept},
    concept color=orange!60,
    root concept/.append style={font=\huge, minimum size=5.5cm},
    level 1/.append style={level distance=6.5cm, sibling angle=360/8},
    level 1 concept/.append style={font=\Large,minimum size=4cm},
    level 2/.append style={level distance=12.5cm, sibling angle=360/35},
    % distance par rapport au CENTRE ! (avec le code tel qu'en ce moment)
  ]
  \tikznumberofcurrentgrandchild=0
  \node [root concept]{The \etoc package} 
  child [branch color=teal!60]{node {I Overview} 
  child {node {3 Do I need to be a geek to use {\color {joli}\ttfamily \bfseries etoc}\xspace ?}} 
  child {node {4 Line styles and toc display style}} 
  child {node {5 A first example}} 
  child {node {6 A second example}} 
  child {node {7 Linked list of the main package commands}}} 
  child [branch color=yellow!80]{node {II Arbitrarily many TOCs, and local ones too} 
  child {node {8 Labeling and reusing elsewhere}} 
  child {node {9 A powerful functionality of {\color {joli}\ttfamily \bfseries etoc}\xspace : the re-assignment of levels with \csa {etocsetlevel}}} 
  child {node {10 The \csa {etoc\discretionary {-}{}{}set\discretionary {-}{}{}toc\discretionary {-}{}{}depth} and \csa {etoc\discretionary {-}{}{}set\discretionary {-}{}{}next\discretionary {-}{}{}toc\discretionary {-}{}{}depth} commands}} 
  child {node {11 The command \csa {etoc\discretionary {-}{}{}set\discretionary {-}{}{}toc\discretionary {-}{}{}dep\discretionary {-}{}{}th.toc}}} 
  child {node {12 The commands \csa {etoc\discretionary {-}{}{}depth\discretionary {-}{}{}tag.toc} and \csa {etocsettagdepth}}} 
  child {node {13 Adding commands to the \texttt {.toc} file}} 
  child {node {14 Two Examples}}} 
  child [branch color=green!50]{node {III Surprising uses of {\color {joli}\ttfamily \bfseries etoc}\xspace } 
  child {node {15 The TOC of TOCs}} 
  child {node {16 Arbitrary ``Lists Of...'', \csa {etoctoccontentsline}}} 
  child {node {17 A TOC with a fancy layout}} 
  child {node {18 Another compatibility mode}} 
  child {node {19 The TOC as a tree}} 
  child {node {20 The TOC as a molecule}} 
  child {node {21 The TOC as a TikZ Mindmap}} 
  child {node {22 The TOC as a table}}} 
  child [branch color=teal!60]{node {IV Commands for the toc line styles} 
  child {node {23 The \csa {etocsetstyle} command}} 
  child {node {24 The \csa {etocsetlevel} command}} 
  child {node {25 Scope of commands added to the \texttt {.toc} file}} 
  child {node {26 Am I also red?}}} 
  child [branch color=yellow!80]{node {V Commands for the toc display style} 
  child {node {27 Specifying the toc display style}} 
  child {node {28 Starred variants of the \csa {tableofcontents} etc... commands}} 
  child {node {29 Table of contents for this part}}} 
  child [branch color=green!50]{node {VI Using and customizing {\color {joli}\ttfamily \bfseries etoc}\xspace } 
  child {node {30 Summary of the main style commands}} 
  child {node {31 The package default line styles: \csa {etocdefaultlines}}} 
  child {node {32 Customizing {\color {joli}\ttfamily \bfseries etoc}\xspace }} 
  child {node {33 One more example of colored TOC layout}}} 
  child [branch color=teal!60]{node {VII Tips} 
  child {node {34 ... and tricks}}} 
  child [branch color=yellow!80]{node {VIII The code} 
  child {node {35 Timestamp}} 
  child {node {36 Change history}} 
  child {node {37 Implementation}}} ;
\end{tikzpicture}
\end{document}

mind_2nd_level_reactangular_frame+mindmap.tex

% https://tex.stackexchange.com/a/232914/173708
\documentclass[tikz,border=9]{standalone}
\usetikzlibrary{mindmap}
\usepackage{xspace}
\definecolor{joli}{RGB}{225,95,0}
\definecolor{JOLI}{RGB}{225,95,0}
\newcommand\etoc{\textcolor{joli}{\ttfamily\bfseries etoc}\xspace}
\DeclareRobustCommand\csa[1]{{\ttfamily\hyphenchar\font45 \char`\\ #1}}

\newcount\tikznumberofcurrentgrandchild

\def\tikzretangulargroth{%
    \pgftransformreset
    \ifnum\tikztreelevel=1
        \pgftransformrotate{55+((\pgfkeysvalueof{/tikz/sibling angle})*(\tikznumberofcurrentchild)}%
        \pgftransformxshift{\the\tikzleveldistance}%
    \fi
    \ifnum\tikztreelevel=2
        \pgfmathsetmacro\tikzoffsetofcurrentchild{(\tikzsiblingdistance)*(\tikznumberofcurrentgrandchild)}%
        \ifdim\tikzoffsetofcurrentchild pt<\tikzlevelwidth pt
            \pgftransformxshift{\tikzlevelwidth/2-\tikzoffsetofcurrentchild}
            \pgftransformyshift{\tikzlevelheight/2}
        \else
        \pgfmathsetmacro\tikzoffsetofcurrentchild{\tikzoffsetofcurrentchild-\tikzlevelwidth}%
        \ifdim\tikzoffsetofcurrentchild pt<\tikzlevelheight pt
            \pgftransformxshift{-\tikzlevelwidth/2}
            \pgftransformyshift{\tikzlevelheight/2-\tikzoffsetofcurrentchild}
        \else
        \pgfmathsetmacro\tikzoffsetofcurrentchild{\tikzoffsetofcurrentchild-\tikzlevelheight}%
        \ifdim\tikzoffsetofcurrentchild pt<\tikzlevelwidth pt
            \pgftransformxshift{-\tikzlevelwidth/2+\tikzoffsetofcurrentchild}
            \pgftransformyshift{-\tikzlevelheight/2}
        \else
        \pgfmathsetmacro\tikzoffsetofcurrentchild{\tikzoffsetofcurrentchild-\tikzlevelwidth}%
        \ifdim\tikzoffsetofcurrentchild pt<\tikzlevelheight pt
            \pgftransformxshift{\tikzlevelwidth/2}
            \pgftransformyshift{-\tikzlevelheight/2+\tikzoffsetofcurrentchild}
        \fi\fi\fi\fi
        \global\advance\tikznumberofcurrentgrandchild by1
    \fi
}
\tikzset{
    branch color/.style={
        concept color=#1!white,
        every child/.append style={concept color=#1!white!30!white},
    },
    level width/.store in=\tikzlevelwidth,
    level height/.store in=\tikzlevelheight
}

\begin{document}
\tikznumberofcurrentgrandchild=0

\begin{tikzpicture}[
    mindmap,
    growth function=\tikzretangulargroth,
    nodes={concept},
    concept color=orange!60,
    root concept/.append style={font=\huge, minimum size=5.5cm},
    level 1/.append style={level distance=6.5cm, sibling angle=360/8},
    level 1 concept/.append style={font=\Large,minimum size=4cm},
    level 2/.append style={level width=20cm,level height=28.7cm, sibling distance=2.77cm},
                                        % A4 paper with margin=.5cm
    ]
    \node [root concept]{The \etoc package} 
    child [branch color=teal!60]{node {I Overview} 
        child {node {3 Do I need to be a geek to use {\color {joli}\ttfamily \bfseries etoc}\xspace ?}} 
        child {node {4 Line styles and toc display style}} 
        child {node {5 A first example}} 
        child {node {6 A second example}} 
        child {node {7 Linked list of the main package commands}}
    } 
    child [branch color=yellow!80]{node {II Arbitrarily many TOCs, and local ones too} 
        child {node {8 Labeling and reusing elsewhere}} 
        child {node {9 A powerful functionality of {\color {joli}\ttfamily \bfseries etoc}\xspace : the re-assignment of levels with \csa {etocsetlevel}}} 
        child {node {10 The \csa {etoc\discretionary {-}{}{}set\discretionary {-}{}{}toc\discretionary {-}{}{}depth} and \csa {etoc\discretionary {-}{}{}set\discretionary {-}{}{}next\discretionary {-}{}{}toc\discretionary {-}{}{}depth} commands}} 
        child {node {11 The command \csa {etoc\discretionary {-}{}{}set\discretionary {-}{}{}toc\discretionary {-}{}{}dep\discretionary {-}{}{}th.toc}}} 
        child {node {12 The commands \csa {etoc\discretionary {-}{}{}depth\discretionary {-}{}{}tag.toc} and \csa {etocsettagdepth}}} 
        child {node {13 Adding commands to the \texttt {.toc} file}} 
        child {node {14 Two Examples}}
    } 
    child [branch color=green!50]{node {III Surprising uses of {\color {joli}\ttfamily \bfseries etoc}\xspace } 
        child {node {15 The TOC of TOCs}} 
        child {node {16 Arbitrary ``Lists Of...'', \csa {etoctoccontentsline}}} 
        child {node {17 A TOC with a fancy layout}} 
        child {node {18 Another compatibility mode}} 
        child {node {19 The TOC as a tree}} 
        child {node {20 The TOC as a molecule}} 
        child {node {21 The TOC as a TikZ Mindmap}} 
        child {node {22 The TOC as a table}}
    } 
    child [branch color=teal!60]{node {IV Commands for the toc line styles} 
        child {node {23 The \csa {etocsetstyle} command}} 
        child {node {24 The \csa {etocsetlevel} command}} 
        child {node {25 Scope of commands added to the \texttt {.toc} file}} 
        child {node {26 Am I also red?}}
    } 
    child [branch color=yellow!80]{node {V Commands for the toc display style} 
        child {node {27 Specifying the toc display style}} 
        child {node {28 Starred variants of the \csa {tableofcontents} etc... commands}} 
        child {node {29 Table of contents for this part}}
    } 
    child [branch color=green!50]{node {VI Using and customizing {\color {joli}\ttfamily \bfseries etoc}\xspace } 
        child {node {30 Summary of the main style commands}} 
        child {node {31 The package default line styles: \csa {etocdefaultlines}}} 
        child {node {32 Customizing {\color {joli}\ttfamily \bfseries etoc}\xspace }} 
        child {node {33 One more example of colored TOC layout}}
    } 
    child [branch color=teal!60]{node {VII Tips} 
        child {node {34 ... and tricks}}
    } 
    child [branch color=yellow!80]{node {VIII The code} 
        child {node {35 Timestamp}} 
        child {node {36 Change history}} 
        child {node {37 Implementation}}
    }
    ;
\end{tikzpicture}
\end{document}

mind_adjust_keys+mindmap.tex

% https://tex.stackexchange.com/a/153934/173708
\documentclass[article, a4paper, 12pt, oneside]{memoir}
\usepackage{tikz}
\usetikzlibrary{mindmap}
\pagestyle{empty}
\begin{document}
\begin{tikzpicture}[grow cyclic, text width=2cm, align=flush center, every node/.style=concept, concept color=orange!40,
level 1/.style={level distance=7cm,sibling angle=90},
level 2/.style={level distance=4cm,sibling angle=45}]

\node{ShareLaTeX Tutorial Videos}
   child [concept color=blue!30] { node {Beginners Series}
        child { node {First Document}}
        child { node {Sections and Paragraphs}}
        child { node {Mathematics}}
        child { node {Images}}
        child { node {bibliography}}
        child { node {Tables and Matrices}}
        child { node {Longer Documents}}
    }
    child [concept color=yellow!30] { node {Thesis Series}
        child { node {Basic Structure}}
        child { node {Page Layout}}
        child { node {Figures, Subfigures and Tables}}
        child { node {Biblatex}}
        child { node {Title Page}}
    }
    child [concept color=teal!40]  { node {Beamer Series}
        child { node {Getting Started}}
        child { node {Text, Pictures and Tables}}
        child { node {Blocks, Code and Hyperlinks}}
        child { node {Overlay Specifications}}
        child { node {Themes and Handouts}}
    }
    child [concept color=purple!50] { node {TikZ Series}
        child { node {Basic Drawing}}
        child { node {Geogebra}}
        child { node {Flow Charts}}
        child { node {Circuit Diagrams}}
        child [concept color=green!40]  { node {Mind Maps}}
    };

\end{tikzpicture}

\end{document}

mind_child_manipulation+mindmap.tex

\PassOptionsToPackage{rgb}{xcolor}
\documentclass[tikz,border=10pt]{standalone}
\usetikzlibrary{mindmap}
\begin{document}

\begin{tikzpicture}
  \path
  [
    mindmap,
    grow cyclic,
    every node/.style=concept,
    concept color=black!10,
    level 1/.append style={level distance=5cm, sibling angle=90},
    level 2/.append style={level distance=3cm, sibling angle=45},
    root concept/.append style={concept, concept color=black!10},
  ]
  node [root concept] {Lorem}
   child [concept color=cyan!40] { node {Ipsum}
        child [level distance=40mm] { node {Lorem ipsum dolor sit amet, consectetur adipiscing elit. Lorem ipsum dolor sit amet}
            child [level distance=35mm] { node {sit}}
               }
        child { node {amet}
            child { node {consectetur}}
            child { node {adipiscing}}
            child { node {elit}}
        }
        child { node {Aliquam}
            child { node {tincidunt}}
            child { node {interdum}}
            child { node {faucibus}}
               }
        child [style={sibling angle=50}] { node {Curabitur}
            child{ node {id}}
               }
    }
    child [concept color=yellow!50] { node {malesuada}
        child { node {}}
        child { node {}}
        child { node {}}
        child { node {}}
        child { node {}}
    }
    child [concept color=red!40] { node {adipiscing}
        child { node {}}
        child { node {}}
        child { node {}}
        child { node {}}
        child { node {}}
    }
    child [concept color=green!50] { node {elit}
        child { node {}}
        child { node {}}
        child { node {}}
        child { node {}}
        child { node {}}
    };
\end{tikzpicture}
\end{document}

mind_children_two+mindmap.tex

% Modified by ARR to show two pictues in the same page
% changed page size; no page number
% use figure for each tizkz

% Unit circle
% Author: The Author
% What this does
\documentclass{article}
\usepackage[paperheight=6in,paperwidth=6in]{geometry}
\usepackage{tikz}


\usetikzlibrary{mindmap}

\pagestyle{empty}  % no page number

%\usepackage[top=1in,bottom=1in,right=1in,left=1in]{geometry} % margins

\begin{document}

\begin{figure}
	\begin{tikzpicture}[small mindmap,concept color=blue!80]
	\node [concept] {Root concept 1}
	child[clockwise from=0] {node[concept] {child}}
	child[clockwise from=270] {node[concept] {child}};
	\begin{scope}[concept color=red!80]
	\node [concept] at (5.6,0) {Root concept 2}
	child[clockwise from=180] {node[concept,opacity=0.5] {child}}
	child[grow=230 ] {node[concept] {child}}
	child[grow=270 ] {node[concept] {child}};
	\end{scope}
	\end{tikzpicture} 
\end{figure}

\begin{figure}
	\begin{tikzpicture}[small mindmap,concept color=blue!80]
	\node (n1) [concept] {Root concept 1}
	child[clockwise from=270] {node[concept] {child}}
	child[clockwise from=270] {node[concept] {child}};
	\begin{scope}[concept color=red]
	\node (n2) [concept] at (5,0) {Root concept 2}
	child[clockwise from=225] {node[concept, concept color=magenta] (c1) {child}}
	child[grow=0 ] {node[concept] {child}};
	\end{scope}
	
	\path (n1) to [circle connection bar switch color=from (blue!80) to (magenta)] (c1);
	\end{tikzpicture} 
\end{figure}

\end{document}

mind_circle_connection+mindmap.tex

\documentclass[tikz,border=10pt]{standalone}
%\documentclass[crop, tikz]{standalone}

\usepackage{tikz}

\begin{document}
	
\usetikzlibrary{mindmap}
\begin{tikzpicture}[outer sep=0pt]
    \node (n1) at (0,0) [circle,minimum size=2cm,fill,draw,thick,red] {};
    \node (n2) at (30:2.5) [circle,minimum size=1cm,fill,draw,thick,blue] {};

    \path (n1) to[circle connection bar switch color=from (red) to (blue)] (n2);
\end{tikzpicture}
	
\end{document}

mind_clip+mindmap.tex

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{mindmap}

\begin{document}

\begin{tikzpicture}[
    mindmap,
    every node/.style={concept, execute at begin node=\hskip0pt},
    root concept/.append style={
      concept color=black, fill=white, line width=1ex, text=black
    },
    text=white, grow cyclic,
    level 1/.append style={level distance=4.5cm,sibling angle=90},
    level 2/.append style={level distance=3cm,sibling angle=45}
  ]
  \clip (0,-1) rectangle ++(4,5);
  \node [root concept] {Computational Complexity}
    child [concept color=red] { node {Computational Problems}
      child { node {Problem Measures} } 
    }
    child [concept color=blue] { node {Computational Models}
      child { node {Turing Machines} }
    }
    child [concept color=orange] { node {Measuring Complexity}
      child { node {Complexity Measures} }
    }
    child [concept color=green!50!black] { node {Solving Problems}
      child { node {Exact Algorithms} }
    };
\end{tikzpicture}

\end{document}

mind_computer_science+mindmap.tex

% changed by ARR
% added margins and page size to fit picture full
% Author: Till Tantau
% Source: The PGF/TikZ manual
\documentclass{article}
\usepackage[paperheight=6in,paperwidth=7in,top=0.5in, bottom=0.5in, left=0.5in, right=0.5in]{geometry}
\pagestyle{empty}

\usepackage{tikz}
\usetikzlibrary{mindmap,trees}

\begin{document}

\begin{tikzpicture}
  \path[mindmap,concept color=black,text=white]
    node[concept] {Computer Science}
    [clockwise from=0]
    child[concept color=green!50!black] {
      node[concept] {practical}
      [clockwise from=90]
      child { node[concept] {algorithms} }
      child { node[concept] {data structures} }
      child { node[concept] {pro\-gramming languages} }
      child { node[concept] {software engineer\-ing} }
    }  
    child[concept color=blue] {
      node[concept] {applied}
      [clockwise from=-30]
      child { node[concept] {databases} }
      child { node[concept] {WWW} }
    }
    child[concept color=red] { node[concept] {technical} }
    child[concept color=orange] { node[concept] {theoretical} };
\end{tikzpicture}
\end{document}

mind_connecting_concepts+mindmap.tex

\documentclass[tikz,border=10pt]{standalone}
%\documentclass[crop, tikz]{standalone}

\usepackage{tikz}
% needed for Mindmap
\usetikzlibrary{mindmap}

\pgfdeclarelayer{background}
\pgfsetlayers{background,main}

\begin{document}
	
\begin{tikzpicture}
	[root concept/.append style={concept color=blue!20,minimum size=2cm},
	level 1 concept/.append style={sibling angle=45},
	mindmap]
	\node [concept] {Root concept}
	[clockwise from=45]
	child { node[concept] (c1) {child}}
	child { node[concept] (c2) {child}}
	child { node[concept] (c3) {child}};
	\begin{pgfonlayer}{background}
	\draw [concept connection] (c1) edge (c2)
	edge (c3)
	(c2) edge (c3);
	\end{pgfonlayer}
\end{tikzpicture}

\end{document}

mind_fixed+mindmap.tex

% https://tex.stackexchange.com/a/153942/173708
\documentclass[article, 12pt, oneside]{memoir}

\usepackage[a2paper]{geometry}
\usepackage{tikz}
\usetikzlibrary{mindmap}
\pagestyle{empty}
\begin{document}
\begin{tikzpicture}[
    mindmap,
    grow cyclic, text width=4cm, align=flush center,
    every node/.style={concept},
    concept color=orange!40,
    level 1/.style={level distance=10cm,sibling angle=90},
    level 2/.style={level distance=6cm,sibling angle=45}]

    \node [root concept] {ShareLaTeX Tutorial Videos}
   child [concept color=blue!30] { node {Beginners Series}
        child { node {First Document}}
        child { node {Sections and Paragraphs}}
        child { node {Mathematics}}
        child { node {Images}}
        child { node {bibliography}}
        child { node {Tables and Matrices}}
        child { node {Longer Documents}}
    }
    child [concept color=yellow!30] { node {Thesis Series}
        child { node {Basic Structure}}
        child { node {Page Layout}}
        child { node {Figures, Subfigures and Tables}}
        child { node {Biblatex}}
        child { node {Title Page}}
    }
    child [concept color=teal!40]  { node {Beamer Series}
        child { node {Getting Started}}
        child { node {Text, Pictures and Tables}}
        child { node {Blocks, Code and Hyperlinks}}
        child { node {Overlay Specifications}}
        child { node {Themes and Handouts}}
    }
    child [concept color=purple!50] { node {TikZ Series}
        child { node {Basic Drawing}}
        child { node {Geogebra}}
        child { node {Flow Charts}}
        child { node {Circuit Diagrams}}
        child [concept color=green!40]  { node {Mind Maps}}
    };
\end{tikzpicture}
\end{document}

mind_hyperlinks+mindmap.tex

\documentclass{article}
\usepackage[paperheight=7in,paperwidth=7in, 
					top=0.5in, 
					bottom=0.5in, 
					left=0.5in, 
					right=0.5in]{geometry}
					
\usepackage[hidelinks]{hyperref}
\usepackage{tikz}
\usetikzlibrary{mindmap}

\begin{document}
\pagestyle{empty}

\begin{tikzpicture}
  \path[mindmap,concept color=black,text=white]
    node[concept] {Computer Science}
    [clockwise from=0]
    child[concept color=green!50!black] {
      node[concept] {\hyperlink{pract}{practical}}
      [clockwise from=90]
      child { node[concept] {algorithms} }
      child { node[concept] {data structures} }
      child { node[concept] {pro\-gramming languages} }
      child { node[concept] {software engineer\-ing} }
    }  
    child[concept color=blue] {
      node[concept] {applied}
      [clockwise from=-30]
      child { node[concept] {\hyperlink{datab}{databases}} }
      child { node[concept] {WWW} }
    }
    child[concept color=red] { node[concept] {technical} }
    child[concept color=orange] { node[concept] {theoretical} 
    };
\end{tikzpicture}

%\newpage
\begin{itemize}
  \item \hypertarget{pract}{Practical}: here is some description.
  \item \hypertarget{datab}{Databases}: here is some description.
\end{itemize}
\end{document}

mind_long_text_boxes-fixed+mindmap.tex

% https://tex.stackexchange.com/a/88174/173708
\documentclass[tikz, border=2pt]{standalone}
\usetikzlibrary{mindmap,trees,positioning}
\makeatletter
\tikzset{
    non-concept/.style={
        rectangle,
        text width=12em,
        text=black,
        align=left,
    },
    cncc east/.style={
        edge from parent path={
            (\tikzparentnode.east) to[out=0, in=180] (\tikzchildnode.south west)
            -- (\tikzchildnode.south east)
        }
    }
}
\makeatother
\begin{document}
\pagestyle{empty}
\begin{tikzpicture}
  \path[mindmap, concept color=black, text=white]
    node[concept] {Main Topic}[clockwise from=0]% named \___/ node
    child[concept color=green!50!black] {
        node[concept] (def) {definition}
        [
            grow=right,
            sibling distance=14ex,
        ]
            child[level distance=5cm] 
            	{ node[non-concept] 
            		{What does each person know and not know about my topic?}                            
            	edge from parent[cncc east] }
		child[level distance=5cm] 
			{ node[non-concept] 
				{How will each person react? What concerns will I need to overcome?}                 
			edge from parent[cncc east] }
		child[level distance=5cm] 
			{ node[non-concept] 
				{Who exactly is my audience? What is each listener's role and reason for attending?} 
			edge from parent[cncc east] }
        }
    child[concept color=blue]           { node[concept]       {Subtopic 1} }
    child[concept color=red]            { node[concept]       {Subtopic 2} }
    child[concept color=orange]         { node[concept]       {Subtopic 3} }
    child[concept color=purple]         { node[concept]       {Subtopic 4} }
    child[concept color=brown]          { node[concept]       {Subtopic 5} };
\end{tikzpicture}
\end{document}

mind_optional_argument+mindmap.tex

\documentclass[margin=2mm]{standalone}

\usepackage{tikz}
\usetikzlibrary{mindmap}

\begin{document}
\begin{tikzpicture}[
    mindmap,
    every node/.style=concept,
    concept color=black!20,
    grow cyclic,
    level 1/.append style={level distance=4.5cm,sibling angle=90},
    level 2/.append style={level distance=3cm,sibling angle=45}
    ]
  \node [root concept] {Computational Complexity} % root
    child [concept color=red] { node {Computational Problems}
      child { node {Problem Measures} } 
      child { node {Problem Aspects} }
    }
    child [concept color=blue] { node {Computational Models}
      child { node {Turing Machines} }
      child { node {Random-Access Machines} }
    };
\end{tikzpicture}
\end{document}

mind_scientific_interactions+mindmap.tex

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Author  : Andrei Sobolevski (April 2009)
% License : Creative Commons attribution license
% Title   : Map of scientific interactions of researchers 
%           affiliated in 2008 to the J.-V. Poncelet laboratory 
%           (UMI 2615 CNRS, http://www.poncelet.ru)
% Notes   : Produced for the 2008 annual report of the lab;
%           layout of subnodes is a result of manual optimization
% Tags    : mindmap, layers
% Submitted to TeXample.net on 16 January 2010

\documentclass{article}
\usepackage{tikz,times}
%\usepackage[paperwidth=25cm,paperheight=22cm,left=1cm,top=1cm]{geometry} % prevent print PDF and png in page 1
\usepackage{geometry}
\usetikzlibrary{mindmap,backgrounds}

%\pagestyle{empty}

\begin{document}
\centering\begin{tikzpicture}[mindmap,
  level 1 concept/.append style={level distance=130,sibling angle=30},
  extra concept/.append style={color=blue!50,text=black}]

  % Applied area: computer science and its subfields

  \begin{scope}[mindmap, concept color=orange, text=white]
    \node [concept] {Informatique}[clockwise from=-5] 
      child {node [concept] (log) {M{\'e}thodes cat{\'e}goriques}}
      child {node [concept] (alg) {Algorithmique}}
      child {node [concept] (cod) {Compression \& transmission}}
      child {node [concept] (img) {Tra{\^i}tement des images}}
      child {node [concept] (opt) {Optimisation}}
      child {node [concept] (res) {R{\'e}seaux}};
  \end{scope}

  % Applied area: theoretical physics and its subfields

  \begin{scope}[mindmap, concept color=red,text=white]
    \node [concept] at (-5,-15) {Physique}
      child [grow=-10, level distance=160]
        {node [concept] (qin) {Calcul quantique}}
      child [grow=20] 
        {node [concept] (csm) {Astronomie \& cosmologie}}
      child [grow=110] 
        {node [concept] (mat) {Mati{\`e}re condens{\'e}e}};
  \end{scope}

  % Applied area: biology and its subfields

  \begin{scope}[mindmap, concept color=green!50!black,text=white]
    \node [concept] at (6.5,-15) {Biologie} 
      child [grow=165, level distance=120] 
        {node [concept] (med) {M{\'e}decine}}
      child [grow=60] 
        {node [concept] (gen) {G{\'e}nomique}};
  \end{scope}

  % Applied area: economics (one subfield)

  \begin{scope}[mindmap, concept color=violet, text=white]
    \node [concept] at (11,-14) {{\'E}conomie}
      child [grow=70, level distance=120] 
        {node [concept] (dec) {Choix \& prise de d{\'e}cision}};
  \end{scope}

  % Researchers listed by their main specialization in mathematics

  \begin{scope}[mindmap, concept color=blue]

    % Combinatorics and discrete mathematics 
    \node [concept, text=white] at (5.2,-10.8) 
      {Combinatoire \& math{\'e}matiques discr{\`e}tes} 
      [clockwise from=150]
      child [concept color=blue!50] {node [concept] (ver) {Vereschagin}}
      child [concept color=blue!50, level distance=125] 
        {node [concept] (kab) {Kabatyanski, Tsfasman, Rybakov, Zykin}}
      child [concept color=blue!50] 
        {node [concept] (kch) {Kucherov, Roytberg}}
      child [concept color=blue!50] {node [concept] (raf) {Raffinot}}
      child [concept color=blue!50, level distance=135]
        {node [concept] (ksh) {Koshevoy}};

    % Partial differential equations
    \node [concept, text=white] at (-3,-11) 
      {Equations aux d{\'e}riv{\'e}es partielles 
        \& m{\'e}thodes num{\'e}riques}
      child [concept color=blue!50, grow=0, level distance=140] 
        {node [concept] (lhc) {Loh{\'e}ac}}
      child [concept color=blue!50, grow=60, level distance=115] 
        {node [concept] (otr) {OTARIE (Sobolevski)}}
      child [concept color=blue!50, grow=95] {node [concept] (ndr) 
        {Nadirashvili}};

    % Probability
    \node [concept, text=white] at (-7.2,-3.2) {Probabilit{\'e}s}
      child [concept color=blue!50, grow=-70, level distance=120] 
        {node [concept] (rbk) {Rybko}};

    % Logic
    \node [concept, text=white] at (11.5,-5) {Logique}
      child [concept color=blue!50, grow=165, level distance=120] 
        {node [concept] (sht) {Shehtman}};
  \end{scope}

  % Connections of researchers to applied subfields

  \begin{pgfonlayer}{background}
    \draw [circle connection bar]
      (kab) edge (cod)
      (kch) edge (alg) edge (gen)
      (lhc) edge (med)
      (ksh) edge (dec)
      (ndr) edge (mat)
      (otr) edge (opt) edge (csm) edge (img)
      (raf) edge (alg) edge (gen)
      (rbk) edge (res) edge (mat)
      (sht) edge (log) edge (dec)
      (ver) edge (qin) edge (cod);
  \end{pgfonlayer}
\end{tikzpicture}

\end{document}

mind_shaded+mindmap.tex

% https://tex.stackexchange.com/questions/58249/how-to-shade-mindmap-concepts?rq=1
\documentclass[a4paper,11pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{mindmap}

\tikzset{level 1 concept/.append style={font=\sf, sibling angle=90,level distance = 25mm}}
\tikzset{level 2 concept/.append style={font=\sf, sibling angle=45,level distance = 16mm}}
\tikzset{level 3 concept/.append style={font=\sf, sibling angle=45,level distance = 17mm}}
\tikzset{every node/.append style={scale=0.6}}

\begin{document}

\begin{tikzpicture}
    [
        mindmap, 
        concept color=blue, 
        font=\sf\bf, 
        text=white
    ]
    \node[concept,ball color=blue]{Root Concept}[clockwise from=315]
    child [concept color=violet] {node[circle,ball color=violet] (c1){Child 1}                                
        child  {node [circle,ball color=violet](c11){Child 1-1}}
        child  {node [circle,ball color=violet](c12){Child 1-2}}
        child  {node [circle,ball color=violet](c13){Child 1-3}}                                                   
    }
    child [concept color=orange]{node [circle,ball color=orange](c2){Child 2}
        child {node [circle,ball color=orange](c21){Child 2-1}}
        child {node [circle,ball color=orange](c22){Child 2-2}}
        child {node [circle,ball color=orange](c22){Child 1-3}}
    };
\end{tikzpicture}
\end{document}

mind_specific_distance+mindmap.tex

% https://tex.stackexchange.com/questions/119625/mindmap-level-specific-child-distance?rq=1
\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{mindmap,trees}

\begin{document}
\resizebox{!}{4 in}{%
   \begin{tikzpicture}
      \path[
         mindmap,
         concept color=black,
         text=white,
         grow cyclic,
         segment length=20cm,
   level 1/.append style={level distance=8cm,sibling angle=60},
   level 2/.append style={level distance=2.5cm},
      ]
      node[concept] {Main}
      [clockwise from=0]
      child[concept color=green!50!black] {%
         node[concept] {A}
         [clockwise from=30]
         child {node[concept] {A1} }
         child {node[concept] {A2} }
         child {node[concept] {A3} }
         child {node[concept] {A4} }
         child {node[concept] {A5} }
         child {node[concept] {A6} }
      }  
      child[concept color=blue] {%
         node[concept] {B}
         [clockwise from=30]
         child {node[concept] {B1} }
         child {node[concept] {B2} }
         child {node[concept] {B3} }
         child {node[concept] {B4} }
         child {node[concept] {B5} }
         child {node[concept] {B6} }
      }
      child[concept color=red] {%
         node[concept] {C}
         [clockwise from=30]
         child {node[concept] {C1} }
         child {node[concept] {C2} }
         child {node[concept] {C3} }
         child {node[concept] {C4} }
         child {node[concept] {C5} }
         child {node[concept] {C6} }
      }
      child[concept color=orange] {%
         node[concept] {D}
         [clockwise from=30]
         child {node[concept] {D1} }
         child {node[concept] {D2} }
         child {node[concept] {D3} }
         child {node[concept] {D4} }
         child {node[concept] {D5} }
         child {node[concept] {D6} }
      }
      child[concept color=magenta] {%
         node[concept] {E}
         [clockwise from=30]
         child {node[concept] {E1} }
         child {node[concept] {E2} }
         child {node[concept] {E3} }
         child {node[concept] {E4} }
         child {node[concept] {E5} }
         child {node[concept] {E6} }
      }
      child[concept color=brown] {%
         node[concept] {F}
         [clockwise from=30]
         child {node[concept] {F1} }
         child {node[concept] {F2} }
         child {node[concept] {F3} }
         child {node[concept] {F4} }
         child {node[concept] {F5} }
         child {node[concept] {F6} }
      };
   \end{tikzpicture}
}
\end{document}

mind_thicker_connectors+mindmap.tex

\documentclass[tikz, preview=true, border=2mm]{standalone}

\renewcommand*\familydefault{\sfdefault}

\usepackage{tikz}
\usetikzlibrary{mindmap,trees,shadows}

\begin{document}

\begin{tikzpicture}
    [decoration={start radius=1cm, end radius=.5cm,amplitude=3mm,angle=30}]

    % Define experience colors
    \colorlet{afcolor}{blue!50}
    \colorlet{mdcolor}{red!75}
    \colorlet{nmndcolor}{orange!80}
    \colorlet{nmescolor}{teal!70!green}
    \colorlet{citscolor}{violet!75}

    \begin{scope}[mindmap,
        every node/.style={concept, circular drop shadow, minimum size=0pt,execute at begin node=\hskip0pt, font=\bfseries},
        root concept/.append style={
        concept color=black, fill=white, line width=1.5ex, text=black, font=\huge\scshape\bfseries,},
        level 1 concept/.append style={font=\bfseries},
        text=white,
        partner/.style={concept color=blue!80!black},
        air force/.style={concept color=afcolor},
        metadata/.style={concept color=mdcolor},
        nmnd/.style={concept color=nmndcolor},
        nmes/.style={concept color=nmescolor},
        cits/.style={concept color=citscolor},
        grow cyclic,
        level 1/.append style={level distance=6.2cm,sibling angle=45},
        level 2/.append style={level distance=3cm,sibling angle=45}]
        \node [root concept] (team) {Team\\Foo}[rotate=202.5] % root
        child [partner] { node {Comp 8}
            child [nmes] { node {\small NM/ES} }
        }
        child [partner] { node {Comp 1}
            child [metadata] { node {\small Metadata} }
            child [air force] { node {\small Air Force} }
            child [nmnd] { node {\small NM/ND} }
            child [cits] { node {\small CITS} }
            child [nmes] { node {\small NM/ES} }
        }
        child [partner] { node {Comp 2}
            child [metadata] { node {\small Metadata} }
        }
        child [partner] { node (comp3) {Comp 3}
            child [air force] { node {\small Air Force} }
            child [nmnd] { node {\small NM/ND} }
            child [cits] { node (leftmost) {\small CITS} }
            child [nmes] { node {\small NM/ES} }
        }
        child [partner] { node {Comp 4}
            child [air force] { node {\small Air Force} }
            child [nmes] { node {\small NM/ES} }
        }
        child [partner] { node {Comp 5}
            child [metadata] { node {\small Metadata} }
            child [nmnd] { node {\small NM/ND} }
            child [nmes] { node {\small NM/ES} }
        }
        child [partner] { node {Comp 6}
            child [air force] { node {\small Air Force} }
            child [nmnd] { node {\small NM/ND} }
            child [nmes] { node {\small NM/ES} }
        }
        child [partner] { node {Comp 7}
            child [air force] { node {\small Air Force} }
            child [nmnd] { node {\small NM/ND} }
            child [nmes] { node {\small NM/ES} }
        };
    \end{scope}

    \begin{scope}[xshift=-4.5cm, yshift=-10.5cm,every node/.style={align=left,text=black}]
        \matrix[row sep=0pt,column sep=1mm, align=left, nodes={align=left, anchor=west}] {
        \fill [afcolor] (0,.25ex) circle (1ex); & \node{Air Force Experience};\\
        \fill [mdcolor] (0,.25ex) circle (1ex); & \node{Metadata Environments Development Experience};\\
        \fill [nmndcolor] (0,.25ex) circle (1ex); & \node{Network Management and Network Defense Experience};\\
        \fill [nmescolor] (0,.25ex) circle (1ex); & \node{Network Management and Enterprise Services Experience};\\
        \fill [citscolor] (0,.25ex) circle (1ex); & \node{CITS Information Transport Systems Experience};\\
        };
    \end{scope}
\end{tikzpicture}

\end{document}

mind_tutorials_videos+mindmap.tex

\documentclass[tikz,border=10pt]{standalone}
%\documentclass[crop, tikz]{standalone}

\usepackage{tikz}

\begin{document}
	
%https://www.overleaf.com/learn/latex/LaTeX_Graphics_using_TikZ:_A_Tutorial_for_Beginners_(Part_5)%E2%80%94Creating_Mind_Maps
\usetikzlibrary{mindmap}
\begin{tikzpicture}
	[
		mindmap, 
		grow cyclic, 
		every node/.style=concept, 
		concept color=orange!40, 
		level 1/.append style={level distance=5cm,sibling angle=90},
		level 2/.append style={level distance=3cm,sibling angle=45},
	]
	
	\node{ShareLaTeX Tutorial Videos}
	child [concept color=blue!30] { node {Beginners Series}
		child { node {First Document}}
		child { node {Sections and Paragraphs}}
		child { node {Mathematics}}
		child { node {Images}}
		child { node {bibliography}}
		child { node {Tables and Matrices}}
		child { node {Longer Documents}}
	}
	child [concept color=yellow!30] { node {Thesis Series}
		child { node {Basic Structure}}
		child { node {Page Layout}}
		child { node {Figures, Subfigures and Tables}}
		child { node {Biblatex}}
		child { node {Title Page}}
	}
	child [concept color=teal!40] { node {Beamer Series}
		child { node {Getting Started}}
		child { node {Text, Pictures and Tables}}
		child { node {Blocks, Code and Hyperlinks}}
		child { node {Overlay Specifications}}
		child { node {Themes and Handouts}}
	}
	child [concept color=purple!50]{ node {TikZ Series}
		child { node {Basic Drawing}}
		child { node {Geogebra}}
		child { node {Flow Charts}}
		child { node {Circuit Diagrams}}
		child [concept color=green!40] { node {Mind Maps}}
	};
\end{tikzpicture}
	
\end{document}

mind_two_connected_roots+mindmap.tex

% https://tex.stackexchange.com/questions/144826/how-do-i-create-a-tikz-mindmap-that-has-two-connected-roots
\documentclass[landscape]{standalone}
\usepackage{tikz}
\usetikzlibrary{mindmap}

\pagestyle{empty}
\begin{document}

\begin{tikzpicture}[small mindmap, outer sep=0pt, text=black]

  \begin{scope}[concept color=brown!30]
    \node (right) at (2,0) [concept] {Right}
      [clockwise from=70]
      child { node[concept] {R.1} }
      child { node[concept] {R.2} }
    ;
  \end{scope}

  \begin{scope}[concept color=green!40!black!30]
    \node (left) at (-2,0) [concept] {Left}
      [counterclockwise from=210]
      child { node[concept] {L.1}  }
      child { node[concept] {L.2} }
    ;
  \end{scope}
  \path (left) to[circle connection bar switch color=from (green!40!black!30) to (brown!30)] (right) ;

\end{tikzpicture}
\end{document}

ml_evolutionary+scope.tex

% https://gist.github.com/MatteoRagni/3920cd55d4ef29e4aff19a8ece3f225a
\documentclass[]{standalone}

\usepackage{tikz}

\begin{document}
  
  
  \tikzstyle{scale all}=[every node/.style={scale=#1}, scale=#1]
  \tikzset{
    solution/.pic = {
      \begin{scope}
        \draw (0, 0) rectangle ++(1, 1);
        \draw (0, 1) rectangle ++(1, 1);
        \draw (0, 2) rectangle ++(1, 1);
        \draw (0, 3) rectangle ++(1, 1);
        \node[anchor=center] at (0.5, 0.5) {$m_{123}$};
        \node[anchor=center] at (0.5, 1.5) {$\ldots$};
        \node[anchor=center] at (0.5, 2.5) {$\ldots$};
        \node[anchor=center] at (0.5, 3.5) {$m_1$};
      \end{scope};
    },
    population with number/.pic = {
      \begin{scope}
        \draw (0, 0) pic {solution} node at (0.5,-0.75) {1};
        \draw (1.5, 0) pic {solution} node at (2,-0.75) {2};
        \draw (4.5, 0) pic {solution} node at (5,-0.75) {123};
        \draw (3, 2) circle (0.1);
        \draw (3.5, 2) circle (0.1);
        \draw (4, 2) circle (0.1);
        \draw (0.3, 4.3) -- (-0.3, 4.3) -- (-0.3, -0.3) -- (0.3, -0.3);
        \draw (5.2, 4.3) -- (5.8, 4.3) -- (5.8, -0.3) -- (5.2, -0.3);
      \end{scope}
    },
    population/.pic = {
      \begin{scope}
        \draw (0, 0) pic {solution};
        \draw (1.5, 0) pic {solution};
        \draw (4.5, 0) pic {solution};
        \draw (3, 2) circle (0.1);
        \draw (3.5, 2) circle (0.1);
        \draw (4, 2) circle (0.1);
        \draw (0.3, 4.3) -- (-0.3, 4.3) -- (-0.3, -0.3) -- (0.3, -0.3); % left square bracket
        \draw (5.2, 4.3) -- (5.8, 4.3) -- (5.8, -0.3) -- (5.2, -0.3); % right square bracket
      \end{scope}
    },
    population expanded/.pic = {
      \begin{scope}
        \draw (0, 0) pic {solution};
        \draw (1.5, 0) pic {solution};
        \draw[#1] (4.5, 0) pic {solution};
        \draw (7.5, 0) pic {solution};
        
        \draw (3, 2) circle (0.1);
        \draw (3.5, 2) circle (0.1);
        \draw (4, 2) circle (0.1);
        
        \draw (6, 2) circle (0.1);
        \draw (6.5, 2) circle (0.1);
        \draw (7, 2) circle (0.1);
        
        \draw (0.3, 4.3) -- (-0.3, 4.3) -- (-0.3, -0.3) -- (0.3, -0.3);
        \draw (8.2, 4.3) -- (8.8, 4.3) -- (8.8, -0.3) -- (8.2, -0.3);
      \end{scope}
    },
    population sorted/.pic = {
      \begin{scope}
        \draw (0, 0) pic {solution} node at (0.5,-0.75) {1};
        \draw (1.5, 0) pic {solution} node at (2,-0.75) {2};
        \draw (4.5, 0) pic {solution} node at (5,-0.75) {123};
        \draw[red] (6, 0) pic {solution} node at (6.5,-0.75) {124};
        \draw[red] (9, 0) pic {solution} node at (9.5,-0.75) {123+n};
        
        \draw (3, 2) circle (0.1);
        \draw (3.5, 2) circle (0.1);
        \draw (4, 2) circle (0.1);
        
        \draw[red] (7.5, 2) circle (0.1);
        \draw[red] (8, 2) circle (0.1);
        \draw[red] (8.5, 2) circle (0.1);
        
        \draw (0.3, 4.3) -- (-0.3, 4.3) -- (-0.3, -0.3) -- (0.3, -0.3);
        \draw (10.2, 4.3) -- (10.8, 4.3) -- (10.8, -0.3) -- (10.2, -0.3);
      \end{scope}
    },
    initial population/.pic = {
      % Initial population drawing
      \draw (0, -0.3) node {$\mathbf{P} = $};
      \draw (0.75, -1) pic [scale all=0.35] {population with number};
    },
    augmenting population ten percent/.pic = {
      % Increasing population by ten percent
      \draw[<-] (2, 1.5) -- ++(0, 1) node [pos=0.5, anchor=west, blue] {$\mathbf{P} + 10\% $};
      \draw (0, 0.425) node {$\mathbf{P} = $};
      \draw (0.75, -0.3) pic [scale all=0.35] {population expanded={blue}};
    },
    pics/gene mutation/.style args ={#1,#2}{
      code={
        % Mutate a gene with a mutation Mx
        \begin{scope}
          \draw (0, 0) rectangle ++(1, 1);
          \draw (0, 1) rectangle ++(1, 1);
          \draw[fill={#1}] (0, 2) rectangle ++(1, 1);
          \draw (0, 3) rectangle ++(1, 1);
          \draw (0, 4) rectangle ++(1, 1);
          \node[anchor=center] at (0.5, 0.5) {$m_{123}$};
          \node[anchor=center] at (0.5, 1.5) {$\ldots$};
          \node[anchor=center] at (0.5, 2.5) {{#2}};
          \node[anchor=center] at (0.5, 3.5) {$\ldots$};
          \node[anchor=center] at (0.5, 4.5) {$m_1$};
        \end{scope};
      }
    },
    mutate a gene/.pic = {
      \draw[->] (-1, 3.725) -- ++(0, -1.25) -- ++(0.75, 0) node [pos=0.25, scale=0.75, anchor=north, yshift=-2] {cloning};
      \draw (0, 1.575) pic [scale all=0.35] {gene mutation={yellow,$m_k$}};
      \draw[->] (0.75, 2.5) -- ++(1, 0) node [yshift=-2, scale=0.75, pos=0.5, anchor=north] {$\textbf{Mx}(m_k)$};
      \draw[fill=green] (2, 2.325) rectangle ++(0.35, 0.35);
      \node[anchor=center, scale=0.35] at (2.175, 2.495) {$m_{k}'$};
      \draw[->] (2.75, 2.5) -- ++(1, 0) node[pos=0.5, yshift=-2, scale=0.75, anchor=north] {mutation};
      \draw (4, 1.575) pic [scale all=0.35] {gene mutation={green, $m_k'$}};
      \draw[->] (4.175, 3.5) -- ++(0, 1.2) -- ++(-3.5, 0) node[pos=0.5, scale=0.75, anchor=north] {insertion};
    },
    pics/cluster population/.style args = {#1}{
      code = {
        \draw (0, 0) pic [scale all=0.35] {population};
        \draw (0.85, 2) node {{#1}};
      }
    },
    clusters populations/.pic = {
      \draw (0, 0) pic {cluster population={$\mathbf{P}_{G(s) = 0}$}};
      \draw[dashed] (2.225, -0.5) -- ++(0, 2.5) node [pos=0, anchor=north] {$ < 123$};
      \draw (2.5, 0) pic {cluster population={$\mathbf{P}_{G(s) = 1}$}};
      \draw[dashed] (4.725, -0.5) -- ++(0, 2.5) node [pos=0, anchor=north] {$ < 123$};
      \draw (5, 0) pic {cluster population={$\mathbf{P}_{G(s) = 2}$}};
      \draw (7.225, -0.5) -- ++(0, 2.5) node [pos=0, anchor=north] {$\geq 123$};
      \draw (7.5, 0) pic[red] {cluster population={$\mathbf{P}_{G(s) = 3}$}};
      \draw[red] (9.725, -0.5) -- ++(0, 2.5) node [pos=0, anchor=north] {$> 123$};
      
      \draw (-0.25, -1) -- (-0.25, -1.3) -- (7.225, -1.3) -- (7.225, -1);
    },
    sorting cost/.pic = {
      \draw (0, 0) pic[scale all=0.35] {population sorted};
      \draw (0, -0.5) node [anchor=center, scale=0.75] {$\min\,C(s)$};
      \draw (3.8, -0.5) node [anchor=center, scale=0.75] {$\max\,C(s)$};
    }
  }
  
  
  \begin{tikzpicture}
    \draw (0, 0) pic {initial population};
    \draw (0, -4) pic {augmenting population ten percent};    
    \draw (3.5, -8.25) pic {mutate a gene};
    \draw[<-] (2, -8) -- ++(0, 1) node [pos=0.5, anchor=west, blue] {$\mathbf{P} + 50\% $};
    \draw (0, -10.5) pic {clusters populations};
    \draw[<-] (2, -12.80) -- ++(0, 1) node [pos=0.5, anchor=west, blue] {Gap-based selection};
    \draw (0, -14.5) pic {sorting cost};
    \draw[->] (2, -15.3) -- ++(0, -1) node [pos=0.5, anchor=west, blue] {Cost-based selection}
      -- ++(-3, 0) -- (-1, -0.25) -- ++(0.5, 0);
    %\draw (0, -17) pic {initial population};
    
    % Indication lateral
    \draw (10, 1) -- ++(0.5, 0) -- node [rotate=90, pos=0.5, anchor=north] {(1) Random augmentation} ++(0, -3.5) -- ++(-0.5, 0);
    \draw (10, -2.7) -- ++(0.5, 0) -- node [rotate=90, pos=0.5, anchor=north] {(2) Cloning and Mutate} ++(0, -5.25) -- ++(-0.5, 0);
    \draw (10, -8.1) -- ++(0.5, 0) -- node [rotate=90, pos=0.5, anchor=north] {(3) Gap Sorting/Selection} ++(0, -4.5) -- ++(-0.5, 0);
    \draw (10, -12.8) -- ++(0.5, 0) -- node [rotate=90, pos=0.5, anchor=north] {(4) Cost Sorting/Selection} ++(0, -3.5) -- ++(-0.5, 0);
  \end{tikzpicture}
  
\end{document}

ml_feature_selection.tex

\documentclass[margin=3pt]{standalone}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{arrows,shadows,positioning}

\tikzset{
  frame/.style={
    rectangle, draw, 
    text width=6em, text centered,
    minimum height=4em,drop shadow,fill=yellow!40,
    rounded corners,
  },
  line/.style={
    draw, -latex',rounded corners=3mm,
  }
}

\begin{document}
\begin{tikzpicture}[font=\small\sffamily\bfseries,very thick,node distance = 4cm]
\node [frame] (pop) {Population};
\node [above=2cm, text width=2cm, align=center, left of=pop] (init) {Random \\ Initialisation};
\node [below=2cm, text width = 2cm, align = center, left of=pop] (term) {Termination};
\node [frame, above=2cm, right of=pop] (parents)  {Parents};
\node [frame, below=2cm, right of=pop] (off)  {Offspring};

% termination condition label
\node [draw=none, text width=3cm, above right = -0.1cm and -1cm of term ] () {(unique features \\ less than $\frac{1}{3}$ of \\ maximum features)};
\path [line] (parents)
 -- node[right,align=left,pos=.5] {Crossover\\[3mm]Inversion\\[3mm]Mutation}
 (off);
\path [line] (init) |- (pop.170);
\path [line] (pop.190) -| (term);
\path [line] (off) -| node[below,pos=.25, align=center] {Survivor\\ selection}(pop);
\path [line] (pop) |- node[above,pos=.75, align=center] {Parents\\ selection}(parents);
\end{tikzpicture}
\end{document}

ml-cnn.tex

% https://davidstutz.de/illustrating-convolutional-neural-networks-in-latex-with-tikz/

\documentclass{standalone}
 
\usepackage[utf8]{inputenc}
\usepackage{amsmath, amssymb, latexsym}
 
%\usepackage[left=2cm,right=2cm,top=2cm,bottom=2cm]{geometry}
\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}
\usetikzlibrary{fadings}
 
\begin{document}
 

\begin{tikzpicture}
   		\node at (0.5,-1){\begin{tabular}{c}input image\\layer $l = 0$\end{tabular}};

\draw (0,0) -- (1,0) -- (1,1) -- (0,1) -- (0,0);

\node at (3,3.5){\begin{tabular}{c}convolutional layer\\with non-linearities\\layer $l = 1$\end{tabular}};

\draw[fill=black,opacity=0.2,draw=black] (2.75,1.25) -- (3.75,1.25) -- (3.75,2.25) -- (2.75,2.25) -- (2.75,1.25);
\draw[fill=black,opacity=0.2,draw=black] (2.5,1) -- (3.5,1) -- (3.5,2) -- (2.5,2) -- (2.5,1);
\draw[fill=black,opacity=0.2,draw=black] (2.25,0.75) -- (3.25,0.75) -- (3.25,1.75) -- (2.25,1.75) -- (2.25,0.75);
\draw[fill=black,opacity=0.2,draw=black] (2,0.5) -- (3,0.5) -- (3,1.5) -- (2,1.5) -- (2,0.5);
\draw[fill=black,opacity=0.2,draw=black] (1.75,0.25) -- (2.75,0.25) -- (2.75,1.25) -- (1.75,1.25) -- (1.75,0.25);
\draw[fill=black,opacity=0.2,draw=black] (1.5,0) -- (2.5,0) -- (2.5,1) -- (1.5,1) -- (1.5,0);

\node at (4.5,-1){\begin{tabular}{c}subsampling layer\\layer $l = 3$\end{tabular}};

\draw[fill=black,opacity=0.2,draw=black] (5,1.25) -- (5.75,1.25) -- (5.75,2) -- (5,2) -- (5,1.25);
\draw[fill=black,opacity=0.2,draw=black] (4.75,1) -- (5.5,1) -- (5.5,1.75) -- (4.75,1.75) -- (4.75,1);
\draw[fill=black,opacity=0.2,draw=black] (4.5,0.75) -- (5.25,0.75) -- (5.25,1.5) -- (4.5,1.5) -- (4.5,0.75);
\draw[fill=black,opacity=0.2,draw=black] (4.25,0.5) -- (5,0.5) -- (5,1.25) -- (4.25,1.25) -- (4.25,0.5);
\draw[fill=black,opacity=0.2,draw=black] (4,0.25) -- (4.75,0.25) -- (4.75,1) -- (4,1) -- (4,0.25);
\draw[fill=black,opacity=0.2,draw=black] (3.75,0) -- (4.5,0) -- (4.5,0.75) -- (3.75,0.75) -- (3.75,0);

\node at (7,3.5){\begin{tabular}{c}convolutional layer\\with non-linearities\\layer $l = 4$\end{tabular}};

\draw[fill=black,opacity=0.2,draw=black] (7.5,1.75) -- (8.25,1.75) -- (8.25,2.5) -- (7.5,2.5) -- (7.5,1.75);
\draw[fill=black,opacity=0.2,draw=black] (7.25,1.5) -- (8,1.5) -- (8,2.25) -- (7.25,2.25) -- (7.25,1.5);
\draw[fill=black,opacity=0.2,draw=black] (7,1.25) -- (7.75,1.25) -- (7.75,2) -- (7,2) -- (7,1.25);
\draw[fill=black,opacity=0.2,draw=black] (6.75,1) -- (7.5,1) -- (7.5,1.75) -- (6.75,1.75) -- (6.75,1);
\draw[fill=black,opacity=0.2,draw=black] (6.5,0.75) -- (7.25,0.75) -- (7.25,1.5) -- (6.5,1.5) -- (6.5,0.75);
\draw[fill=black,opacity=0.2,draw=black] (6.25,0.5) -- (7,0.5) -- (7,1.25) -- (6.25,1.25) -- (6.25,0.5);
\draw[fill=black,opacity=0.2,draw=black] (6,0.25) -- (6.75,0.25) -- (6.75,1) -- (6,1) -- (6,0.25);
\draw[fill=black,opacity=0.2,draw=black] (5.75,0) -- (6.5,0) -- (6.5,0.75) -- (5.75,0.75) -- (5.75,0);

\node at (9.5,-1){\begin{tabular}{c}subsampling layer\\layer $l = 6$\end{tabular}};

\draw[fill=black,opacity=0.2,draw=black] (10,1.75) -- (10.5,1.75) -- (10.5,2.25) -- (10,2.25) -- (10,1.75);
\draw[fill=black,opacity=0.2,draw=black] (9.75,1.5) -- (10.25,1.5) -- (10.25,2) -- (9.75,2) -- (9.75,1.5);
\draw[fill=black,opacity=0.2,draw=black] (9.5,1.25) -- (10,1.25) -- (10,1.75) -- (9.5,1.75) -- (9.5,1.25);
\draw[fill=black,opacity=0.2,draw=black] (9.25,1) -- (9.75,1) -- (9.75,1.5) -- (9.25,1.5) -- (9.25,1);
\draw[fill=black,opacity=0.2,draw=black] (9,0.75) -- (9.5,0.75) -- (9.5,1.25) -- (9,1.25) -- (9,0.75);
\draw[fill=black,opacity=0.2,draw=black] (8.75,0.5) -- (9.25,0.5) -- (9.25,1) -- (8.75,1) -- (8.75,0.5);
\draw[fill=black,opacity=0.2,draw=black] (8.5,0.25) -- (9,0.25) -- (9,0.75) -- (8.5,0.75) -- (8.5,0.25);
\draw[fill=black,opacity=0.2,draw=black] (8.25,0) -- (8.75,0) -- (8.75,0.5) -- (8.25,0.5) -- (8.25,0);

\node at (12,3.5){\begin{tabular}{c}fully connected layer\\layer $l = 7$\end{tabular}};

\draw[fill=black,draw=black,opacity=0.5] (10.5,0) -- (11,0) -- (12.5,1.75) -- (12,1.75) -- (10.5,0);

\node at (13,-1){\begin{tabular}{c}fully connected layer\\output layer $l = 8$\end{tabular}};

\draw[fill=black,draw=black,opacity=0.5] (12.5,0.5) -- (13,0.5) -- (13.65,1.25) -- (13.15,1.25) -- (12.5,0.5);       
\end{tikzpicture}
\end{document}

ml-single_cnn.tex

% https://davidstutz.de/illustrating-convolutional-neural-networks-in-latex-with-tikz/
%\documentclass[twoside,11pt,a4paper]{standalone}
\documentclass{standalone}
 
\usepackage[utf8]{inputenc}
\usepackage{amsmath, amssymb, latexsym}
\usepackage{sidecap}
 
\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}
 
\begin{document}
 

\begin{tikzpicture}
	\node at (1.5,4){\begin{tabular}{c}input image\\or input feature map\end{tabular}};

	\draw (0,0) -- (3,0) -- (3,3) -- (0,3) -- (0,0);
	
	\draw (2,2) -- (2.5,2) -- (2.5,2.5) -- (2,2.5) -- (2,2);
	\draw (2,0.5) -- (2.5,0.5) -- (2.5,1) -- (2,1) -- (2,0.5);
	\draw (1,1) -- (1.5,1) -- (1.5,1.5) -- (1,1.5) -- (1,1);
	
	\draw (2.5,2) -- (7,3.25);
	\draw (2.5,2.5) -- (7,3.25);

	\draw (2.5,1) -- (5.75,0.25);
	\draw (2.5,0.5) -- (5.75,0.25);
	
	\draw (1.5,1.5) -- (5.5,1.25);
	\draw (1.5,1) -- (5.5,1.25);
	
	\node at (5.75,4){\begin{tabular}{c}output feature maps\end{tabular}};
	
	\draw[fill=black,opacity=0.2,draw=black] (5.5,1.5) -- (7.5,1.5) -- (7.5,3.5) -- (5.5,3.5) -- (5.5,1.5);
	\draw[fill=black,opacity=0.2,draw=black] (5,1) -- (7,1) -- (7,3) -- (5,3) -- (5,1);
	\draw[fill=black,opacity=0.2,draw=black] (4.5,0.5) -- (6.5,0.5) -- (6.5,2.5) -- (4.5,2.5) -- (4.5,0.5);
	\draw[fill=black,opacity=0.2,draw=black] (4,0) -- (6,0) -- (6,2) -- (4,2) -- (4,0);
\end{tikzpicture}

\end{document}

multiline-flowchart.tex

% https://tex.stackexchange.com/questions/149602/drawing-flow-diagram-in-latex-using-tikz
\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{arrows,positioning,shapes.geometric}

\begin{document}
\begin{tikzpicture}[>=latex']
    \tikzset{block/.style= {draw, rectangle, align=center,minimum width=2cm,minimum height=1cm},
    rblock/.style={draw, shape=rectangle,rounded corners=1.5em,align=center,minimum width=2cm,minimum height=1cm},
    input/.style={ % requires library shapes.geometric
    draw,
    trapezium,
    trapezium left angle=60,
    trapezium right angle=120,
    minimum width=2cm,
    align=center,
    minimum height=1cm
    },
    }
    \node [rblock]  (start) {Start};
    \node [block, right =2cm of start] (acquire) {Acquire Image};
    \node [block, right =2cm of acquire] (rgb2gray) {RGB to Gray};
    \node [block, right =2cm of rgb2gray] (otsu) {Localized OTSU \\ Thresholding};
    \node [block, below right =2cm and -0.5cm of start] (gchannel) {Subtract the \\ Green Channel};
    \node [block, right =2cm of gchannel] (closing) {Morphological \\ Closing};
    \node [block, right =2cm of closing] (NN) {Sign Detection \\ Using NN};
    \node [input, right =2cm of NN] (limit) {Speed \\ Limit};
    \node [coordinate, below right =1cm and 1cm of otsu] (right) {};  %% Coordinate on right and middle
    \node [coordinate,above left =1cm and 1cm of gchannel] (left) {};  %% Coordinate on left and middle

    %% paths
    \path[draw,->] (start) edge (acquire)
                (acquire) edge (rgb2gray)
                (rgb2gray) edge (otsu)
                (otsu.east) -| (right) -- (left) |- (gchannel)
                (gchannel) edge (closing)
                (closing) edge (NN)
                (NN) edge (limit)
                ;
\end{tikzpicture}
\end{document}

multiple_block_connections-101+diagram.tex

% https://tex.stackexchange.com/a/37310/173708
\documentclass[12pt,a4paper]{article}
%\documentclass[border=2pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc}

%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>

\begin{document}

\begin{figure}
  \begin{center}
  \begin{tikzpicture}[>=stealth]
    %coordinates
    \coordinate (orig)   at (0,0);
    \coordinate (LLD)    at (4,0);
    \coordinate (AroneA) at (-1/2,11/2);
    \coordinate (ArtwoA) at (-1/2,5);
    \coordinate (ArthrA) at (-1/2,9/2);
    \coordinate (LLA)    at (1,4);
    \coordinate (LLB)    at (4,4);
    \coordinate (LLC)    at (7,4);
    \coordinate (AroneC) at (25/2,11/2);
    \coordinate (ArtwoC) at (25/2,5);
    \coordinate (ArthrC) at (25/2,9/2);
    \coordinate (conCBD) at (21/2,9/2);
    \coordinate (conCB)  at (21/2,7/2);
    \coordinate (coCBD)  at (11,5);
    \coordinate (coCB)   at (11,3);
    \coordinate (conCBA) at (23/2,11/2);
    \coordinate (conCA)  at (23/2,5/2);

    %nodes
    \node[draw, minimum width=2cm, minimum height=2cm, anchor=south west, text width=2cm, align=center] (A) at (LLA) {Impedance\\control};
    \node[draw, minimum width=2cm, minimum height=2cm, anchor=south west, text width=2cm, align=center] (B) at (LLB) {Inverse\\Dynamics};
    \node[draw, minimum width=3cm, minimum height=2cm, anchor=south west, text width=2cm, align=center] (C) at (LLC) {Manipulator\\and\\environment};
    \node[draw, minimum width=2cm, minimum height=2cm, anchor=south west, text width=2cm, align=center] (D) at (LLD) {Direct\\kinematics};

    %edges
    \draw[->] (AroneA) -- node[above]{$p_d, R_d$} ($(A.180) + (0,1/2)$);
    \draw[->] (ArtwoA) -- node[above]{$v_d$} (A.180);
    \draw[->] (ArthrA) -- node[above]{$v_d$} ($(A.180) + (0,-1/2)$);

    \draw[->] (A.0) -- node[above] {$\alpha$} (B.180);
    \draw[->] (B.0) -- node[above] {$\tau$} (C.180);

    \draw[->] ($(C.0) + (0,1/2)$) -- node[above, pos=0.2]{$h_e$} (AroneC);
    \draw[->] (C.0) -- node[above, pos=0.2]{$q$} (ArtwoC);
    \draw[->] ($(C.0) + (0,-1/2)$) -- node[above, pos=0.2]{$q$} (ArthrC);

    \path[fill] (conCBD) circle[radius=1pt] (conCB) circle[radius=1pt];
    \path[draw,->] (conCBD) -- (conCB) -| ($(B.270) + (1/2,0)$);

    \path[fill] (coCBD) circle[radius=1pt] (coCB) circle[radius=1pt];
    \path[draw,->] (coCBD)  -- (coCB) -| (B.270);

    \path[fill] (conCBA) circle[radius=1pt] (conCA) circle[radius=1pt];
    \path[draw,->] (conCBA) -- (conCA) -| ($(B.270) + (-1/2,0)$);

    \path[draw,->] (conCB) |- ($(D.0) + (0,1/2)$);
    \path[draw,->] (coCB)  |- ($(D.0) + (0,-1/2)$);

    \path[draw,->] (conCA) |- ($(A.270) + (-1/2,0) + (0,-9/2)$) -- ($(A.270) + (-1/2,0)$);

    \path[draw,->] ($(D.180) + (0,1/2)$)  -| node[above,pos=0.2] {$p_e,r_e$} ($(A.270) + (1/2,0)$);
    \path[draw,->] ($(D.180) + (0,-1/2)$) -| node[above,pos=0.15] {$v_e$} (A.270);

  \end{tikzpicture}

  \end{center}

\end{figure}
\end{document}

multiple_blocks_interconnection+diagram.tex

% https://tex.stackexchange.com/questions/215207/looking-to-draw-this-block-diagram-in-tikz
\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning,fit,calc}

\colorlet{mygreen}{green!80!black}
\colorlet{myblue}{blue!80!black}
\colorlet{myred}{red!80!black}

\begin{document}

\begin{tikzpicture}
  [
    std/.style={
    draw,
    text width=2.5cm,
    align=center,
    font=\strut\sffamily
    },
  rnd/.style={
    draw=#1,
    rounded corners=8pt,
    line width=1pt,
    align=center,
    text width=3cm,
    minimum height=2cm,
    font=\strut\sffamily
    },
  vac/.style={
    text width=2.5cm,
    align=center,
    font=\strut\sffamily
    },
  ar/.style={
    ->,
    >=latex
    },
  node distance=0.5cm and 3cm    
  ]
  %The nodes for the left
  \node[std] (va)
    {Vehicle Age};
  \node[std,below=of va] (fs)
    {Fan Strength};
  \node[std,below=of fs] (vs)
    {Vehicle Speed};
  \node[std,below=of vs] (cv)
    {Cabin Volume};
  \node[std,below= 1cm of cv] (fr)
    {Fraction of Recirculation};
  \node[std,below=of fr] (ac)
    {Ambient $CO_{2}$ Concentration};
  \node[std,below=of ac] (op)
    {Occupant Parameters};

  %The nodes for the center
  \node[rnd,right=of va,yshift=-12.5pt] (aer)
    {Air Exchange Rate Determination};
  \node[rnd=myblue,below=of aer] (cdm)
    {Carbon Dioxide Built-in Module};
  \node[rnd=myred,below=of cdm] (vcm)
    {Vehicle Cabin Module};
  \node[rnd=mygreen,below=of vcm] (hvac)
    {\textsc{hvac} Module};

  %The nodes for the right
  \node[vac,right=1cm of cdm] (occ)
    {Output $CO_{2}$ Concentration};
  \node[vac,right=1cm of vcm] (the)
    {Thermal Environment};
  \node[vac,right=1cm of hvac] (col)
    {Compressor Load};

  %The dashed fitting node
  \node[draw,dashed,inner sep=8pt,fit={(va) (cv)}]
    (fit) {};

  % Some auxiliary coordinates for the arrows
  \coordinate (aux1) at ( $ (va.east|-aer.west)!0.25!(aer.west) $ );
  \coordinate (aux2) at ( $ (va.east|-aer.west)!0.50!(aer.west) $ );
  \coordinate (aux3) at ( $ (va.east|-aer.west)!0.75!(aer.west) $ );

  %The arrows from left to center
  \draw[dashed,ar]
    (fit.east|-aer) -- (aer);  
  \foreach \Nodo in {fs,vs,cv}
  {
    \draw[ar,myred]
      ([yshift=5pt]\Nodo.east) -- ([yshift=5pt]aux3|-\Nodo.east) |- (vcm);  
  }
  \foreach \Nodo in {fs,vs,fr}
  {
    \draw[ar,mygreen]
      ([yshift=-5pt]\Nodo.east) -- ([yshift=-5pt]aux2|-\Nodo.east) |- (hvac);  
  }
  \foreach \Nodo in {op,ac}
  {
    \draw[ar,myblue]
      (\Nodo.east) -- (aux1|-\Nodo.east) |- (cdm);  
  }
  \draw[ar,myblue]
    ([yshift=5pt]fr.east) -- ([yshift=5pt]aux1|-fr.east) |- (cdm);  
  \draw[myblue]
    ([yshift=-5pt]cv.east) -- ([yshift=-5pt]aux1|-cv.east);  

  %The arrows from center to right
  \foreach \Ori/\Dest in {cdm/occ,vcm/the,hvac/col}
  {
    \draw[ar]
      (\Ori.east|-\Dest) -- (\Dest);  
  }
\end{tikzpicture}

\end{document}

nested+diagram.tex

% https://tex.stackexchange.com/questions/452323/tikz-nested-block-diagram-with-boxed-text-inside-other-blocks
\documentclass[border=3.14mm,tikz]{standalone}
\usepackage{tikz}

\usetikzlibrary{calc}
\usetikzlibrary{shapes.arrows}
\usetikzlibrary{positioning,fit,backgrounds}

\begin{document}
\begin{tikzpicture}
    [
        mynode/.style = {rectangle, draw, align=center,
        text width=4cm,fill=white,
        inner xsep=6mm, inner ysep=3mm, rounded corners},
        my arrow/.style={single arrow, draw,minimum height=1.1cm},
        rotate border/.style={shape border uses incircle, shape border rotate=#1},
        font=\sffamily
    ]
    
    \node[mynode, label={[name=lab]Camera \& Infrared Sensor}] (inner1) {Time Synchronization};
    \node[mynode, below=2mm of inner1] (justbelow1) {Resampling};
    %
    \node[right=1.5cm of inner1, mynode, label={[name=cal]Calibration \& alignment}] (inner2) {};
    \node[mynode, below=2mm of inner2] (justbelow2) {};
    \node[mynode, below=2mm of justbelow2] (justbelow2b) {};
    \node[mynode, below=2mm of justbelow2b] (justbelow2c) {};
    %
    \node[right=1.5cm of inner2, mynode, label={[name=img]Create obfuscated
    images}] (inner3) {};
    \node[mynode, below=2mm of inner3] (justbelow3) {};
    \node[mynode, below=2mm of justbelow3] (justbelow3b) {};
    \node[mynode, below=2mm of justbelow3b] (justbelow3c) {};
    %
    \node[right=1.5cm of inner3, mynode, label={[name=tech]Obfuscation
    techniques}] (inner4) {};
    \node[mynode, below=2mm of inner4] (justbelow4) {};
    \node[mynode, below=2mm of justbelow4] (justbelow4b) {};
    \node[mynode, below=2mm of justbelow4b] (justbelow4c) {};
    \begin{scope}[on background layer]
    \node[fit={(lab) (inner1) (justbelow4c.south-|inner1.south)}, draw,fill=red!20] (outer1) {};
    \node[fit={(cal) (inner2) (justbelow2c)}, draw,fill=red!20] (outer2) {};
    \node[fit={(img) (inner3) (justbelow3c)}, draw,fill=red!20] (outer3) {};
    \node[fit={(tech) (inner4) (justbelow4c)}, draw,fill=red!20] (outer4) {};
    \end{scope}
    \path (outer1) -- (outer2) node[pos=0.45,my arrow]{}
    (outer2) -- (outer3) node[pos=0.45,my arrow]{}
    (outer4) -- (outer3) node[pos=0.45,my arrow,shape border rotate=180]{};
\end{tikzpicture}
\end{document}

network-complex-networks-only-layer1.tex

% from the manual, page 26

\documentclass[tikz,border=5]{standalone}
\usepackage{tikz-network}

\begin{document} 

\begin{tikzpicture}[multilayer=3d]
	\Vertices[layer=1]{data/ml_vertices.csv}
	\Edges[layer={1,1}]{data/ml_edges.csv}
\end{tikzpicture}

\end{document}

network-complex-networks.tex

% https://tex.stackexchange.com/a/295109/173708

\documentclass[tikz,border=5]{standalone}
\usepackage{tikz-network}   % file tikz-network.sty must be present

\begin{document} 

\begin{tikzpicture}[multilayer=3d]
	\Vertices{data/ml_vertices.csv}
	\Edges{data/ml_edges.csv}
\end{tikzpicture}

\end{document}

network-layers-and-layouts.tex

% manual, page 27
\documentclass[tikz,border=5]{standalone}
\usepackage{tikz-network}  % tikz-network.sty file must be present

\begin{document} 
\begin{tikzpicture}[multilayer=3d]
    \begin{Layer}[layer=1]
        \draw[very thick] (-.5,-.5) rectangle (2.5,2);
        \node at (-.5,-.5)[below right]{Layer 1};
    \end{Layer}
	\Vertices[layer=1]{data/ml_vertices.csv}
	\Edges[layer={1,1}]{data/ml_edges.csv}
\end{tikzpicture}

\end{document}

network-multilayer.tex

% from manual https://www.researchgate.net/profile/Juergen_Hackl/publication/319894904_TikZ-network_manual/links/59cb46e2a6fdcc451d5c91ff/TikZ-network-manual.pdf?origin=publication_detail

\documentclass[tikz,border=5]{standalone}
\usepackage{tikz-network}     % tikz-network.sty file must be present

\begin{document} 
\begin{tikzpicture}[multilayer=3d]
    \Vertex[x=0.5,IdAsLabel,layer=1]{A}
    \Vertex[x=1.5,IdAsLabel,layer=1]{B}
    \Vertex[x=1.5,IdAsLabel,layer=2]{C}
    \Edge[bend=60](A)(B)
    \Edge[style=dashed](B)(C)
    \Edge(C)(C)
\end{tikzpicture}
\end{document}

network-read-csv.tex

% from manual https://www.researchgate.net/profile/Juergen_Hackl/publication/319894904_TikZ-network_manual/links/59cb46e2a6fdcc451d5c91ff/TikZ-network-manual.pdf?origin=publication_detail

\documentclass[tikz,border=5]{standalone}
\usepackage{tikz-network}  % tikz-network.sty file must be present

\begin{document} 
\begin{tikzpicture}
	\Vertices{data/vertices.csv}
	\Edges{data/edges.csv}
\end{tikzpicture}
\end{document}

nn_2figs_1page+neuralnet.tex

% https://github.com/dreading/tex-neural-network
% https://medium.com/momenton/typesetting-neural-network-diagrams-with-tex-4920b6b9fc19

\documentclass{article}

% Preamble
\usepackage{tikz}
\usetikzlibrary{matrix,chains,positioning,decorations.pathreplacing,arrows}

\begin{document}

 % Listing 1: Tex for neural network layers
\begin{figure}

    \centering
    
    \begin{tikzpicture}[
         % define styles 
          clear/.style={
          draw=none,
          fill=none,
          },
        net/.style={
          matrix of nodes,
          nodes={
               draw,
               circle,
               inner sep=10pt
          },
          nodes in empty cells,
          column sep=2cm,
          row sep=-19pt
          } 
    ]
        % define matrix mat to hold nodes
        % using net as default style for cells
        \matrix[net] (mat)
        {
            % Define layer headings
            |[clear]| \parbox{1.3cm}{\centering Input\\layer} 
              & |[clear]| \parbox{1.3cm}{\centering Hidden\\layer} 
              & |[clear]| \parbox{1.3cm}{\centering Output\\layer} \\
         
            $\alpha_{0}^{0}$  & |[clear]|        & |[clear]| \\
            |[clear]|         & $\alpha_{0}^{1}$ & |[clear]| \\
            $\alpha_{1}^{0}$  & |[clear]|        & |[clear]| \\
            |[clear]|         & |[clear]|        & |[clear]| \phantom{$\alpha_{0}^{0}$} \\
            $\alpha_{2}^{0}$  & $\alpha_{1}^{1}$ & $\alpha_{0}^{2}$ \\
            |[clear]|         & |[clear]|        & |[clear]|  \phantom{$\alpha_{0}^{0}$} \\
            $\alpha_{3}^{0}$  & |[clear]|        & |[clear]| \\
            |[clear]|         & $\alpha_{2}^{1}$ & |[clear]| \\
            $\alpha_{4}^{0}$  & |[clear]|        & |[clear]| \\ 
        };
        
        
        % left most lines into input layers
        \foreach \ai in {2,4,...,10}
            \draw[<-] (mat-\ai-1) -- +(-2cm,0);
        
        % lines from a_{i}^{0} to each a_{j}^{1}
        \foreach \ai in {2,4,...,10} {
            \foreach \aii in {3,6,9}
                \draw[->] (mat-\ai-1) -- (mat-\aii-2);
                }
        
        % lines from a_{i}^{1} to a_{0}^{2}
        \foreach \ai in {3,6,9}
          \draw[->] (mat-\ai-2) -- (mat-6-3);
            
        % right most line with Output label
        \draw[->] (mat-6-3) -- node[above] {Output} +(3cm,0);
        
    \end{tikzpicture}
    
    \caption{Neural network layers}
    
\end{figure}


% Listing 2: Tex for neural network pipeline
\begin{figure}
    \centering
    \begin{tikzpicture}[
        % define styles    
        init/.style={ 
             draw, 
             circle, 
             inner sep=2pt,
             font=\Huge,
             join = by -latex
        },
        squa/.style={ 
            font=\Large,
            join = by -latex
        }
    ]
        
        % Top chain x1 to w1
        \begin{scope}[start chain=1]
            \node[on chain=1] at (0,1.5cm)  (x1) {$x_1$};
            \node[on chain=1,join=by o-latex] (w1) {$w_1$};
        \end{scope}
        
        % Middle chain x2 to output
        \begin{scope}[start chain=2]
            \node[on chain=2] (x2) {$x_2$};
            \node[on chain=2,join=by o-latex] {$w_2$};
            \node[on chain=2,init] (sigma) {$\displaystyle\Sigma$};
            \node[on chain=2,squa,label=above:{\parbox{2cm}{\centering Activation\\ function}}]   {$f_{act}$};
            \node[on chain=2,squa,label=above:Output,join=by -latex] {$y_{out}$};
        \end{scope}
        
        % Bottom chain x3 to w3
        \begin{scope}[start chain=3]
            \node[on chain=3] at (0,-1.5cm) 
            (x3) {$x_3$};
            \node[on chain=3,label=below:Weights,join=by o-latex]
            (w3) {$w_3$};
        \end{scope}
        
        % Bias
        \node[label=above:\parbox{2cm}{\centering Bias \\ $b$}] at (sigma|-w1) (b) {};
        
        % Arrows joining w1, w3 and b to sigma
        \draw[-latex] (w1) -- (sigma);
        \draw[-latex] (w3) -- (sigma);
        \draw[o-latex] (b) -- (sigma);
        
        % left hand side brace
        \draw[decorate,decoration={brace,mirror}] (x1.north west) -- node[left=10pt] {Inputs} (x3.south west);
        
    \end{tikzpicture}
    
    \caption{Neural network pipeline}
    
\end{figure}


\end{document}

nn_3in_3_h_3_out+neuralnet.tex

% https://newbiettn.github.io/2016/12/16/tikz/
% Unit circle
% Author: The Author
% What this does
\documentclass[landscape]{article}
\usepackage{tikz}

% DON'T FORGET TO ADD THOSE IN THE HEADER OF LATEX FILES
%\usepackage{tikz}
\usetikzlibrary{arrows,backgrounds}
\usepgflibrary{shapes.multipart}

%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>

\begin{comment}
	:Title: the title
	
	Describe the application
\end{comment}

\usepackage[top=1in,bottom=1in,right=1in,left=1in]{geometry}

\begin{document}


\begin{tikzpicture}
\tikzstyle{place}=[circle, draw=black, minimum size = 8mm]

% Input
\draw node at (0, -1.25) [place] (first_1) {$x^{(1)}_0$};
\draw node at (0, -2*1.25) [place] (first_2) {$x^{(1)}_1$};
\draw node at (0, -3*1.25) [place] (first_3) {$x^{(1)}_2$};	

% Hidden 1
\foreach \x in {1,...,3}
\node at (4, -\x*1.25) [place] (second_\x){$a^{(2)}_\x$};

% Output
\foreach \x in {2,...,2}
\node at (8, -\x*1.25) [place] (fourth_\x){$a^{(3)}_\x$};

\foreach \x in {2,...,2}
\node at (10, -\x*1.25) [circle, ] (output_\x){$y_\x$};

% Input -> Hidden
\foreach \i in {1,...,3}
\foreach \j in {1,...,3}
\draw [->] (first_\i) to (second_\j);

% Hidden -> Output
\foreach \i in {1,...,3}
\foreach \j in {2,...,2}
\draw [->] (second_\i) to (fourth_\j);

\foreach \i in {2,...,2}
\draw [->] (fourth_\i) to (output_\i);


%Parameters theta
\node at (2, 0) [black, ] {$\Theta^{(1)}$};
\node at (6, 0) [black, ] {$\Theta^{(2)}$};
\node at (4, 0) [black, ] {$a^{(2)}$};
\node at (8, 0) [black, ] {$a^{(3)}$};

\end{tikzpicture}
\end{document}

nn_back_propagation+neuralnet.tex

% https://davidstutz.de/illustrating-convolutional-neural-networks-in-latex-with-tikz/

%\documentclass[twoside,11pt,a4paper]{article}
\documentclass{standalone}
 
\usepackage[utf8]{inputenc}
\usepackage{amsmath, amssymb, latexsym}
\usepackage{sidecap}
 
\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}
 
\begin{document}
 
\begin{tikzpicture}[shorten >=1pt]
     \tikzstyle{unit}=[draw,shape=circle,minimum size =1.4cm]

     \node[unit](i) at (0,1){$y_i^{(l)}$};
     \node[unit](k1) at (3,2){$y_1^{(l+1)}$};
	\node at (3, 1){$\vdots$};
	\node[unit](km) at (3,-0.25){$y_{m^{(l+1)}}^{(l+1)}$};
	
	\node at (1.25,2.25){$\delta_1^{(l+1)}$};
	\node at (1.25,-0.5){$\delta_{m^{(l+1)}}^{(l+1)}$};

       	\draw[->] (i) -- (k1);
	\draw[->] (i) -- (km);
	
	\draw[->,red,line width=0.05cm] (2,-0.25) -- (0.75,0.3);
	\draw[->,red,line width=0.05cm] (2,2) -- (0.75,1.6);
\end{tikzpicture}
 
\end{document}

nn_encoder_2pages_3figs_+neuralnet.tex

% https://davidstutz.de/illustrating-convolutional-neural-networks-in-latex-with-tikz/

\documentclass[twoside,11pt,a4paper]{article}
 
\usepackage[utf8]{inputenc}
\usepackage{amsmath, amssymb, latexsym}
 
\usepackage{tikz}
 
\usepackage{xcolor}
\definecolor{fc}{HTML}{1E90FF}
\definecolor{h}{HTML}{228B22}
\definecolor{bias}{HTML}{87CEFA}
\definecolor{noise}{HTML}{8B008B}
\definecolor{conv}{HTML}{FFA500}
\definecolor{pool}{HTML}{B22222}
\definecolor{up}{HTML}{B22222}
\definecolor{view}{HTML}{FFFFFF}
\definecolor{bn}{HTML}{FFD700}
\tikzset{fc/.style={black,draw=black,fill=fc,rectangle,minimum height=1cm}}
\tikzset{h/.style={black,draw=black,fill=h,rectangle,minimum height=1cm}}
\tikzset{bias/.style={black,draw=black,fill=bias,rectangle,minimum height=1cm}}
\tikzset{noise/.style={black,draw=black,fill=noise,rectangle,minimum height=1cm}}
\tikzset{conv/.style={black,draw=black,fill=conv,rectangle,minimum height=1cm}}
\tikzset{pool/.style={black,draw=black,fill=pool,rectangle,minimum height=1cm}}
\tikzset{up/.style={black,draw=black,fill=up,rectangle,minimum height=1cm}}
\tikzset{view/.style={black,draw=black,fill=view,rectangle,minimum height=1cm}}
\tikzset{bn/.style={black,draw=black,fill=bn,rectangle,minimum height=1cm}}
 
\begin{document}
 
\begin{figure}[t]
  \centering
  \begin{tikzpicture}
    \node (x) at (0.5,0) {$x$};
    \node[fc] (fc1) at (2,0) {\small$\text{fc}_{C_0, C_1}$};
    \node[bias] (b1) at (3.5,0) {\small$\text{bias}$};
    \node[h] (h1) at (4.5,0) {\small$h$};
    \node[fc] (fc2) at (5.75,0) {\small$\text{fc}_{C_1, C_2}$};
    \node[bias] (b2) at (7.25,0) {\small$\text{bias}$};
    \node[h] (h2) at (8.25,0) {\small$h$};
    \node[fc] (fc3) at (9.5,0) {\small$\text{fc}_{C_2, C_3}$};
    \node[bias] (b3) at (11,0) {\small$\text{bias}$};
    \node[h] (h3) at (12,0) {\small$h$};
    \node (y) at (13.5,0) {\small$y$};
    \draw[->] (x) -- (fc1);
    \draw[->] (fc1) -- (b1);
    \draw[->] (b1) -- (h1);
    \draw[->] (h1) -- (fc2);
    \draw[->] (fc2) -- (b2);
    \draw[->] (b2) -- (h2);
    \draw[->] (h2) -- (fc3);
    \draw[->] (fc3) -- (b3);
    \draw[->] (b3) -- (h3);
    \draw[->] (h3) -- (y);
  \end{tikzpicture}
%  \vskip 6px
  % TODO short caption
  % TODO parameters
  \caption[]{Illustration of a multi-layer perceptron with $L = 3$ fully-connected 
  layers followed by bias layers and non-linearities. The sizes $C_1$ and $C_2$ are
  hyper-parameters while $C_0$ and $C_3$ are determined by the problem at hand.
Overall, the multi-layer perceptron represents a function $y(x;w)$ parameterized by
the weights $w$ in the fully-connected and bias layers.}
  \label{fig:deep-learning-mlp}
\end{figure}
 
\begin{figure}
  \centering
  \begin{tikzpicture}
    \node (x) at (1.25,0) {\small$x$};
  
    \node[fc,rotate=90,minimum width=2cm] (fc1) at (2.5,0) {\small$\text{fc}_{R, C_1}$};
    \node[bias,rotate=90,minimum width=2cm] (b1) at (3.75,0) {\small$\text{bias}$};
    \node[h,rotate=90,minimum width=2cm] (h1) at (5,0) {\small$h$};
    \node[fc,rotate=90,minimum width=2cm] (fc2) at (6.25,0) {\small$\text{fc}_{C_1, C_2}$};
    \node[bias,rotate=90,minimum width=2cm] (b2) at (7.5,0) {\small$\text{bias}$};
    \node[h,rotate=90,minimum width=2cm] (h2) at (8.75,0) {\small$h$};
    \node[fc,rotate=90,minimum width=2cm] (fc3) at (10,0) {\small$\text{fc}_{C_2, Q}$};
    \node[bias,rotate=90,minimum width=2cm] (b3) at (11.25,0) {\small$\text{bias}$};
    \node[h,rotate=90,minimum width=2cm] (h3) at (12.5,0) {\small$h$};
  
    \node (z) at (13.75,-2.5) {\small$z$};
  
    \node[h,rotate=90,minimum width=2cm] (h6) at (2.5,-2.5) {\small$h$};
    \node[bias,rotate=90,minimum width=2cm] (b6) at (3.75,-2.5) {\small$\text{bias}$};
    \node[fc,rotate=90,minimum width=2cm] (fc6) at (5,-2.5) {\small$\text{fc}_{C_1, R}$};
    \node[h,rotate=90,minimum width=2cm] (h5) at (6.25,-2.5) {\small$h$};
    \node[bias,rotate=90,minimum width=2cm] (b5) at (7.5,-2.5) {\small$\text{bias}$};
    \node[fc,rotate=90,minimum width=2cm] (fc5) at (8.75,-2.5) {\small$\text{fc}_{C_2, C_1}$};
    \node[h,rotate=90,minimum width=2cm] (h4) at (10,-2.5) {\small$h$};
    \node[bias,rotate=90,minimum width=2cm] (b4) at (11.25,-2.5) {\small$\text{bias}$};
    \node[fc,rotate=90,minimum width=2cm] (fc4) at (12.5,-2.5) {\small$\text{fc}_{Q, C_2}$};
  
    \node (rx) at (1.25,-2.5) {\small$\tilde{x}$};
  
    \draw[->] (x) -- (fc1);
    \draw[->] (fc1) -- (b1);
    \draw[->] (b1) -- (h1);
    \draw[->] (h1) -- (fc2);
    \draw[->] (fc2) -- (b2);
    \draw[->] (b2) -- (h2);
    \draw[->] (h2) -- (fc3);
    \draw[->] (fc3) -- (b3);
    \draw[->] (b3) -- (h3);
    \draw[-] (h3) -- (13.75,0);
    \draw[->] (13.75,0) -- (z);
    \draw[->] (z) -- (fc4);
    \draw[->] (fc4) -- (b4);
    \draw[->] (b4) -- (h4);
    \draw[->] (h4) -- (fc5);
    \draw[->] (fc5) -- (b5);
    \draw[->] (b5) -- (h5);
    \draw[->] (h5) -- (fc6);
    \draw[->] (fc6) -- (b6);
    \draw[->] (b6) -- (h6);
    \draw[->] (h6) -- (rx);
 
    \node[rotate=90] (L) at (1.25, -1.25) {\small$\mathcal{L}(\tilde{x}, x)$};
    \draw[-,dashed] (x) -- (L);
    \draw[-,dashed] (rx) -- (L);
  \end{tikzpicture}
%  \vskip 6px
  \caption{A simple variant of a multi-layer perceptron based auto-encoder.
  Both encoder (top) and decoder (bottom) consist of 3-layer perceptrons
  taking an $R$-dimensional
  input $x$. The parameters $C_1, C_2,$ and $Q$ can be chosen; $Q$ also
  determines the size of the latent code $z$ and is usually chosen significantly
  lower than $R$ such that the auto-encoder learns a dimensionality reduction.
  The non-linearity $h$ is also not fixed and might be determined experimentally.
  The reconstruction loss $\mathcal{L}(\tilde{x}, x)$ quantifies the quality of
  the reconstruction $\tilde{x}$ and is minimized during training.}
  \label{subfig:deep-learning-auto-encoder}
\end{figure}
 
\begin{figure}
  \centering
  \begin{tikzpicture}
    \node (x) at (1.25,0) {\small$x$};
    
    %\node[noise,rotate=90,minimum width=3.3cm] (noise1) at(1.25,0) {\small$\text{noise}_{\sigma^2}$};
    \node[conv,rotate=90,minimum width=3.3cm] (conv1) at (2.5,0) {\small$\text{conv}_{1, C_1, K}$\,+\,$\text{bias}$};
    %\node[bias,rotate=90,minimum width=3cm] (bias1) at (3.75,0) {$\text{bias}$};
    \node[h,rotate=90,minimum width=3.3cm] (h1) at (3.75,0) {\small$h$};
    \node[pool,rotate=90,minimum width=3.3cm] (pool1) at (5,0) {\small$\text{pool}_{2}$};
    
    \node[conv,rotate=90,minimum width=3.3cm] (conv2) at (6.25,0) {\small$\text{conv}_{C_1, C_2, K}$\,+\,$\text{bias}$};
    %\node[bias,rotate=90,minimum width=3cm] (bias2) at (8.75,0) {$\text{bias}$};
    \node[h,rotate=90,minimum width=3.3cm] (h2) at (7.5,0) {\small$h$};
    \node[pool,rotate=90,minimum width=3.3cm] (pool2) at (8.75,0) {\small$\text{pool}_{2}$};
    \node[view,rotate=90,minimum width=3.3cm] (view2) at (10,0) {\small$\text{view}_{B, C_3}$};
    \node[fc,rotate=90,minimum width=3.3cm] (fc2) at (11.25,0) {\small$\text{fc}_{C_3,Q}$};
    
    \node (z) at (12.5,-3.75) {\small$z$};
    
    \node[h,rotate=90,minimum width=3.3cm] (h4) at (6.25,-3.75) {\small$h$};
    %\node[bias,rotate=90,minimum width=3cm] (bias4) at (8.75,-3.75) {$\text{bias}$};
    \node[conv,rotate=90,minimum width=3.3cm] (conv4) at (7.5,-3.75) {\small$\text{conv}_{C_2, C_1, K}$\,+\,$\text{bias}$};
    \node[up,rotate=90,minimum width=3.3cm] (up4) at (8.75,-3.75) {\small$\text{nnup}_{2}$};
    \node[view,rotate=90,minimum width=3.3cm] (view4) at (10,-3.75) {\small$\text{view}_{B, C_2, \frac{H}{4}, \frac{W}{4}, \frac{D}{4}}$};
    \node[fc,rotate=90,minimum width=3.3cm] (fc4) at (11.25,-3.75) {\small$\text{fc}_{Q,C_3}$};
    
    \node[h,rotate=90,minimum width=3.3cm] (h5) at (2.5,-3.75) {\small$h$};
    %\node[bias,rotate=90,minimum width=3cm] (bias5) at (3.75,-4) {$\text{bias}$};
    \node[conv,rotate=90,minimum width=3.3cm] (conv5) at (3.75,-3.75) {\small$\text{conv}_{C_2, 1, K}$\,+\,$\text{bias}$};
    \node[up,rotate=90,minimum width=3.3cm] (up5) at (5,-3.75) {\small$\text{nnup}_{2}$};
    
    \node (rx) at (1.25,-3.75) {\small$\tilde{x}$};
    
    %\draw[->] (x) -- (noise1);
    \draw[->] (x) -- (conv1);
    \draw[->] (conv1) -- (h1);
    %\draw[->] (bias1) -- (h1);
    \draw[->] (h1) -- (pool1);
    
    \draw[->] (pool1) -- (conv2);
    \draw[->] (conv2) -- (h2);
    %\draw[->] (bias2) -- (h2);
    \draw[->] (h2) -- (pool2);
    \draw[->] (pool2) -- (view2);
    \draw[->] (view2) -- (fc2);
    
    \draw[-] (fc2) -- (12.5,0);
    \draw[->] (12.5,0) -- (z);
    \draw[->] (z) -- (fc4);
    
    \draw[->] (fc4) -- (view4);
    \draw[->] (view4) -- (up4);
    \draw[->] (up4) -- (conv4);
    %\draw[->] (conv4) -- (bias4);
    \draw[->] (conv4) -- (h4);
    
    \draw[->] (h4) -- (up5);
    \draw[->] (up5) -- (conv5);
    \draw[->] (conv5) -- (h5);
    %\draw[->] (bias5) -- (h5);
    \draw[->] (h5) -- (rx);
 
    \node[rotate=90] (L) at (1.25, -1.875) {\small$\mathcal{L}(\tilde{x}, x)$};
    \draw[-,dashed] (x) -- (L);
    \draw[-,dashed] (rx) -- (L);
  \end{tikzpicture}
%  \vskip 6px
  % TODO short caption
  \caption{Illustration of a convolutional auto-encoder consisting of encoder (top)
  and decoder (bottom). Both are modeled using two stages of convolutional
  layers each followed by a bias layer and a non-linearity layer. The encoder uses
  max pooling to decrease the spatial size of the input; the decoder uses upsampling
  to increase it again. The number of channels $C_1$, $C_2$ and $C_3$ as well as
  the size $Q$ are hyper parameters. We assume the input to comprise one channel.
  Again, the reconstruction loss $\mathcal{L}(\tilde{x}, x)$ quantifies the quality of
  the reconstruction and is minimized during training.}
  \label{fig:deep-learning-convolutional-auto-encoder}
\end{figure}
 
\end{document}

nn_neuron+neuralnet.tex

% https://github.com/FriendlyUser/LatexDiagrams
\documentclass[tikz]{standalone}
\usepackage{tikz}
\usetikzlibrary{shapes,snakes}
\usetikzlibrary{calc, shapes.geometric,shapes.symbols,fit,positioning,shadows}
\begin{document}
\begin{tikzpicture}
\node [circle split,draw,rotate=90, align=center,label={[anchor=north, inner sep=0pt, yshift=1.2em] east:{\selectfont Neural Body}}] (part){\rotatebox{-90}{ \parbox{1.5cm}{Network input to neuron z} } \nodepart{lower} \rotatebox{-90}{\parbox{1.5cm}{Neuron Output o}} };
\draw[->,rounded corners=5pt] (part.south) -- ($(part.south)+(1.5,0)$);
\node[right = 3 em of part.south, label=Neuron Output] () {};

\node[above left = 0em and 10em of part.east] (t1) {$I_1-$Input 1};
\node[left = 4em of part.north] (t2) {$I_2-$Input 2};
\node[below left = 4em and 4em of part.north] (t3) {$I_3-$Input 3};

\draw[->] (t1) -- (part) node[midway,sloped,above] {$W_1$};
\draw[->] (t2) -- (part) node[midway,sloped,above] {$W_2$};
\draw[->] (t3) -- (part) node[midway,sloped,above] {$W_3$};
\end{tikzpicture}
\end{document}

nn_signal_flow+neuralnet.tex

% https://newbiettn.github.io/2016/12/16/tikz/
% Unit circle
% Author: The Author
% What this does
\documentclass[landscape]{article}
\usepackage{tikz}

% DON'T FORGET TO ADD THOSE IN THE HEADER OF LATEX FILES
%\usepackage{tikz}
\usetikzlibrary{arrows,backgrounds}
\usepgflibrary{shapes.multipart}

%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>

\begin{comment}
	:Title: the title
	
	Describe the application
\end{comment}

\usepackage[top=1in,bottom=1in,right=1in,left=1in]{geometry}

\begin{document}


\begin{tikzpicture}
\tikzstyle{rectangle_style}=[rectangle, draw]
\tikzstyle{dividedrectangle_style}=[draw, rectangle split, rectangle split parts=2, rotate = 90, minimum height = 15mm, minimum width = 10mm]

% neuron i
\foreach \x in {0,...,2}
\draw node at (0, -\x) [rectangle_style] (neuron_i_\x) {$y_\x$};
\foreach \x in {1,...,3}
\fill (0, -2.5 - \x*0.15) circle (1pt);
\draw node at (0, -3.5) [rectangle_style] (neuron_i_3) {$y_i$};

% w_ji
\foreach \x in {0,...,2}
\draw node at (1.5, -\x) [] (w_ji_\x) {$w_{j\x}$};
\draw node at (1.5, -3.5) [] (w_ji_i) {$w_{ji}$};
\foreach \x in {1,...,3}
\fill (1.5, -2.5 - \x*0.15) circle (1pt);

% neuron j
\node at (6.5, -1.5) [dividedrectangle_style] (neuron_j){\rotatebox{-90}{$s_j = \sum {w_{ji}y_i}$} \nodepart{second} \rotatebox{-90}{$y_j = \varphi (s_j)$}};
\foreach \x in {1,...,3}
\fill (6.5, -2.25 - \x*0.15) circle (1pt);
\foreach \x in {1,...,3}
\fill (6.5,  - 0.15 - \x*0.15) circle (1pt);

% output
\node at (10, -1.5) [circle, draw, fill=black] (output) {$$};

% desired output
\node at (10, 0) [] (desired_output) {$d_j$};

% error
\node at (12, -1.5) [] (error) {$e_j = d_j - y_j$};

% connect: y_i -> w_ji
\foreach \i in {0,...,2}
\path[-] (neuron_i_\i) edge node[] {} (w_ji_\i);
\path[-] (neuron_i_3) edge node[] {} (w_ji_i);

% connect: w_ji -> neuron j
\foreach \i in {0,...,2}
\path[->] (w_ji_\i) edge node[] {} (neuron_j);
\path[->] (w_ji_i) edge node[] {} (neuron_j);

% connect: neuron j -> output
\path[->] (neuron_j) edge node[above, midway] {$$} (output);

% connect: desired output -> output
\path[->] (desired_output) edge node[] {} (output);

% connect: output -> error
\path[->] (output) edge node[] {} (error);

\end{tikzpicture}
\end{document}

nn-02_auto_net+neuralnet+foreach+pgf+style+learn.tex

\documentclass[tikz,border=2mm]{standalone}


\begin{document}


\begin{tikzpicture}
[   cnode/.style={draw=black,fill=#1,minimum width=3mm,circle},
]
    \node[cnode=red,label=0:$\Sigma$] (s) at (6,-3) {};
    \node at (0,-4) {$\vdots$};
    \node at (3,-4) {$\vdots$};
    \foreach \x in {1,...,4}
    {   \pgfmathparse{\x<4 ? \x : "n"}
        \node[cnode=blue,label=180:$x_{\pgfmathresult}$] (x-\x) at (0,{-\x-div(\x,4)}) {};
        \node[cnode=gray,label=90:$\varphi_{\pgfmathresult}$] (p-\x) at (3,{-\x-div(\x,4)}) {};
        \draw (p-\x) -- node[above,sloped,pos=0.3] {$\omega_{\pgfmathresult}$} (s);
    }
    \foreach \x in {1,...,4}
    {   \foreach \y in {1,...,4}
        {   \draw (x-\x) -- (p-\y);
        }
    }
\end{tikzpicture}

\end{document}

nn-03_auto_net+neuralnet+foreach+style+learn.tex

\documentclass{standalone}

\usepackage{tikz}
\usepackage{verbatim}

\begin{comment}
:Title: Neural network
:Tags: Foreach

The ``\foreach`` command is very useful for quickly creating structured graphics
like this neural network diagram.
\end{comment}

\begin{document}
\pagestyle{empty}
\def\layersep{2.5cm}

\begin{tikzpicture}[shorten >=1pt,->,draw=black!50, node distance=\layersep]
    \tikzstyle{every pin edge}=[<-,shorten <=1pt]
    \tikzstyle{neuron}=[circle,fill=black!25,minimum size=17pt,inner sep=0pt]
    \tikzstyle{input neuron}=[neuron, fill=green!50];
    \tikzstyle{output neuron}=[neuron, fill=red!50];
    \tikzstyle{hidden neuron}=[neuron, fill=blue!50];
    \tikzstyle{annot} = [text width=4em, text centered]

    % Draw the input layer nodes
    \foreach \name / \y in {1,...,4}
    % This is the same as writing \foreach \name / \y in {1/1,2/2,3/3,4/4}
        \node[input neuron, pin=left:Input \#\y] (I-\name) at (0,-\y) {};

    % Draw the hidden layer nodes
    \foreach \name / \y in {1,...,5}
        \path[yshift=0.5cm]
            node[hidden neuron] (H-\name) at (\layersep,-\y cm) {};

    % Draw the output layer node
    \node[output neuron,pin={[pin edge={->}]right:Output}, right of=H-3] (O) {};
    \node[output neuron,pin={[pin edge={->}]right:Output}, right of=H-3] (1) {};

    % Connect every node in the input layer with every node in the
    % hidden layer.
    \foreach \source in {1,...,4}
        \foreach \dest in {1,...,5}
            \path (I-\source) edge (H-\dest);

    % Connect every node in the hidden layer with the output layer
    \foreach \source in {1,...,5} {
        \path (H-\source) edge (O);
        \path (H-\source) edge (1);
    
    }
    

    % Annotate the layers
    \node[annot,above of=H-1, node distance=1cm] (hl) {Hidden layer};
    \node[annot,left of=hl] {Input layer};
    \node[annot,right of=hl] {Output layer};
\end{tikzpicture}
% End of code
\end{document}

nn-04_auto_net+neuralnet+matrix+style+foreach.tex

\documentclass[landscape]{article}
\usepackage{tikz}

%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>


\usepackage[margin=1cm]{geometry}
\usepackage{tikz,pgfplots,pgf}
\usetikzlibrary{matrix,shapes,arrows,positioning}

\begin{document}

\begin{figure}[htp]
\centering

\begin{tikzpicture}[
  plain/.style={
    draw=none,
    fill=none,
    },
  dot/.style={draw,shape=circle,minimum size=3pt,inner sep=0,fill=black
    },
  net/.style={
    matrix of nodes,
    nodes={
      draw,
      circle,
      inner sep=8.5pt
      },
    nodes in empty cells,
    column sep=0.6cm,
    row sep=-11pt
    },
  >=latex
  ]
  \matrix[net] (mat)
  {
  |[plain]| \parbox{1cm}{\centering Input\\layer} 
            & |[plain]| \parbox{1cm}{\centering Hidden\\layer} 
                        & |[plain]| \parbox{1cm}{\centering Output\\layer} \\
            & |[plain]|                 \\
  |[plain]| &            & |[plain]|    \\
            & |[plain]|  &              \\
  |[plain]| & |[dot]|                   \\
            & |[plain]|  & |[dot]|      \\
  |[plain]| & |[dot]|    & |[plain]|    \\
  |[dot]|   & |[plain]|  & |[dot]|      \\
  |[dot]|   & |[dot]|    & |[plain]|    \\
  |[dot]|   & |[plain]|  &              \\
  |[plain]| &            & |[plain]|    \\
            & |[plain]|                 \\
  };
  \foreach \ai/\mi in {2/I1,4/I2,6/I3,12/In}
    \draw[<-] (mat-\ai-1) -- node[above] {\mi} +(-1cm,0);
  \foreach \ai in {2,4,6,12}
  {\foreach \aii/\mii in {3/H1,11/Hn}
    \draw[->] (mat-\ai-1) -- (mat-\aii-2) node[yshift=0.6cm] {\mii};
  }
  \foreach \ai in {3,11}
  {  \draw[->] (mat-\ai-2) -- (mat-4-3);
    \draw[->] (mat-4-3) -- node[above] {O1} +(1cm,0);}
  \foreach \ai in {3,11}
  {  \draw[->] (mat-\ai-2) -- (mat-10-3);
    \draw[->] (mat-10-3) -- node[above] {On} +(1cm,0);}
\end{tikzpicture}

\caption{ANN diagram for Speed Sign recognition.}
\label{fig_m_3}
\end{figure}

\end{document}

nn-05_auto_net_arr+neuralnet+style+foreach+learn.tex

\documentclass[border=0.125cm]{standalone}
\usepackage{tikz}
\usetikzlibrary{positioning}

\begin{document}


\tikzset{%
  every neuron/.style={
    circle,
    draw,
    minimum size=1cm
  },
  neuron missing/.style={
    draw=none, 
    scale=4,
    text height=0.333cm,
    execute at begin node=\color{black}$\vdots$
  },
}

\begin{tikzpicture}[x=1.5cm, y=1.5cm, >=stealth]

	% input layer
	\foreach \m/\l [count=\y] in {1,2,3,missing,4}
	  \node [every neuron/.try, neuron \m/.try] (input-\m) at (0,2.5-\y) {};
	
	% hidden layer
	\foreach \m [count=\y] in {1,missing,2}
	  \node [every neuron/.try, neuron \m/.try ] (hidden-\m) at (2,2-\y*1.25) {};
	
	% output layer
	\foreach \m [count=\y] in {1,missing,2}
	  \node [every neuron/.try, neuron \m/.try ] (output-\m) at (4,1.5-\y) {};
	
	% labels for input layer
	\foreach \l [count=\i] in {1,2,3,n}
	  \draw [<-] (input-\i) -- ++(-1,0)
	    node [above, midway] {$I_\l$};
	
	% labels for hidden layer
	\foreach \l [count=\i] in {1,n}
	  \node [above] at (hidden-\i.north) {$H_\l$};
	
	% labels for output layer
	\foreach \l [count=\i] in {1,n}
	  \draw [->] (output-\i) -- ++(1,0)
	    node [above, midway] {$O_\l$};
	
	% connections for input layer
	\foreach \i in {1,...,4}
	  \foreach \j in {1,...,2}
	    \draw [->] (input-\i) -- (hidden-\j);
	
	% connections for hidden to output layer
	\foreach \i in {1,...,2}
	  \foreach \j in {1,...,2}
	    \draw [->] (hidden-\i) -- (output-\j);
	
	% labels for each layer at the top
	\foreach \l [count=\x from 0] in {Input, Hidden, Ouput}
	  \node [align=center, above] at (\x*2,2) {\l \\ layer};

\end{tikzpicture}

\end{document}

nn-06_manual_net_color+neuralnet+foreach+style.tex

\documentclass{standalone}
\usepackage[usenames,dvipsnames]{xcolor}
\usepackage{tikz}
\usetikzlibrary{calc}
\usetikzlibrary{arrows}

\begin{document}

\begin{tikzpicture}
  %%Create a style for the arrows we are using
  \tikzset{normal arrow/.style={draw, thin}}
  %%Create the different coordinates to place the nodes
  \path (0,0) coordinate (1) ++(0,-2) coordinate (2) ++(0,-2) coordinate (3);
  \path (1) ++(-3,-.2) coordinate (x1);
  \path (3) ++(-3, .2) coordinate (x2);
  %%Use the calc library and partway modifiers to generate the second and third level points
  \path ($(1)!.5!(2)!3 cm!90:(2)$) coordinate (4);
  \path ($(2)!.5!(3)!3 cm!90:(3)$) coordinate (5);
  \path ($(4)!.5!(5)!3 cm!90:(5)$) coordinate (6);
  \path (6) ++(3,0) coordinate (7);
  %%Place nodes at each point using the foreach construct
  \foreach \i/\color in {1/Magenta!60,2/MidnightBlue!60,3/CadetBlue!80,4/CadetBlue!80,5/CadetBlue!80,6/CadetBlue!80}{
    \node[draw,circle,shading=axis,top color=\color, bottom color=\color!black,shading angle=45] (n\i) at (\i) {$f_{\i}(e)$};
  }
  %%Place the remaining nodes separately
  \node (nx1) at (x1) {$\mathbf{x_1}$};
  \node (nx2) at (x2) {$\mathbf{x_2}$};
  \node (ny)  at (7)  {$\mathbf{y}$};
  %%Drawing the arrows
  \path[normal arrow] (nx1) -- (n1);
  \path[normal arrow] (nx1) -- (n3);
  \path[normal arrow] (nx2) -- (n1);
  \path[normal arrow] (nx2) -- (n3);
  \path[normal arrow] (n1)  -- (n4);
  \path[normal arrow] (n1)  -- (n5);
  \path[normal arrow] (n2)  -- (n4);
  \path[normal arrow] (n2)  -- (n5);
  \path[normal arrow] (n3)  -- (n4);
  \path[normal arrow] (n3)  -- (n5);
  \path[normal arrow] (n4)  -- (n6);
  \path[normal arrow] (n5)  -- (n6);
  \path[normal arrow] (n6)  -- (ny);
  %%Drawing the cyan arrows including the labels
  \path[normal arrow,Cyan] (nx1) -- node[above=.5em,Cyan] {$\mathbf{w_{(x1)2}}$} (n2);
  \path[normal arrow,Cyan] (nx2) -- node[below=.5em,Cyan] {$\mathbf{w_{(x2)2}}$} (n2);
\end{tikzpicture}
\end{document}

nn-08-tkz-berge-01+neuralnet+scope+foreach+pkg.tex

\documentclass[border=5cm]{standalone}

\usepackage{tikz}    
\usepackage{xcolor}
\usepackage{tkz-berge}


\begin{document}


\begin{tikzpicture} 
    \renewcommand*{\VertexBallColor}{green!80!black}
    \GraphInit[vstyle=Shade] 
     \grComplete[RA=5]{6}
\end{tikzpicture}

\begin{tikzpicture}
    \renewcommand*{\VertexBallColor}{green!80!black}
    \GraphInit[vstyle=Shade] 

    \grPath[Math,prefix=p,RA=2,RS=0]{2} 
    \grPath[Math,prefix=q,RA=2,RS=3]{2}

    \begin{scope}[xshift=4cm, yshift=-1cm]
        \grPath[Math,prefix=r,RA=2,RS=0]{1} 
    \end{scope}

    \begin{scope}[xshift=4cm, yshift=4cm]
        \grPath[Math,prefix=s,RA=2,RS=0]{1} 
    \end{scope}

    \foreach \from in { 0,...,1}{
        \EdgeFromOneToAll{p}{q}{\from}{2}
    }
    \EdgeFromOneToAll{r}{q}{0}{2}
    \EdgeFromOneToAll{r}{p}{0}{2}

    \EdgeFromOneToAll{s}{q}{0}{2}
    \EdgeFromOneToAll{s}{p}{0}{2}
    \EdgeFromOneToAll{s}{r}{0}{1}

\end{tikzpicture}

\end{document}

nn-09_manual_net+neuralnet+foreach+scope.tex

\documentclass[border=1cm]{standalone}

\usepackage{tikz}
\usetikzlibrary{backgrounds}

\usepackage{xcolor}



\begin{document}

 \begin{tikzpicture}
  [
    every node/.style={circle, 
      fill=green,
      minimum width=15mm,
      draw,shading=axis,
      top color=green, 
      bottom color=green!50!black}
  ]

  \node (a) at (0,0){ one};
  \node (b) at (0,2) {two};
  \node (c) at (4,2) {three}; 
  \node (d) at (4,0) {four}; 
  \node (e) at (8,-2) {five}; 
  \node (f) at (8,3){six}; 

  \begin{scope}[on background layer]
    \foreach \alpha in {a,b,c,d,e,f}%
    {%
    \foreach \alphb in {a,b,c,d,e}%
    {%
    \draw (\alpha) -- (\alphb);%
    }}
  \end{scope}
\end{tikzpicture}


\end{document}

nn-1h_manual_net+neuralnet+style+matrix+foreach.tex

% https://tex.stackexchange.com/questions/353993/neural-network-graph
\documentclass[landscape]{article}
\usepackage{tikz}

%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>

\usepackage{tikz}
\usetikzlibrary{matrix,chains,positioning,decorations.pathreplacing,arrows}

\begin{document}

\begin{figure}[htp]
\centering
\begin{tikzpicture}[
    plain/.style={
        draw=none,
        fill=none,
    },
    net/.style={
        matrix of nodes,
        nodes={
            draw,
            circle,
            inner sep=8.5pt
        },
        nodes in empty cells,
        column sep=0.6cm,
        row sep=-11pt
    },
    >=latex
    ]

    \matrix[net] (mat)
    {
        |[plain]| \parbox{1cm}{\centering Input\\layer} & |[plain]| \parbox{1cm}{\centering Hidden\\layer} & |[plain]| \parbox{1cm}{\centering Output\\layer} \\
        |[plain]| & \\
        & |[plain]| \\
        |[plain]| & &  \\
        & |[plain]| \\
        |[plain]| & &  \\
        & |[plain]| \\
        |[plain]| & \\
    };
    \foreach \ai [count=\mi ]in {3,5,7}
    \draw[<-] (mat-\ai-1) -- node[above] {Input \mi} +(-2cm,0);
    \foreach \ai in {3,5,7}
    {\foreach \aii in {2,4,...,8}
        \draw[->] (mat-\ai-1) -- (mat-\aii-2);
    }
    \foreach \ai in {2,4,...,8}
    \draw[->] (mat-\ai-2) -- (mat-6-3);

    \foreach \ai in {2,4,...,8}
    \draw[->] (mat-\ai-2) -- (mat-4-3);

    \foreach \ai [count=\mi ]in {4,6}
    \draw[->] (mat-\ai-3) -- node[above] {Output \mi} +(2cm,0);
    \foreach \ai in {3,5,7}
    {\foreach \aii in {2,4,...,8}
        \draw[->] (mat-\ai-1) -- (mat-\aii-2);
    }
\end{tikzpicture}

\end{figure}
\end{document}

nn-2_summarized+neuralnet+style+learn.tex

\documentclass{standalone}
\usepackage{tikz}
\usetikzlibrary{matrix,chains,positioning,decorations.pathreplacing,arrows}


\begin{document}


\begin{tikzpicture}[
	init/.style={
	  draw,
	  circle,
	  inner sep=2pt,
	  font=\Huge,
	  join = by -latex
	},
	squa/.style={
	  draw,
	  inner sep=2pt,
	  font=\Large,
	  join = by -latex
	},
	start chain=2,node distance=13mm
	]
	\node[on chain=2] 
	  (x2) {$x_2$};
	\node[on chain=2,join=by o-latex] 
	  {$w_2$};
	\node[on chain=2,init] (sigma) 
	  {$\displaystyle\Sigma$};
	\node[on chain=2,squa,label=above:{\parbox{2cm}{\centering Activate \\ function}}]   
	  {$f$};
	\node[on chain=2,label=above:Output,join=by -latex] 
	  {$y$};
	\begin{scope}[start chain=1]
	\node[on chain=1] at (0,1.5cm) 
	  (x1) {$x_1$};
	\node[on chain=1,join=by o-latex] 
	  (w1) {$w_1$};
	\end{scope}
	\begin{scope}[start chain=3]
	\node[on chain=3] at (0,-1.5cm) 
	  (x3) {$x_3$};
	\node[on chain=3,label=below:Weights,join=by o-latex] 
	  (w3) {$w_3$};
	\end{scope}
	\node[label=above:\parbox{2cm}{\centering Bias \\ $b$}] at (sigma|-w1) (b) {};
	
	\draw[-latex] (w1) -- (sigma);
	\draw[-latex] (w3) -- (sigma);
	\draw[o-latex] (b) -- (sigma);
	
	\draw[decorate,decoration={brace,mirror}] (x1.north west) -- node[left=10pt] {Inputs} (x3.south west);
\end{tikzpicture}

\end{document}

nn-2h_manual_net-color+neuralnet+set+foreach.tex

\documentclass{standalone}
\usepackage[usenames,dvipsnames]{xcolor}
\usepackage{tikz}
\usetikzlibrary{calc}
\usetikzlibrary{arrows}
\begin{document}
\begin{tikzpicture}
  %%Create a style for the arrows we are using
  \tikzset{normal arrow/.style={draw,-triangle 45,very thick}}
  %%Create the different coordinates to place the nodes
  \path (0,0) coordinate (1) ++(0,-2) coordinate (2) ++(0,-2) coordinate (3);
  \path (1) ++(-3,-.2) coordinate (x1);
  \path (3) ++(-3, .2) coordinate (x2);
  %%Use the calc library and partway modifiers to generate the second and third level points
  \path ($(1)!.5!(2)!3 cm!90:(2)$) coordinate (4);
  \path ($(2)!.5!(3)!3 cm!90:(3)$) coordinate (5);
  \path ($(4)!.5!(5)!3 cm!90:(5)$) coordinate (6);
  \path (6) ++(3,0) coordinate (7);
  %%Place nodes at each point using the foreach construct
  \foreach \i/\color in {1/Magenta!60,2/MidnightBlue!60,3/CadetBlue!80,4/CadetBlue!80,5/CadetBlue!80,6/CadetBlue!80}{
    \node[draw,circle,shading=axis,top color=\color, bottom color=\color!black,shading angle=45] (n\i) at (\i) {$f_{\i}(e)$};
  }
  %%Place the remaining nodes separately
  \node (nx1) at (x1) {$\mathbf{x_1}$};
  \node (nx2) at (x2) {$\mathbf{x_2}$};
  \node (ny)  at (7)  {$\mathbf{y}$};
  %%Drawing the arrows
  \path[normal arrow] (nx1) -- (n1);
  \path[normal arrow] (nx1) -- (n3);
  \path[normal arrow] (nx2) -- (n1);
  \path[normal arrow] (nx2) -- (n3);
  \path[normal arrow] (n1)  -- (n4);
  \path[normal arrow] (n1)  -- (n5);
  \path[normal arrow] (n2)  -- (n4);
  \path[normal arrow] (n2)  -- (n5);
  \path[normal arrow] (n3)  -- (n4);
  \path[normal arrow] (n3)  -- (n5);
  \path[normal arrow] (n4)  -- (n6);
  \path[normal arrow] (n5)  -- (n6);
  \path[normal arrow] (n6)  -- (ny);
  %%Drawing the cyan arrows including the labels
  \path[normal arrow,Cyan] (nx1) -- node[above=.5em,Cyan] {$\mathbf{w_{(x1)2}}$} (n2);
  \path[normal arrow,Cyan] (nx2) -- node[below=.5em,Cyan] {$\mathbf{w_{(x2)2}}$} (n2);
\end{tikzpicture}
\end{document}

nn-a3c_manual_net_arr+neuralnet.tex

% https://raw.githubusercontent.com/PetarV-/TikZ/master/A3C%20neural%20network/a3c_neural_network.tex
\documentclass[crop, tikz]{standalone}
\usepackage{tikz}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{xcolor}

\usetikzlibrary{positioning, decorations.pathmorphing}

\definecolor{olivegreen}{rgb}{0,0.6,0}

\begin{document}
\begin{tikzpicture}

	% boxes
	\path[rounded corners, fill=blue, fill opacity=0.2] (-0.4, 3.5) --  (-0.4, -3.5) -- (4, -3.5) -- (4, -0.2) -- (5, -0.2) -- (5, 3.5) -- (-0.4, 3.5) -- (-0.4, 0);
	\path[rounded corners, fill=red, fill opacity=0.2] (-0.4, -3.5) --  (-0.4, 3.5) -- (4, 3.5) -- (4, -0.2) -- (5, -0.2) -- (5, -3.5) -- (-0.4, -3.5) -- (-0.4, 0);
	\path[rounded corners, fill=white] (-0.4, 0) -- (-0.4, -3.5) -- (4, -3.5) -- (4, 3.5) -- (-0.4, 3.5) -- (-0.4, 0);
	\path[rounded corners, fill=olivegreen, fill opacity=0.2] (-0.4, 0) -- (-0.4, -3.5) -- (4, -3.5) -- (4, 3.5) -- (-0.4, 3.5) -- (-0.4, 0);
	\path [draw, dashed, very thick, rectangle, rounded corners] (-0.4, 0) -- (-0.4, -3.5) -- (5, -3.5) -- (5, 3.5) -- (-0.4, 3.5) -- (-0.4, 0);
	
	% add input nodes
	\node[circle, thick, fill=white, draw] (x1) {};
	\node[circle, thick, draw, fill=white, below=1em of x1] (x2) {};
	\node[circle, thick, fill=white, draw, below=1em of x2] (x3) {};
	\node[circle, thick, fill=white, draw, below=1em of x3] (x4) {};
	\node[circle, thick, fill=white, draw, below=1em of x4] (x5) {};
	\node[circle, thick, fill=white, draw, above=1em of x1] (x6) {};
	\node[circle, thick, fill=white, draw, above=1em of x6] (x7) {};
	\node[circle, thick, fill=white, draw, above=1em of x7] (x8) {};
	\node[circle, thick, fill=white, draw, above=1em of x8] (x9) {};

	% add 2nd layer
	\node[circle, thick, right=4em of x1, fill=white, draw] (xhh1) {};
	\node[circle, thick, draw, fill=white, below=1em of xhh1] (xhh2) {};
	\node[circle, thick, fill=white, draw, below=1em of xhh2] (xhh3) {};
	\node[circle, thick, fill=white, draw, below=1em of xhh3] (xhh4) {};
	\node[circle, thick, fill=white, draw, above=1em of xhh1] (xhh5) {};
	\node[circle, thick, fill=white, draw, above=1em of xhh5] (xhh6) {};
	\node[circle, thick, fill=white, draw, above=1em of xhh6] (xhh7) {};
	
	% 3rd layer
	\node[circle, thick, right=8em of x1, fill=white, draw] (xh1) {};
	\node[circle, thick, draw, fill=white, below=1em of xh1] (xh2) {};
	\node[circle, thick, fill=white, draw, below=1em of xh2] (xh3) {};
	\node[circle, thick, fill=white, draw, below=1em of xh3] (xh4) {};
	\node[circle, thick, fill=white, draw, above=1em of xh1] (xh5) {};
	\node[circle, thick, fill=white, draw, above=1em of xh5] (xh6) {};
	\node[circle, thick, fill=white, draw, above=1em of xh6] (xh7) {};

	% output layer
	\node[circle, very thick, fill=blue!30, draw, right=12em of x1, yshift=5em] (hm1) {};
	\node[circle, very thick, draw, fill=blue!30, below=0.5em of hm1] (hm2) {};
	\node[circle, very thick, draw, fill=blue!30, below=0.5em of hm2] (hm3) {};
	\node[circle, very thick, draw, fill=blue!30, above=0.5em of hm1] (hm4) {};
	\node[circle, very thick, draw, fill=blue!30, above=0.5em of hm4] (hm5) {};
	\node[circle, very thick, fill=red!30, draw, right=12em of x1, yshift=-5em] (hs1) {};

	% add labels for output layer
	\node[right=1.5em of hm1, blue] (mu1) {$\pi_\theta(s, \alpha_3)$};
	\node[right=1.5em of hm2, blue] (mu2) {$\pi_\theta(s, \alpha_4)$};
	\node[right=1.5em of hm3, blue] (mu3) {$\pi_\theta(s, \alpha_5)$};
	\node[right=1.5em of hm4, blue] (mu4) {$\pi_\theta(s, \alpha_2)$};
	\node[right=1.5em of hm5, blue] (mu5) {$\pi_\theta(s, \alpha_1)$};
	\node[right=1.5em of hs1, red] (s1) {$V_\psi(s)$};

	% arrows between input layer and 2nd layer
	\foreach \x in {1,...,9}
	\foreach \y in {1,...,7}
	\draw[-stealth, thick] (x\x) -- (xhh\y);

	% arrows between 2nd layer and 3rd layer
	\foreach \x in {1,...,7}
	\foreach \y in {1,...,7}
	\draw[-stealth, thick] (xhh\x) -- (xh\y);
	
	% arrows between 3rd layer and upper output layer
	\foreach \x in {1,...,7}
	\foreach \y in {1,...,5}
	\draw[-stealth, thick, blue] (xh\x) -- (hm\y);
	
	% arrows between 3rd layer and lower output layer
	\foreach \x in {1,...,7}
	\draw[-stealth, thick, red] (xh\x) -- (hs1);
	
	% decorated arrows for main output variable
	\draw[-stealth, decoration={snake, pre length=0.01mm, segment length=2mm, amplitude=0.3mm, post length=1.5mm}, decorate, thick, red] (hs1) -- (s1);
	
	% decorated arrows between upper output nodes and labels
	\foreach \x in {1,...,5}
	\draw[-stealth, decoration={snake, pre length=0.01mm, segment length=2mm, amplitude=0.3mm, post length=1.5mm}, decorate, thick, blue] (hm\x) -- (mu\x);

	% label for the whole network
	\node[left=0.75em of x1] (l1) {$s$};

\end{tikzpicture}
\end{document}

nn-auto_net_4h_arr+neuralnet+matrix+foreach+style+scope.tex

% https://tex.stackexchange.com/a/371474/173708
\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{matrix,arrows.meta,quotes,shadows,decorations.pathreplacing,positioning,fadings}
\usepackage{cfr-lm}
\begin{document}
\colorlet{mewnol}{blue!75!cyan}%
\colorlet{allanol}{blue!50!black}%
\begin{tikzpicture}
  [
    lliw nn/.code={\colorlet{lliwnn}{#1}},
    lliw nn=mewnol,
    nn/.style={draw=lliwnn, inner color=white, outer color=lliwnn!5, circular drop shadow},
    font=\sffamily\plstyle,
    >=Latex,
    every edge/.append style={->},
    every edge quotes/.append style={font=\sffamily\plstyle\footnotesize,},
    semithick,
  ]
  \matrix (n) [matrix of nodes, nodes={circle, minimum size=20pt, thick}, nodes in empty cells, column sep=7.5mm, column 1/.append style={nodes={coordinate}}, column 12/.append style={nodes={coordinate}}, column 2/.append style={lliw nn=allanol}, column 11/.append style={lliw nn=allanol}]
  {
    &[10mm]&&|[nn]|&&|[nn]|&&|[nn]|&&&&[10mm]\\
    &&|[nn]|&&|[nn]|&&|[nn]|&&|[nn]|&&&\\
    &|[nn]|&&|[nn]|&&|[nn]|&&|[nn]|&&|[nn]|&&\\
    &&|[nn]|&&|[nn]|&&|[nn]|&&|[nn]|&&|[nn]|&\\
    &|[nn]|&&|[nn]|&&|[nn]|&&|[nn]|&&|[nn]|&&\\
    &&|[nn]|&&|[nn]|&&|[nn]|&&|[nn]|&&|[nn]|&\\
    &|[nn]|&&|[nn]|&&|[nn]|&&|[nn]|&&|[nn]|&&\\
    &&|[nn]|&&|[nn]|&&|[nn]|&&|[nn]|&&&\\
    &&&|[nn]|&&|[nn]|&&|[nn]|&&&&\\
  };

	% draw all nodes; 
	% add labels for input and output layers 
	\foreach \i [count=\j from 1] in {3,5,7} \draw [allanol]  (n-\i-1) edge ["Input \j"] (n-\i-2) ;
	\foreach \i [count=\j from 1] in {4,6} \draw [allanol] (n-\i-11) edge ["Output \j"] (n-\i-12)  ;
  
	% add connections between all nodes  
  \begin{scope}[every edge/.append style={draw=mewnol, opacity={random(25,100)/100}}]
	\foreach \i in {3,5,7} \draw (n-\i-10) edge (n-4-11) edge (n-6-11);
	\foreach \i in {3,5,7} \foreach \j in {2,4,6,8} \draw (n-\i-2) edge (n-\j-3) (n-\j-9) edge (n-\i-10);
	\foreach \k [evaluate=\k as \m using {int(\k+1)}, evaluate=\k as \n using {int(\k+2)} ] in {3,5,7} \foreach \i in {2,4,6,8} \foreach \j in {1,3,5,7,9} \draw  (n-\i-\k) edge (n-\j-\m) (n-\j-\m) edge (n-\i-\n) ;
  \end{scope}

	% add decorations
	% add layers for groups: input layer, hidden layers, output layer  
	\begin{scope}[decoration={brace, amplitude=7.5pt}, thick, every node/.append style={align=center}]
	 \draw [decorate, mewnol] ([xshift=-2.5pt]n-1-3.west |- n-1-3.north) ++(0,7.5pt) coordinate (l) -- ([xshift=2.5pt]n-1-10.east |- l) node [above=7.5pt,midway] {Hidden\\Layers};
	 \draw [decorate, allanol] ([xshift=-2.5pt]n-1-2.west |- l) -- ([xshift=2.5pt]n-1-2.east |- l) node [above=7.5pt,midway]  {Input\\Layer};
	 \draw [decorate, allanol] ([xshift=-2.5pt]n-1-11.west |- l) -- ([xshift=2.5pt]n-1-11.east |- l) node [above=7.5pt,midway]  {Output\\Layer};
  \end{scope}
  
  % add x-axis arrow and label
  \draw [thick, ->, allanol] ([xshift=-2.5pt,yshift=-10pt]current bounding box.south -| n-9-2.west) coordinate (ll) -- ([xshift=2.5pt]n-9-11.east |- ll) node [midway, below] {Flow of Information};
  
  % add legend and strength
  \node (cs) [every edge quotes, anchor=base west, xshift=50mm, mewnol] at ([xshift=5pt,yshift=-12.5pt]n-1-1 |- current bounding box.south) {Connection Strength};
  \fill [fill=mewnol, path fading=west] (cs.base west) ++(-5pt,\pgflinewidth) rectangle ++(-50mm,5pt) ;
  
\end{tikzpicture}
\end{document}

nn-auto_net_arr+neuralnet+foreach+style+foreach.tex

\documentclass{standalone}

\usepackage{tikz}
\usepackage{verbatim}

% Basis: http://www.texample.net/tikz/examples/neural-network/
\begin{document}
\pagestyle{empty}

\def\layersep{2.5cm}

\begin{tikzpicture}[shorten >=1pt,->,draw=black!100, node distance=\layersep]
    \tikzstyle{every pin edge}=[<-,shorten <=1pt]
    \tikzstyle{neuron}=[circle,fill=black!25,minimum size=17pt,inner sep=0pt]
    \tikzstyle{input neuron}=[neuron, fill=white!100,draw=black];
    \tikzstyle{output neuron}=[neuron, fill=white!100,draw=black];
    \tikzstyle{hidden neuron}=[neuron, fill=white!100,draw=black];
    \tikzstyle{annot} = [text width=4em, text centered]

	% Draw the input layer nodes and the labels
	\foreach \name / \y in {1,...,3}
		% This is the same as writing \foreach \name / \y in {1/1,2/2,3/3,4/4}
		\node[input neuron, pin=left:Input \y] (I-\name) at (0,-\y) {};
	
	% Draw the hidden layer nodes
	\foreach \name / \y in {1,...,4}
	    \path[yshift=0.5cm]
	        node[hidden neuron] (H-\name) at (\layersep,-\y cm) {};
	
	% Draw the output layer node
	\node[output neuron,pin={[pin edge={->}]right:Output}, right of=H-2] (O1) {};
	\node[output neuron,pin={[pin edge={->}]right:Output}, right of=H-3] (O2) {};
	
	% Connect every node in the input layer with every node in the
	% hidden layer.
	\foreach \source in {1,...,3}
	    \foreach \dest in {1,...,4}
	        \path (I-\source) edge (H-\dest);
	
	% Connect every node in the hidden layer with the output layer
	\foreach \source in {1,...,4}
	    \path (H-\source) edge (O1);
	\foreach \source in {1,...,4}
	    \path (H-\source) edge (O2);
	
	% Annotate the layers at the top
	\node[annot,above of=H-1, node distance=1cm] (hl) {Hidden layer};
	\node[annot,left of=hl] {Input layer};
	\node[annot,right of=hl] {Output layer};

\end{tikzpicture}
% End of code
\end{document}

nn-auto_net_bias_arr+neuralnet+learn+foreach+def+command+ifnum+style.tex

\documentclass{standalone}
\usepackage{tikz}
\begin{document}
\pagestyle{empty}

\def\layersep{3cm}
\def\nodeinlayersep{1.5cm}

\begin{tikzpicture}
  [
    shorten >=1pt,->,
    draw=black!50,
    node distance=\layersep,
    every pin edge/.style={<-,shorten <=1pt},
    neuron/.style={circle,fill=black!25,minimum size=17pt,inner sep=0pt},
    input neuron/.style={neuron, fill=green!50,},
    output neuron/.style={neuron, fill=red!50},
    hidden neuron/.style={neuron, fill=blue!50},
    annot/.style={text width=4em, text centered},
    bias/.style={neuron, fill=yellow!50,minimum size=4em},%<-- added %%%
  ]

  % Draw the input layer nodes
  \foreach \name / \y in {1,...,3}
    \node[input neuron, pin=left:Input \#\y] (I-\name) at (0,-\y-2.5) {};  

  % set number of hidden layers
  \newcommand\Nhidden{2}

  % Draw the hidden layer nodes
  \foreach \N in {0,...,\Nhidden} {
      \foreach \y in {0,...,5} { % <-- added 0 instead of 1 %%%%%
      \ifnum \y=4
      \ifnum \N>0 %<-- added %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
        \node at (\N*\layersep,-\y*\nodeinlayersep) {$\vdots$};  % add dots
        \else\fi %<-- added %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
      \else
          \ifnum \y=0 %<-- added %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
          \ifnum \N<3 %<-- added %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
            \node[bias] (H\N-\y) at (\N*\layersep,-\y*\nodeinlayersep ) {Bias}; %<-- added
            \else\fi %<-- added %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
          \else %<-- added %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
            \ifnum \N>0 %<-- added %%%%%%%%%%%%%%%%%%%%%%%%%
            % print function
            \node[hidden neuron] (H\N-\y) at (\N*\layersep,-\y*\nodeinlayersep ) {$\frac{1}{1+e^{-x}}$}; %<-- added %%%%%%%%%%%
                \else\fi %<-- added %%%%%%%%%%%%
          \fi %<-- added %%%%%%%
      \fi
    }
      \ifnum \N>0 %<-- added %%%%%%
      % print hidden layer labels at the top
    \node[annot,above of=H\N-1, node distance=1cm,yshift=2cm] (hl\N) {Hidden layer \N}; % <- added yshift=2cm %%%%%%%%%%%%
    \else\fi %<-- added %%%%%
  }

  % Draw the output layer node and label
  \node[output neuron,pin={[pin edge={->}]right:Output}, right of=H\Nhidden-3] (O) {}; 
  
  % Connect bias every node in the input layer with every node in the
  % hidden layer.
  \foreach \source in {1,...,3}
      \foreach \dest in {1,...,3,5} {
        % \path[yellow] (H-0) edge (H1-\dest);
        \path[dashed,orange] (H0-0) edge (H1-\dest); %<-- added %%%%%
          \path[green!50] (I-\source) edge (H1-\dest);  % change to green, yellow gets blended
    };

  % connect all hidden stuff
  \foreach [remember=\N as \lastN (initially 1)] \N in {2,...,\Nhidden}
      \foreach \source in {0,...,3,5} 
          \foreach \dest in {1,...,3,5}{
              \ifnum \source=0 %<-- added %%%%%%%%%%%%%%%%%%%%%%%
          \path[dashed,red](H\lastN-\source) edge (H\N-\dest);%<-- added 
            \else %<-- added %%%
            \path[blue!50] (H\lastN-\source) edge (H\N-\dest);%<-- added 
            \fi %<-- added %%%
            }; %<-- added %%%%


  % Connect every node in the hidden layer with the output layer
  \foreach \source in {1,...,3,5}
    \path[green!50] (H\Nhidden-\source) edge (O);
    \path[dashed,red] (H2-0) edge (O); %<-- added %%%%

% Annotate the input and output layers
  \node[annot,left of=hl1] {Input layer};
  \node[annot,right of=hl\Nhidden] {Output layer};  
\end{tikzpicture}
% End of code
\end{document}

nn-auto_net_color+neuralnet+foreach.tex

\documentclass[border=1cm]{standalone}

\usepackage{tikz}
\usepackage{xcolor}

\begin{document}
\begin{tikzpicture}
    \foreach \x /\alph/\name in {0/a/one, 60/b/two, 120/c/three, 180/d/four, 240/e/five, 300/f/six}{
    \node[circle, fill=green,minimum width=15mm,draw,shading=axis,top color=green, bottom color=green!50!black] (\alph) at (\x:3cm) {\name}; }

    \foreach \alpha in {a,b,c,d,e,f}%
    {%
    \foreach \alphb in {a,b,c,d,e}%
    {%
    \draw (\alpha) -- (\alphb);%
    }}
 \end{tikzpicture}


\end{document}

nn-auto_net_icon+neuralnet+style+foreach+set+function+learn.tex

% https://tex.stackexchange.com/questions/446948/how-to-place-a-parabola-distribution-on-top-of-a-node-in-tikz?rq=1
\documentclass[tikz,margin=2mm]{standalone}

\usepackage{tikz}

\tikzset{
    declare function={
        sig = 0.1;
        mu = 0;
        g(\x) = 1/(sig*sqrt(2*pi)) * exp(-1/2 * ((\x-mu)/sig)^2);
    }
}

\begin{document}

\begin{tikzpicture}[
    shorten >=1pt,
    ->,
    draw=black!50,
    node distance=2.5cm,
    scale=1.5,
    every pin edge/.style={<-,shorten <=1pt},
    neuron/.style={
        circle,fill=black!25,minimum size=17pt,inner sep=0pt,
        path picture={
            \draw[red,thick,-] plot[domain=-0.3:0.3,samples=11,smooth] ({\x},{0.05*g(\x)});
        },
    },
    input neuron/.style={neuron, fill=green!50},
    output neuron/.style={neuron, fill=red!50},
    hidden neuron/.style={neuron, fill=blue!50},
    annot/.style={text width=4em, text centered},
]

	% Draw the input layer nodes
	\foreach \name / \y in {1,...,4}
	% This is the same as writing \foreach \name / \y in {1/1,2/2,3/3,4/4}
	    \node[input neuron, pin=left:Input \y] (I-\name) at (0,-\y) {};
	
	% Draw the hidden layer nodes
	\foreach \name / \y in {1,...,5}
	    \path[yshift=0.5cm]
	        node[hidden neuron] (H-\name) at (2.5cm,-\y cm) {};
	
	% Draw the output layer node
	\node[output neuron,pin={[pin edge={->}]right:Output}, right of=H-3] (O) {};
	
	% Connect every node in the input layer with every node in the
	% hidden layer.
	\foreach \source in {1,...,4}
	    \foreach \dest in {1,...,5}
	        \path (I-\source) edge (H-\dest);
	
	% Connect every node in the hidden layer with the output layer
	\foreach \source in {1,...,5}
	    \path (H-\source) edge (O);
	
	% Annotate the layers
	\node[annot,above of=H-1, node distance=1cm] (hl) {Hidden layer};
	\node[annot,above of=I-1, node distance=1cm] {Input layer};
	\node[annot,above of=O] {Output layer};


\end{tikzpicture}

\end{document}

nn-block_diagram-multilayer_perceptron+neuralnet+style+learn.tex

\documentclass[crop, tikz]{standalone}
\usepackage{tikz}

\usetikzlibrary{positioning}

\tikzstyle{inputNode}=[draw,circle,minimum size=10pt,inner sep=0pt]
\tikzstyle{stateTransition}=[-stealth, thick]

\begin{document}
\begin{tikzpicture}
	\node[draw,circle,minimum size=25pt,inner sep=0pt] (x) at (0,0) {$\Sigma$ $\sigma$};

	\node[inputNode] (x0) at (-2, 1.5) {$\tiny +1$};
	\node[inputNode] (x1) at (-2, 0.75) {$\tiny x_1$};
	\node[inputNode] (x2) at (-2, 0) {$\tiny x_2$};
	\node[inputNode] (x3) at (-2, -0.75) {$\tiny x_3$};
	\node[inputNode] (xn) at (-2, -1.75) {$\tiny x_n$};

	\draw[stateTransition] (x0) to[out=0,in=120] node [midway, sloped, above] {$w_0$} (x);
	\draw[stateTransition] (x1) to[out=0,in=150] node [midway, sloped, above] {$w_1$} (x);
	\draw[stateTransition] (x2) to[out=0,in=180] node [midway, sloped, above] {$w_2$} (x);
	\draw[stateTransition] (x3) to[out=0,in=210] node [midway, sloped, above] {$w_3$} (x);
	\draw[stateTransition] (xn) to[out=0,in=240] node [midway, sloped, above] {$w_n$} (x);
	\draw[stateTransition] (x) -- (4,0) node [midway,above] {$\sigma\left(w_0 + \sum\limits_{i=1}^{n}{w_ix_i}\right)$};
	\draw[dashed] (0,-0.43) -- (0,0.43);
	\node (dots) at (-2, -1.15) {$\vdots$};
	\node[inputNode, thick] (i1) at (6, 0.75) {};
	\node[inputNode, thick] (i2) at (6, 0) {};
	\node[inputNode, thick] (i3) at (6, -0.75) {};
	
	\node[inputNode, thick] (h1) at (8, 1.5) {};
	\node[inputNode, thick] (h2) at (8, 0.75) {};
	\node[inputNode, thick] (h3) at (8, 0) {};
	\node[inputNode, thick] (h4) at (8, -0.75) {};
	\node[inputNode, thick] (h5) at (8, -1.5) {};
	
	\node[inputNode, thick] (o1) at (10, 0.75) {};
	\node[inputNode, thick] (o2) at (10, -0.75) {};
	
	\draw[stateTransition] (5, 0.75) -- node[above] {$I_1$} (i1);
	\draw[stateTransition] (5, 0) -- node[above] {$I_2$} (i2);
	\draw[stateTransition] (5, -0.75) -- node[above] {$I_3$} (i3);
	
	\draw[stateTransition] (i1) -- (h1);
	\draw[stateTransition] (i1) -- (h2);
	\draw[stateTransition] (i1) -- (h3);
	\draw[stateTransition] (i1) -- (h4);
	\draw[stateTransition] (i1) -- (h5);
	\draw[stateTransition] (i2) -- (h1);
	\draw[stateTransition] (i2) -- (h2);
	\draw[stateTransition] (i2) -- (h3);
	\draw[stateTransition] (i2) -- (h4);
	\draw[stateTransition] (i2) -- (h5);
	\draw[stateTransition] (i3) -- (h1);
	\draw[stateTransition] (i3) -- (h2);
	\draw[stateTransition] (i3) -- (h3);
	\draw[stateTransition] (i3) -- (h4);
	\draw[stateTransition] (i3) -- (h5);
	
	\draw[stateTransition] (h1) -- (o1);
	\draw[stateTransition] (h1) -- (o2);
	\draw[stateTransition] (h2) -- (o1);
	\draw[stateTransition] (h2) -- (o2);
	\draw[stateTransition] (h3) -- (o1);
	\draw[stateTransition] (h3) -- (o2);
	\draw[stateTransition] (h4) -- (o1);
	\draw[stateTransition] (h4) -- (o2);
	\draw[stateTransition] (h5) -- (o1);
	\draw[stateTransition] (h5) -- (o2);
	
	\node[above=of i1, align=center] (l1) {Input \\ layer};
	\node[right=2.3em of l1, align=center] (l2) {Hidden \\ layer};
	\node[right=2.3em of l2, align=center] (l3) {Output \\ layer};
	
	\draw[stateTransition] (o1) -- node[above] {$O_1$} (11, 0.75);
	\draw[stateTransition] (o2) -- node[above] {$O_2$} (11, -0.75);
	
	\path[dashed, double, ultra thick, gray] (x.north) edge[bend left=0] (h5.north);
	\path[dashed, double, ultra thick, gray] (x.south) edge[bend right=0] (h5.south);
\end{tikzpicture}
\end{document}

nn-block_diagram-perceptron+neuralnet+set+learn.tex

\documentclass[tikz]{standalone}
\usepackage{tikz}
    \usetikzlibrary{positioning}

\tikzset{basic/.style={draw,fill=blue!20,text width=1em,text badly centered}}
\tikzset{input/.style={basic,circle}}
\tikzset{weights/.style={basic,rectangle}}
\tikzset{functions/.style={basic,circle,fill=blue!10}}

\begin{document}
\begin{tikzpicture}
    \node[functions] (center) {};
    \node[below of=center,font=\scriptsize,text width=4em] {Activation function};
    \draw[thick] (0.5em,0.5em) -- (0,0.5em) -- (0,-0.5em) -- (-0.5em,-0.5em);
    \draw (0em,0.75em) -- (0em,-0.75em);
    \draw (0.75em,0em) -- (-0.75em,0em);
    \node[right of=center] (right) {};
        \path[draw,->] (center) -- (right);
    \node[functions,left=3em of center] (left) {$\sum$};
        \path[draw,->] (left) -- (center);
    \node[weights,left=3em of left] (2) {$w_2$} -- (2) node[input,left of=2] (l2) {$x_2$};
        \path[draw,->] (l2) -- (2);
        \path[draw,->] (2) -- (left);
    \node[below of=2] (dots) {$\vdots$} -- (dots) node[left of=dots] (ldots) {$\vdots$};
    \node[weights,below of=dots] (n) {$w_n$} -- (n) node[input,left of=n] (ln) {$x_n$};
        \path[draw,->] (ln) -- (n);
        \path[draw,->] (n) -- (left);
    \node[weights,above of=2] (1) {$w_1$} -- (1) node[input,left of=1] (l1) {$x_1$};
        \path[draw,->] (l1) -- (1);
        \path[draw,->] (1) -- (left);
    \node[weights,above of=1] (0) {$w_0$} -- (0) node[input,left of=0] (l0) {$1$};
        \path[draw,->] (l0) -- (0);
        \path[draw,->] (0) -- (left);
    \node[below of=ln,font=\scriptsize] {inputs};
    \node[below of=n,font=\scriptsize] {weights};
\end{tikzpicture}
\end{document}

nn-discriminator+neuralnet+matrix+foreach+style.tex

\documentclass[landscape]{article}
\usepackage{tikz}

%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>

\usepackage[margin=1cm]{geometry}
\usepackage{tikz,pgfplots,pgf}
\usetikzlibrary{matrix,shapes,arrows,positioning}

\begin{document}

\begin{figure}[htp]
\centering
\begin{tikzpicture}[
	plain/.style={
	  draw=none,
	  fill=none,
	  },
	dot/.style={draw,shape=circle,minimum size=3pt,inner sep=0,fill=black
	  },
	net/.style={
	  matrix of nodes,
	  nodes={
	    draw,
	    circle,
	    inner sep=8.5pt
	    },
	  nodes in empty cells,
	  column sep=0.6cm,
	  row sep=-11pt
	  },
	>=latex
	]
	\matrix[net] (mat)
	{
	|[plain]| \parbox{1cm}{\centering Input\\layer} 
	          & |[plain]| \parbox{1cm}{\centering Hidden\\layer} 
	                       & |[plain]| \parbox{1cm}{\centering Output\\layer} \\
	          & |[plain]|                 \\
	|[plain]| &                 \\
	          & |[plain]|                \\
	|[plain]| & |[dot]|                        \\
	          & |[plain]|         \\
	|[plain]| & |[dot]|    &  |[plain]|      \\
	|[dot]|   & |[plain]|  &      \\
	|[dot]|   & |[dot]|         \\
	|[dot]|   & |[plain]|                \\
	|[plain]| &                 \\
	          & |[plain]|                 \\
	};
	\foreach \ai/\mi in {2/Var1,4/Var2,6/Var3,12/Varn}
	  \draw[<-] (mat-\ai-1) -- node[above] {\mi} +(-2cm,0);
	
	\foreach \ai in {2,4,6,12} {
	  \foreach \aii/\mii in {3/H1,11/Hn}
	    \draw[->] (mat-\ai-1) -- (mat-\aii-2) node[yshift=0.6cm] {\mii};
	}
	% output layer
	\foreach \ai in {3,11}
	{  \draw[->] (mat-\ai-2) -- (mat-8-3);
	   \draw[->] (mat-8-3) -- node[above] {Real vs Fake} +(2.5cm,0);}
	% output layer
\end{tikzpicture}

\caption{ANN diagram for the Discriminator}
\label{fig_m_3}
\end{figure}

\end{document}

nn-gan_complete+neuralnet.tex

\documentclass[border=10pt]{standalone}
\usepackage{tikz}

\begin{document}
% Gradient Info
  
\tikzset {_zurc7u6zg/.code = {\pgfsetadditionalshadetransform{ \pgftransformshift{\pgfpoint{0 bp } { 0 bp }  }  \pgftransformrotate{0 }  \pgftransformscale{2 }  }}}
\pgfdeclarehorizontalshading{_9951a9ewz}{150bp}{rgb(0bp)=(1,1,1);
rgb(37.5bp)=(1,1,1);
rgb(62.5bp)=(0,0,0);
rgb(100bp)=(0,0,0)}
\tikzset{_26b0l72gl/.code = {\pgfsetadditionalshadetransform{\pgftransformshift{\pgfpoint{0 bp } { 0 bp }  }  \pgftransformrotate{0 }  \pgftransformscale{2 } }}}
\pgfdeclarehorizontalshading{_cfa2kfymd} {150bp} {color(0bp)=(transparent!0);
color(37.5bp)=(transparent!0);
color(62.5bp)=(transparent!10);
color(100bp)=(transparent!10) } 
\pgfdeclarefading{_pe8x93w4q}{\tikz \fill[shading=_cfa2kfymd,_26b0l72gl] (0,0) rectangle (50bp,50bp); } 

% Gradient Info
  
\tikzset {_dat12uray/.code = {\pgfsetadditionalshadetransform{ \pgftransformshift{\pgfpoint{0 bp } { 0 bp }  }  \pgftransformrotate{0 }  \pgftransformscale{2 }  }}}
\pgfdeclarehorizontalshading{_w05td983g}{150bp}{rgb(0bp)=(0.65,0.81,0.87);
rgb(37.5bp)=(0.65,0.81,0.87);
rgb(62.5bp)=(0.14,0.33,0.54);
rgb(100bp)=(0.14,0.33,0.54)}
\tikzset{every picture/.style={line width=0.75pt}} %set default line width to 0.75pt        

\begin{tikzpicture}[x=0.75pt,y=0.75pt,yscale=-1,xscale=1]
    %uncomment if require: \path (0,386.25); %set diagram left start at 0, and has height of 386.25

    %Rounded Rect [id:dp5600381410432633] 
    \draw   (369,181) .. controls (369,171.06) and (377.06,163) .. (387,163) -- (441,163) .. controls (450.94,163) and (459,171.06) .. (459,181) -- (459,235) .. controls (459,244.94) and (450.94,253) .. (441,253) -- (387,253) .. controls (377.06,253) and (369,244.94) .. (369,235) -- cycle ;
    %Shape: Circle [id:dp5032925255170694] 
    \draw  [color={rgb, 255:red, 74; green, 144; blue, 226 }  ,draw opacity=1 ][line width=1.5]  (398.28,193.22) .. controls (398.28,183.4) and (406.24,175.44) .. (416.06,175.44) .. controls (425.87,175.44) and (433.83,183.4) .. (433.83,193.22) .. controls (433.83,203.04) and (425.87,211) .. (416.06,211) .. controls (406.24,211) and (398.28,203.04) .. (398.28,193.22) -- cycle ;

    %Straight Lines [id:da8271448645768573] 
    \draw    (347.44,207) -- (367,207) ;
    \draw [shift={(369,207)}, rotate = 180] [color={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=0.75]    (10.93,-3.29) .. controls (6.95,-1.4) and (3.31,-0.3) .. (0,0) .. controls (3.31,0.3) and (6.95,1.4) .. (10.93,3.29)   ;

    %Shape: Rectangle [id:dp9964191526976391] 
    \draw  [fill={rgb, 255:red, 74; green, 144; blue, 226 }  ,fill opacity=0.34 ] (14.82,192.37) -- (33.46,192.37) -- (33.46,210.6) -- (14.82,210.6) -- cycle ;
    %Shape: Rectangle [id:dp3482140555452191] 
    \draw  [fill={rgb, 255:red, 155; green, 155; blue, 155 }  ,fill opacity=0.56 ] (14.82,210.6) -- (33.46,210.6) -- (33.46,228.83) -- (14.82,228.83) -- cycle ;
    %Shape: Rectangle [id:dp654940367376203] 
    \draw  [fill={rgb, 255:red, 184; green, 233; blue, 134 }  ,fill opacity=1 ] (14.82,228.83) -- (33.46,228.83) -- (33.46,247.05) -- (14.82,247.05) -- cycle ;
    %Shape: Rectangle [id:dp5306238704836159] 
    \draw  [fill={rgb, 255:red, 248; green, 231; blue, 28 }  ,fill opacity=0.63 ] (14.82,247.05) -- (33.46,247.05) -- (33.46,265.28) -- (14.82,265.28) -- cycle ;
    %Shape: Rectangle [id:dp8835706058360098] 
    \path  [shading=_9951a9ewz,_zurc7u6zg,path fading= _pe8x93w4q ,fading transform={xshift=2}] (14.82,283.51) -- (33.46,283.51) -- (33.46,301.74) -- (14.82,301.74) -- cycle ; % for fading 
    \draw   (14.82,283.51) -- (33.46,283.51) -- (33.46,301.74) -- (14.82,301.74) -- cycle ; % for border 

    %Shape: Rectangle [id:dp954891220078887] 
    \path  [shading=_w05td983g,_dat12uray] (14.82,301.74) -- (33.46,301.74) -- (33.46,319.96) -- (14.82,319.96) -- cycle ; % for fading 
    \draw   (14.82,301.74) -- (33.46,301.74) -- (33.46,319.96) -- (14.82,319.96) -- cycle ; % for border 

    %Shape: Rectangle [id:dp7774202257654144] 
    \draw  [fill={rgb, 255:red, 245; green, 166; blue, 35 }  ,fill opacity=1 ] (14.82,319.96) -- (33.46,319.96) -- (33.46,338.19) -- (14.82,338.19) -- cycle ;
    %Shape: Rectangle [id:dp20545652341663612] 
    \draw  [fill={rgb, 255:red, 224; green, 16; blue, 203 }  ,fill opacity=0.6 ] (14.82,265.28) -- (33.46,265.28) -- (33.46,283.51) -- (14.82,283.51) -- cycle ;

    %Shape: Circle [id:dp6187772005236754] 
    \draw  [fill={rgb, 255:red, 0; green, 0; blue, 0 }  ,fill opacity=1 ] (344.43,207) .. controls (344.43,205.4) and (345.73,204.11) .. (347.32,204.11) .. controls (348.92,204.11) and (350.21,205.4) .. (350.21,207) .. controls (350.21,208.6) and (348.92,209.89) .. (347.32,209.89) .. controls (345.73,209.89) and (344.43,208.6) .. (344.43,207) -- cycle ;
    %Image [id:dp846479400101296] 

    \draw    (110,270) -- (141.25,270) ;
    \draw [shift={(143.25,270)}, rotate = 180] [color={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=0.75]    (10.93,-3.29) .. controls (6.95,-1.4) and (3.31,-0.3) .. (0,0) .. controls (3.31,0.3) and (6.95,1.4) .. (10.93,3.29)   ;

    %Straight Lines [id:da3216915680070973] 
    \draw    (301.23,188.38) -- (342.28,206.2) ;
    \draw [shift={(344.11,207)}, rotate = 203.47] [fill={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=0.75]  [draw opacity=0] (10.72,-5.15) -- (0,0) -- (10.72,5.15) -- (7.12,0) -- cycle    ;

    %Straight Lines [id:da9690716199190742] 
    \draw    (269.99,227) -- (296.35,227) ;
    \draw [shift={(298.35,227)}, rotate = 180] [color={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=0.75]    (10.93,-3.29) .. controls (6.95,-1.4) and (3.31,-0.3) .. (0,0) .. controls (3.31,0.3) and (6.95,1.4) .. (10.93,3.29)   ;

    %Straight Lines [id:da9710447872307109] 
    \draw    (270.33,188.55) -- (296.35,188.55) ;
    \draw [shift={(298.35,188.55)}, rotate = 180] [color={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=0.75]    (10.93,-3.29) .. controls (6.95,-1.4) and (3.31,-0.3) .. (0,0) .. controls (3.31,0.3) and (6.95,1.4) .. (10.93,3.29)   ;

    %Shape: Brace [id:dp9505586683559769] 
    \draw   (40.5,339) .. controls (45.17,339) and (47.5,336.67) .. (47.5,332) -- (47.5,278) .. controls (47.5,271.33) and (49.83,268) .. (54.5,268) .. controls (49.83,268) and (47.5,264.67) .. (47.5,258)(47.5,261) -- (47.5,197) .. controls (47.5,192.33) and (45.17,190) .. (40.5,190) ;
    %Shape: Square [id:dp9131980861441146] 
    \draw  [color={rgb, 255:red, 139; green, 87; blue, 42 }  ,draw opacity=1 ][fill={rgb, 255:red, 248; green, 231; blue, 28 }  ,fill opacity=1 ] (163,90) -- (213,90) -- (213,140) -- (163,140) -- cycle ;
    %Shape: Square [id:dp3631151283608858] 
    \draw  [color={rgb, 255:red, 74; green, 144; blue, 226 }  ,draw opacity=1 ][fill={rgb, 255:red, 129; green, 183; blue, 250 }  ,fill opacity=1 ] (168,95) -- (218,95) -- (218,145) -- (168,145) -- cycle ;
    %Shape: Square [id:dp34176399727208884] 
    \draw  [color={rgb, 255:red, 126; green, 211; blue, 33 }  ,draw opacity=1 ][fill={rgb, 255:red, 173; green, 250; blue, 87 }  ,fill opacity=1 ] (173,100) -- (223,100) -- (223,150) -- (173,150) -- cycle ;
    %Shape: Square [id:dp4490513469836446] 
    \draw  [color={rgb, 255:red, 245; green, 166; blue, 35 }  ,draw opacity=1 ][fill={rgb, 255:red, 246; green, 190; blue, 97 }  ,fill opacity=1 ] (178,105) -- (228,105) -- (228,155) -- (178,155) -- cycle ;
    %Shape: Square [id:dp9277635715246153] 
    \draw  [color={rgb, 255:red, 155; green, 155; blue, 155 }  ,draw opacity=1 ][fill={rgb, 255:red, 255; green, 255; blue, 255 }  ,fill opacity=1 ] (183,110) -- (233,110) -- (233,160) -- (183,160) -- cycle ;
    %Shape: Square [id:dp8826163826532741] 
    \draw  [color={rgb, 255:red, 189; green, 16; blue, 224 }  ,draw opacity=1 ][fill={rgb, 255:red, 214; green, 146; blue, 231 }  ,fill opacity=1 ] (188,115) -- (238,115) -- (238,165) -- (188,165) -- cycle ;

    %Shape: Diamond [id:dp4450122661170127] 
    \draw   (552.92,165.5) -- (599.92,208.5) -- (552.92,251.5) -- (505.92,208.5) -- cycle ;
    %Shape: Circle [id:dp3964751670253476] 
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\end{document}

nn-gan_parts+neuralnet.tex

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\end{document}

nn-gan_two_gan_types+neuralnet.tex

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    %Straight Lines [id:da5203121766050092] 
    \draw [line width=1.5]    (366.33,238.5) -- (366.33,219.3) ;
    \draw [shift={(366.33,216.3)}, rotate = 450] [fill={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=1.5]  [draw opacity=0] (11.61,-5.58) -- (0,0) -- (11.61,5.58) -- cycle    ;

    %Straight Lines [id:da937462245399049] 
    \draw [line width=1.5]    (366.33,238.5) -- (366.33,248.5) ;

    %Straight Lines [id:da9479077607901114] 
    \draw    (368.33,238.5) -- (430,238.5) ;

    \draw [shift={(366.33,238.5)}, rotate = 0] [fill={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=0.75]  [draw opacity=0] (10.72,-5.15) -- (0,0) -- (10.72,5.15) -- (7.12,0) -- cycle    ;
    %Straight Lines [id:da5439740708699127] 
    \draw    (318.33,107.98) -- (430,107) ;

    \draw [shift={(316.33,108)}, rotate = 359.5] [fill={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=0.75]  [draw opacity=0] (10.72,-5.15) -- (0,0) -- (10.72,5.15) -- (7.12,0) -- cycle    ;
    %Straight Lines [id:da9106477946558591] 
    \draw [line width=1.5]    (146,238.5) -- (146,219.3) ;
    \draw [shift={(146,216.3)}, rotate = 450] [fill={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=1.5]  [draw opacity=0] (11.61,-5.58) -- (0,0) -- (11.61,5.58) -- cycle    ;

    %Straight Lines [id:da3221761369788204] 
    \draw [line width=1.5]    (146,238.5) -- (146,248.5) ;

    % Text Node
    \draw (146,196.5) node [scale=1.7280000000000002] [align=left] {G};
    % Text Node
    \draw (147,140.5) node   {$G( z)$};
    % Text Node
    \draw (148,258.5) node   {$z$};
    % Text Node
    \draw (94,65.17) node [scale=1.7280000000000002] [align=left] {D};
    % Text Node
    \draw (161.5,118.5) node [scale=0.8,color={rgb, 255:red, 155; green, 155; blue, 155 }  ,opacity=1 ] [align=left] {fake};
    % Text Node
    \draw (32.5,117.5) node [scale=0.8,color={rgb, 255:red, 155; green, 155; blue, 155 }  ,opacity=1 ] [align=left] {real};
    % Text Node
    \draw (47.5,138) node   {$x$};
    % Text Node
    \draw (96,11.83) node  [align=left] {real/fake};
    % Text Node
    \draw (114.17,289) node [scale=0.8] [align=left] {a) Generative Adversarial Networks};
    % Text Node
    \draw (367,141.5) node   {$G( z)$};
    % Text Node
    \draw (381.5,119.5) node [scale=0.8,color={rgb, 255:red, 155; green, 155; blue, 155 }  ,opacity=1 ] [align=left] {fake};
    % Text Node
    \draw (252.5,118.5) node [scale=0.8,color={rgb, 255:red, 155; green, 155; blue, 155 }  ,opacity=1 ] [align=left] {real};
    % Text Node
    \draw (316,12.83) node  [align=left] {real/fake};
    % Text Node
    \draw (354.67,289) node [scale=0.8] [align=left] {b) Conditional GAN};
    % Text Node
    \draw (267.5,139) node   {$x$};
    % Text Node
    \draw (369.5,258.5) node   {$z$};
    % Text Node
    \draw (366,197.5) node [scale=1.7280000000000002] [align=left] {G};
    % Text Node
    \draw (315,64.8) node [scale=1.7280000000000002] [align=left] {D};
    % Text Node
    \draw (432.17,259) node   {$c$};

\end{tikzpicture}



\end{document}

nn-gan_vertical+neuralnet.tex

\documentclass[border=10pt]{standalone}
\usepackage{tikz}

\begin{document}




\tikzset{every picture/.style={line width=0.75pt}} %set default line width to 0.75pt        

\begin{tikzpicture}[x=0.75pt,y=0.75pt,yscale=-1,xscale=1]
    %uncomment if require: \path (0,300); %set diagram left start at 0, and has height of 300

    %Rounded Same Side Corner Rect [id:dp2451362198380881] 
    \draw  [fill={rgb, 255:red, 167; green, 189; blue, 216 }  ,fill opacity=1 ] (79,54.17) .. controls (79,49.75) and (82.58,46.17) .. (87,46.17) -- (141,46.17) .. controls (145.42,46.17) and (149,49.75) .. (149,54.17) -- (149,86.17) .. controls (149,86.17) and (149,86.17) .. (149,86.17) -- (79,86.17) .. controls (79,86.17) and (79,86.17) .. (79,86.17) -- cycle ;

    %Straight Lines [id:da14573772274169616] 
    \draw [line width=1.5]    (114,47.37) -- (114,28.17) ;
    \draw [shift={(114,25.17)}, rotate = 450] [fill={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=1.5]  [draw opacity=0] (11.61,-5.58) -- (0,0) -- (11.61,5.58) -- cycle    ;

    %Straight Lines [id:da7579961352080994] 
    \draw [line width=1.5]    (114,109.37) -- (114,90.17) ;
    \draw [shift={(114,87.17)}, rotate = 450] [fill={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=1.5]  [draw opacity=0] (11.61,-5.58) -- (0,0) -- (11.61,5.58) -- cycle    ;

    %Rounded Same Side Corner Rect [id:dp27437364893503646] 
    \draw  [fill={rgb, 255:red, 236; green, 127; blue, 141 }  ,fill opacity=1 ] (131,185.5) .. controls (131,181.08) and (134.58,177.5) .. (139,177.5) -- (193,177.5) .. controls (197.42,177.5) and (201,181.08) .. (201,185.5) -- (201,217.5) .. controls (201,217.5) and (201,217.5) .. (201,217.5) -- (131,217.5) .. controls (131,217.5) and (131,217.5) .. (131,217.5) -- cycle ;

    %Shape: Circle [id:dp6172800122901183] 
    \draw   (153.5,261.5) .. controls (153.5,254.6) and (159.1,249) .. (166,249) .. controls (172.9,249) and (178.5,254.6) .. (178.5,261.5) .. controls (178.5,268.4) and (172.9,274) .. (166,274) .. controls (159.1,274) and (153.5,268.4) .. (153.5,261.5) -- cycle ;

    %Straight Lines [id:da8111485597522028] 
    \draw    (67,129.5) -- (67,119.37) -- (167,119.5) -- (167,129.5) ;

    %Shape: Circle [id:dp5550396643085889] 
    \draw   (54.5,142.5) .. controls (54.5,135.6) and (60.1,130) .. (67,130) .. controls (73.9,130) and (79.5,135.6) .. (79.5,142.5) .. controls (79.5,149.4) and (73.9,155) .. (67,155) .. controls (60.1,155) and (54.5,149.4) .. (54.5,142.5) -- cycle ;

    %Straight Lines [id:da4358037156768244] 
    \draw [line width=1.5]    (167,177.7) -- (167,158.5) ;
    \draw [shift={(167,155.5)}, rotate = 450] [fill={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=1.5]  [draw opacity=0] (11.61,-5.58) -- (0,0) -- (11.61,5.58) -- cycle    ;

    %Straight Lines [id:da35373187835236874] 
    \draw [line width=1.5]    (114,109.37) -- (114,119.37) ;

    %Straight Lines [id:da1620841210006193] 
    \draw [line width=1.5]    (166,239.5) -- (166,220.3) ;
    \draw [shift={(166,217.3)}, rotate = 450] [fill={rgb, 255:red, 0; green, 0; blue, 0 }  ][line width=1.5]  [draw opacity=0] (11.61,-5.58) -- (0,0) -- (11.61,5.58) -- cycle    ;

    %Straight Lines [id:da9258346349543058] 
    \draw [line width=1.5]    (166,239.5) -- (166,249.5) ;

    % Text Node
    \draw (167,141.5) node   {$G( z)$};
    % Text Node
    \draw (181.5,119.5) node [scale=0.8,color={rgb, 255:red, 155; green, 155; blue, 155 }  ,opacity=1 ] [align=left] {fake};
    % Text Node
    \draw (52.5,118.5) node [scale=0.8,color={rgb, 255:red, 155; green, 155; blue, 155 }  ,opacity=1 ] [align=left] {real};
    % Text Node
    \draw (116,12.83) node  [align=left] {real/fake};
    % Text Node
    \draw (134.17,290) node [scale=0.8] [align=left] {a) Generative Adversarial Networks};
    % Text Node
    \draw (67.5,139) node   {$x$};
    % Text Node
    \draw (168,259.5) node   {$z$};
    % Text Node
    \draw (166,197.5) node [scale=1.7280000000000002] [align=left] {G};
    % Text Node
    \draw (114,66.17) node [scale=1.7280000000000002] [align=left] {D};


\end{tikzpicture}



\end{document}

nn-generative_adversarial_network_manual_net+neuralnet.tex

\documentclass[crop,tikz]{standalone}
\usepackage{tikz}

\usetikzlibrary{positioning}

\begin{document}
\begin{tikzpicture}

	\node[circle, draw, thick] (z) {$\vec{z}$};
	\node[circle, draw, thick, right=5em of z] (x) {$\vec{x}_{fake}$};
	\draw[-stealth, thick] (z) -- node[above] {$G(\vec{z})$} node[below] {generator} (x);
	\node[left=of z] (i) {};
	\draw[-stealth, thick] (i) -- node[above] {$p_\theta(\vec{z})$} (z);
	\node[above=of x, circle, draw, thick] (xt) {$\vec{x}_{real}$};
	\node[left=5em of xt] (it) {};
	\draw[-stealth, thick] (it) -- node[above] {$p_{data}(\vec{x})$} (xt);
	\node[circle, draw, thick, right=5em of x, yshift=2.5em] (D) {$\vec{x}$};
	\node[right=7em of D] (out) {real?};
	\draw[-stealth, thick] (D) -- node[above] {$D(\vec{x})$} node[below] {discriminator} (out);
			
	\node[right=2.5em of x, circle, fill, inner sep=0.15em] (pt1) {};
	\node[right=2.5em of xt, circle, fill, inner sep=0.15em] (pt2) {};
			
	\draw[dashed, thick] (pt1) edge[bend left] (pt2);
			
	\node[circle, draw, thick, fill=white, inner sep=0.15em] at ([xshift=-0.9em, yshift=4em]pt1.north) (pt3) {};
			
	\draw[-stealth, thick] (x) -- (pt1);
	\draw[-stealth, thick] (xt) -- (pt2);
	\draw[-stealth, thick] (pt3) -- (D);

\end{tikzpicture}
\end{document}

nn-generator+neuralnet+matrix.tex

\documentclass[landscape]{article}
\usepackage{tikz}

%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>

\usepackage[margin=1cm]{geometry}
\usepackage{tikz,pgfplots,pgf}
\usetikzlibrary{matrix,shapes,arrows,positioning}

\begin{document}


\begin{figure}[htp]
\centering
\begin{tikzpicture}[
  plain/.style={
    draw=none,
    fill=none,
    },
  dot/.style={draw,shape=circle,minimum size=3pt,inner sep=0,fill=black
    },
  net/.style={
    matrix of nodes,
    nodes={
      draw,
      circle,
      inner sep=8.5pt
      },
    nodes in empty cells,
    column sep=0.6cm,
    row sep=-11pt
    },
  >=latex
  ]
  \matrix[net] (mat)
  {
  |[plain]| \parbox{1cm}{\centering Input\\layer} 
            & |[plain]| \parbox{1cm}{\centering Hidden\\layer} 
                        & |[plain]| \parbox{1cm}{\centering Output\\layer} \\
            & |[plain]|                 \\
  |[plain]| &            & |[plain]|    \\
            & |[plain]|  &              \\
  |[plain]| & |[dot]|                   \\
            & |[plain]|  & |[dot]|      \\
  |[plain]| & |[dot]|    & |[plain]|    \\
  |[dot]|   & |[plain]|  & |[dot]|      \\
  |[dot]|   & |[dot]|    & |[plain]|    \\
  |[dot]|   & |[plain]|  &              \\
  |[plain]| &            & |[plain]|    \\
            & |[plain]|                 \\
  };
  \foreach \ai/\mi in {2/B01,4/B02,6/B03,12/Bn}
    \draw[<-] (mat-\ai-1) -- node[above] {\mi} +(-1cm,0);
  \foreach \ai in {2,4,6,12}
  {\foreach \aii/\mii in {3/H1,11/Hn}
    \draw[->] (mat-\ai-1) -- (mat-\aii-2) node[yshift=0.6cm] {\mii};
  }
  \foreach \ai in {3,11}
  {  \draw[->] (mat-\ai-2) -- (mat-4-3);
    \draw[->] (mat-4-3) -- node[above] {Var1} +(1cm,0);}
  \foreach \ai in {3,11}
  {  \draw[->] (mat-\ai-2) -- (mat-10-3);
    \draw[->] (mat-10-3) -- node[above] {Varn} +(1cm,0);}
\end{tikzpicture}

\caption{ANN diagram for the Generator.}
\label{fig_m_3}
\end{figure}

\end{document}

nn-hopfield_auto_net+neuralnet+foreach+scope+learn+style+command.tex

% https://raw.githubusercontent.com/MartinThoma/LaTeX-examples/master/tikz/hopfield-network/hopfield-network.tex
\documentclass[varwidth=true, border=2pt]{standalone}
\usepackage{tikz}

\tikzstyle{neuron}=[draw,circle,minimum size=20pt,inner sep=0pt, fill=white]
\tikzstyle{stateTransition}=[very thick]
\tikzstyle{learned}=[text=red]

\begin{document}
\newcommand\n{5}
\begin{tikzpicture}[scale=1.3]
    \begin{scope}[rotate=17]
        %the multiplication with floats is not possible. Thus I split the loop in two.
        \foreach \number in {1,...,\n}{
            \node[neuron] (N-\number) at ({\number*(360/\n)}:1.5cm) {$x_\number$};
        }

        \foreach \number in {1,...,\n}{
            \foreach \y in {1,...,\n}{
                \draw[stateTransition] (N-\number) -- (N-\y);
            }
        }
        \end{scope}
        \begin{scope}[rotate=-1]
        \draw[learned,stateTransition] (N-1) -- (N-2) node [midway,above=-0.15cm,sloped] {$w_{1,2}$};
        \draw[learned,stateTransition] (N-1) -- (N-5) node [midway,above=-0.15cm,sloped] {$w_{1,5}$};
    \end{scope}
\end{tikzpicture}
\end{document}

nn-neural_network-1h+neuralnet+foreach.tex

% http://www.texample.net/media/tikz/examples/TEX/neural-network.tex
\documentclass{standalone}

\usepackage{tikz}
\usepackage{verbatim}

\begin{comment}
:Title: Neural network
:Tags: Foreach

The ``\foreach`` command is very useful for quickly creating structured graphics
like this neural network diagram.

\end{comment}

\begin{document}
\pagestyle{empty}

\def\layersep{2.5cm}

\begin{tikzpicture}[shorten >=1pt,->,draw=black!50, node distance=\layersep]
    \tikzstyle{every pin edge}=[<-,shorten <=1pt]
    \tikzstyle{neuron}=[circle,fill=black!25,minimum size=17pt,inner sep=0pt]
    \tikzstyle{input neuron}=[neuron, fill=green!50];
    \tikzstyle{output neuron}=[neuron, fill=red!50];
    \tikzstyle{hidden neuron}=[neuron, fill=blue!50];
    \tikzstyle{annot} = [text width=4em, text centered]

    % Draw the input layer nodes
    \foreach \name / \y in {1,...,4}
    % This is the same as writing \foreach \name / \y in {1/1,2/2,3/3,4/4}
        \node[input neuron, pin=left:Input \#\y] (I-\name) at (0,-\y) {};

    % Draw the hidden layer nodes
    \foreach \name / \y in {1,...,5}
        \path[yshift=0.5cm]
            node[hidden neuron] (H-\name) at (\layersep,-\y cm) {};

    % Draw the output layer node
    \node[output neuron,pin={[pin edge={->}]right:Output}, right of=H-3] (O) {};

    % Connect every node in the input layer with every node in the
    % hidden layer.
    \foreach \source in {1,...,4}
        \foreach \dest in {1,...,5}
            \path (I-\source) edge (H-\dest);

    % Connect every node in the hidden layer with the output layer
    \foreach \source in {1,...,5}
        \path (H-\source) edge (O);

    % Annotate the layers
    \node[annot,above of=H-1, node distance=1cm] (hl) {Hidden layer};
    \node[annot,left of=hl] {Input layer};
    \node[annot,right of=hl] {Output layer};
\end{tikzpicture}
% End of code
\end{document}

nn-stacked_blocks+neuralnet+3d+def+pgf+set+style.tex

\documentclass[tikz]{standalone}

%% Language and font encodings
\usepackage[english]{babel}
\usepackage[utf8x]{inputenc}
\usepackage[T1]{fontenc}

\usepackage{xcolor}
\definecolor{darkblue}{HTML}{1f4e79}
\definecolor{lightblue}{HTML}{00b0f0}
\definecolor{salmon}{HTML}{ff9c6b}

\usetikzlibrary{backgrounds,calc,shadings,shapes.arrows,arrows,shapes.symbols,shadows,positioning,decorations.markings,backgrounds,arrows.meta}

% Define parallelepiped shape:
\makeatletter
\pgfkeys{/pgf/.cd,
  parallelepiped offset x/.initial=2mm,
  parallelepiped offset y/.initial=2mm
}
\pgfdeclareshape{parallelepiped}
{
  \inheritsavedanchors[from=rectangle] % this is nearly a rectangle
  \inheritanchorborder[from=rectangle]
  \inheritanchor[from=rectangle]{north}
  \inheritanchor[from=rectangle]{north west}
  \inheritanchor[from=rectangle]{north east}
  \inheritanchor[from=rectangle]{center}
  \inheritanchor[from=rectangle]{west}
  \inheritanchor[from=rectangle]{east}
  \inheritanchor[from=rectangle]{mid}
  \inheritanchor[from=rectangle]{mid west}
  \inheritanchor[from=rectangle]{mid east}
  \inheritanchor[from=rectangle]{base}
  \inheritanchor[from=rectangle]{base west}
  \inheritanchor[from=rectangle]{base east}
  \inheritanchor[from=rectangle]{south}
  \inheritanchor[from=rectangle]{south west}
  \inheritanchor[from=rectangle]{south east}
  \backgroundpath{
    % store lower right in xa/ya and upper right in xb/yb
    \southwest \pgf@xa=\pgf@x \pgf@ya=\pgf@y
    \northeast \pgf@xb=\pgf@x \pgf@yb=\pgf@y
    \pgfmathsetlength\pgfutil@tempdima{\pgfkeysvalueof{/pgf/parallelepiped
      offset x}}
    \pgfmathsetlength\pgfutil@tempdimb{\pgfkeysvalueof{/pgf/parallelepiped
      offset y}}
    \def\ppd@offset{\pgfpoint{\pgfutil@tempdima}{\pgfutil@tempdimb}}
    \pgfpathmoveto{\pgfqpoint{\pgf@xa}{\pgf@ya}}
    \pgfpathlineto{\pgfqpoint{\pgf@xb}{\pgf@ya}}
    \pgfpathlineto{\pgfqpoint{\pgf@xb}{\pgf@yb}}
    \pgfpathlineto{\pgfqpoint{\pgf@xa}{\pgf@yb}}
    \pgfpathclose
    \pgfpathmoveto{\pgfqpoint{\pgf@xb}{\pgf@ya}}
    \pgfpathlineto{\pgfpointadd{\pgfpoint{\pgf@xb}{\pgf@ya}}{\ppd@offset}}
    \pgfpathlineto{\pgfpointadd{\pgfpoint{\pgf@xb}{\pgf@yb}}{\ppd@offset}}
    \pgfpathlineto{\pgfpointadd{\pgfpoint{\pgf@xa}{\pgf@yb}}{\ppd@offset}}
    \pgfpathlineto{\pgfqpoint{\pgf@xa}{\pgf@yb}}
    \pgfpathmoveto{\pgfqpoint{\pgf@xb}{\pgf@yb}}
    \pgfpathlineto{\pgfpointadd{\pgfpoint{\pgf@xb}{\pgf@yb}}{\ppd@offset}}
  }
}
\makeatother

\tikzset{
  % Dark blue blocks
  block/.style={
    parallelepiped,fill=white, draw,
    minimum width=0.8cm,
    minimum height=2.4cm,
    parallelepiped offset x=0.5cm,
    parallelepiped offset y=0.5cm,
    path picture={
      \draw[top color=darkblue,bottom color=darkblue]
        (path picture bounding box.south west) rectangle 
        (path picture bounding box.north east);
    },
    text=white,
  },
  % Orange-ish blocks
  conv/.style={
    parallelepiped,fill=white, draw,
    minimum width=0.8cm,
    minimum height=2.4cm,
    parallelepiped offset x=0.5cm,
    parallelepiped offset y=0.5cm,
    path picture={
      \draw[top color=salmon,bottom color=salmon]
        (path picture bounding box.south west) rectangle 
        (path picture bounding box.north east);
    },
    text=white,
  },
  % Taller Light blue blocks:
  plate/.style={
    parallelepiped,fill=white, draw,
    minimum width=0.1cm,
    minimum height=7.4cm,
    parallelepiped offset x=0.5cm,
    parallelepiped offset y=0.5cm,
    path picture={
      \draw[top color=lightblue,bottom color=lightblue]
        (path picture bounding box.south west) rectangle 
        (path picture bounding box.north east);
    },
    text=white,
  },
  % Arrows between blocks:
  link/.style={
    color=lightblue,
    line width=2mm,
  },
}

\begin{document}

\begin{tikzpicture}
  % The order of blocks matters since some are partially hidden behind subsequent blocks.
  \node[conv](conv1){\rotatebox{90}{Conv}};
  \node[plate,right=0.2cm of conv1](plate1){};
  % yshift to align the bottom of that blocks with the previous taller block.
  \node[block,right=0.2cm of plate1,yshift=-2.5cm](resblock1){\rotatebox{90}{ResBlock}};
  \node[block,above=0.1cm of resblock1](resblock2){\rotatebox{90}{ResBlock}};
  \node[block,above=0.1cm of resblock2](resblock3){\rotatebox{90}{ResBlock}};
  \node[block,right=0.2cm of resblock1](x1){\rotatebox{90}{(X4)}};
  \node[block,above=0.1cm of x1](x2){\rotatebox{90}{(X3)}};
  \node[block,above=0.1cm of x2](x3){\rotatebox{90}{(X2)}};
  \node[plate,right=0.2cm of x2](plate2){};
  \node[block,right=0.6cm of x2](resblock4){\rotatebox{90}{ResBlock4}};
  \node[block,right=2cm of resblock4](resblock5){\rotatebox{90}{ResBlock5}};
  \node[conv,right=0.2cm of resblock5](conv2){\rotatebox{90}{Conv}};
  \draw [-,link] ([xshift=0.2cm,yshift=0.2cm]resblock4.east) -- ([yshift=0.2cm]resblock5.west);
  \draw [-triangle 60,link] ([xshift=0.2cm,yshift=0.2cm]conv2.east) -- ([xshift=1.5cm,yshift=0.2cm]conv2.east);
\end{tikzpicture}

\end{document}

nn-SVM_manual+neuralnet.tex

\documentclass{article}
\usepackage[paperwidth=4in,paperheight=4in]{geometry}

\usepackage{tikz}


\begin{document}

\usetikzlibrary{arrows}
\begin{tikzpicture}
  % Draw axes
  \draw [thick] (0,5) node (yaxis) [above] {$y$}
        |- (5,0) node (xaxis) [right] {$x$};
  % draw line
  \draw (0,-1) -- (5,4); % y=x-1
  \draw[dashed] (-1,0) -- (4,5); % y=x+1
  \draw[dashed] (2,-1) -- (6,3); % y=x-3
  % \draw labels
  \draw (3.5,3) node[rotate=45,font=\small] 
        {$\mathbf{w}\cdot \mathbf{x} + b = 0$};
  \draw (2.5,4) node[rotate=45,font=\small] 
        {$\mathbf{w}\cdot \mathbf{x} + b = 1$};
  \draw (4.5,2) node[rotate=45,font=\small] 
        {$\mathbf{w}\cdot \mathbf{x} + b = -1$};
  % draw distance
  \draw[dotted] (4,5) -- (6,3);
  \draw (5.25,4.25) node[rotate=-45] {$\frac{2}{\Vert \mathbf{w} \Vert}$};
  \draw[dotted] (0,0) -- (0.5,-0.5);
  \draw (0,-0.5) node[rotate=-45] {$\frac{b}{\Vert \mathbf{w} \Vert}$};
  \draw (2,1) -- (1.5,1.5);
  \draw (1.85,1.35) node[rotate=-45] {$\mathbf{w}$};
  % draw negative dots
  \fill[red] (0.5,1.5) circle (3pt);
  \fill[red]   (1.5,2.5)   circle (3pt);
  \fill[black] (1,2.5)     circle (3pt);
  \fill[black] (0.75,2)    circle (3pt);
  \fill[black] (0.6,1.9)   circle (3pt);
  \fill[black] (0.77, 2.5) circle (3pt);
  \fill[black] (1.5,3)     circle (3pt);
  \fill[black] (1.3,3.3)   circle (3pt);
  \fill[black] (0.6,3.2)   circle (3pt);
  % draw positive dots
  \draw[red,thick] (4,1)     circle (3pt); 
  \draw[red,thick] (3.3,.3)  circle (3pt); 
  \draw[black]     (4.5,1.2) circle (3pt); 
  \draw[black]     (4.5,.5)  circle (3pt); 
  \draw[black]     (3.9,.7)  circle (3pt); 
  \draw[black]     (5,1)     circle (3pt); 
  \draw[black]     (3.5,.2)  circle (3pt); 
  \draw[black]     (4,.3)    circle (3pt); 
\end{tikzpicture}


\end{document}

noise+diagram.tex

% http://www.texample.net/media/tikz/examples/TEX/noise-shaper.tex
% Title: Block diagram of Third order noise shaper in Compact Disc Players
% Author: RamÃ³n Jaramillo
\documentclass[tikz,14pt,border=10pt]{standalone}
%%%<
\usepackage{verbatim}
%%%>
\begin{comment}
:Title: Block diagram of Third order noise shaper in Compact Disc Players
:Tags: Diagrams;Block diagrams;Electrical engineering
:Author: RamÃ³n Jaramillo
:Slug: noise-shaper

This is a block diagram of a third-order noise shaper, circuit located inside
of a compact disc player.

Source: A fundamental introduction to the Compact Disc Player (1994), 
located in http://www.tc.umn.edu/~erick205/Papers/3011Paper.pdf, page 17
by Grant M. Erickson
\end{comment}
\usepackage{textcomp}
\usetikzlibrary{shapes,arrows}
\begin{document}
% Definition of blocks:
\tikzset{%
  block/.style    = {draw, thick, rectangle, minimum height = 3em,
    minimum width = 3em},
  sum/.style      = {draw, circle, node distance = 2cm}, % Adder
  input/.style    = {coordinate}, % Input
  output/.style   = {coordinate} % Output
}
% Defining string as labels of certain blocks.
\newcommand{\suma}{\Large$+$}
\newcommand{\inte}{$\displaystyle \int$}
\newcommand{\derv}{\huge$\frac{d}{dt}$}

\begin{tikzpicture}[auto, thick, node distance=2cm, >=triangle 45]
	\draw
		% Drawing the blocks of first filter :
		node at (0,0)[right=-3mm]{\Large \textopenbullet}
		node [input, name=input1] {} 
		node [sum, right of=input1] (suma1) {\suma}
		node [block, right of=suma1] (inte1) {\inte}
			node at (6.8,0)[block] (Q1) {\Large $Q_1$}
			node [block, below of=inte1] (ret1) {\Large$T_1$};
		% Joining blocks. 
		% Commands \draw with options like [->] must be written individually
		\draw[->](input1) -- node {$X(Z)$}(suma1);
		\draw[->](suma1) -- node {} (inte1);
		\draw[->](inte1) -- node {} (Q1);
		\draw[->](ret1) -| node[near end]{} (suma1);
		% Adder
	\draw
		node at (5.4,-4) [sum, name=suma2] {\suma}
			% Second stage of filter 
		node at  (1,-6) [sum, name=suma3] {\suma}
		node [block, right of=suma3] (inte2) {\inte}
		node [sum, right of=inte2] (suma4) {\suma}
		node [block, right of=suma4] (inte3) {\inte}
		node [block, right of=inte3] (Q2) {\Large$Q_2$}
		node at (9,-8) [block, name=ret2] {\Large$T_2$}
	;
		% Joining the blocks of second filter
		\draw[->] (suma3) -- node {} (inte2);
		\draw[->] (inte2) -- node {} (suma4);
		\draw[->] (suma4) -- node {} (inte3);
		\draw[->] (inte3) -- node {} (Q2);
		\draw[->] (ret2) -| (suma3);
		\draw[->] (ret2) -| (suma4);
			% Third stage of filter:
		% Defining nodes:
	\draw
		node at (11.5, 0) [sum, name=suma5]{\suma}
		node [output, right of=suma5]{}
		node [block, below of=suma5] (deriv1){\derv}
		node [output, right of=suma5] (sal2){}
	;
		% Joining the blocks:
		\draw[->] (suma2) -| node {}(suma3);
		\draw[->] (Q1) -- (8,0) |- node {}(ret1);
		\draw[->] (8,0) |- (suma2);
		\draw[->] (5.4,0) -- (suma2);
		\draw[->] (Q1) -- node {}(suma5);
		\draw[->] (deriv1) -- node {}(suma5);
		\draw[->] (Q2) -| node {}(deriv1);
			\draw[<->] (ret2) -| node {}(deriv1);
			\draw[->] (suma5) -- node {$Y(Z)$}(sal2);
			% Drawing nodes with \textbullet
	\draw
		node at (8,0) {\textbullet} 
		node at (8,-2){\textbullet}
		node at (5.4,0){\textbullet}
			node at (5,-8){\textbullet}
			node at (11.5,-6){\textbullet}
			;
		% Boxing and labelling noise shapers
		\draw [color=gray,thick](-0.5,-3) rectangle (9,1);
		\node at (-0.5,1) [above=5mm, right=0mm] {\textsc{first-order noise shaper}};
		\draw [color=gray,thick](-0.5,-9) rectangle (12.5,-5);
		\node at (-0.5,-9) [below=5mm, right=0mm] {\textsc{second-order noise shaper}};
\end{tikzpicture}
\end{document}

paper_folding+misc+foreach.tex

%\documentclass[border=10pt]{standalone}
\documentclass{article}
\usepackage[paperwidth=4in,paperheight=4in]{geometry}
\usepackage{tikz}

\pagestyle{empty}

\begin{document}

\usetikzlibrary{folding}

\begin{tikzpicture}[transform shape]
	\tikzfoldingdodecahedron
	[folding line length=6mm,
	face 1={ \node[red] {1};},
	face 2={ \node {2};},
	face 3={ \node {3};},
	face 4={ \node {4};},
	face 5={ \node {5};},
	face 6={ \node {6};},
	face 7={ \node {7};},
	face 8={ \node {8};},
	face 9={ \node {9};},
	face 10={\node {10};},
	face 11={\node {11};},
	face 12={\node {12};}];
  \end{tikzpicture}


\end{document}

physics-diagram-handshake.tex

\documentclass[tikz, border=5mm]{standalone}

\usetikzlibrary{arrows,shadows,positioning}

\begin{document}

\begin{tikzpicture}[font=\sffamily,>=stealth',thick,
    commentl/.style={text width=3cm, align=right},
    commentr/.style={commentl, align=left},]
    \node[] (init) {\LARGE Initiator};
    \node[right=1cm of init] (recv) {\LARGE Receiver};

    \draw[->] ([yshift=-1.7cm]init.south) coordinate (fin1o) -- ([yshift=-.7cm]fin1o-|recv) coordinate (fin1e) node[pos=.3, above, sloped] {FIN};

    \draw[->] ([yshift=-.3cm]fin1e) coordinate (ack1o) -- ([yshift=-.7cm]ack1o-|init) coordinate (ack1e) node[pos=.3, above, sloped] {ACK};

    \draw[->] (ack1e-|recv) coordinate (fin2o) -- ([yshift=-.7cm]fin2o-|init) coordinate (fin2e) node[pos=.3, above, sloped] {FIN};

    \draw[->] ([yshift=-.3cm]fin2e) coordinate (ack2o) -- ([yshift=-.7cm]ack2o-|recv) coordinate (ack2e) node[pos=.3, above, sloped] {ACK};

    \draw[thick, shorten >=-1cm] (init) -- (init|-ack2e);
    \draw[thick, shorten >=-1cm] (recv) -- (recv|-ack2e);

    \draw[dotted] (recv.285)--([yshift=2mm]recv.285|-fin1e) coordinate[pos=.5] (aux1);

    \draw[dotted] (init.255)--([yshift=2mm]init.255|-fin1o);

    \draw[dotted] ([yshift=1mm]init.255|-fin2e) --([yshift=-5mm]init.255|-ack2e) coordinate (aux2);

    \node[commentr, right =2mm of ack2e] {\textbf{CLOSED}};
    \node[commentr, right =2mm of fin2o] {\textbf{LAST ACK}};
    \node[below left = 0mm and 2mm of init.south, commentl]{\textbf{ESTABLISHED}\\[-1.5mm]{\itshape connection}};
    \node[left = 2mm of fin1o.west, commentl]{{\itshape active close}\\[-1mm]\textbf{FIN\_WAIT\_1}};
    \node[left = 2mm of ack1e.west, commentl]{\textbf{FIN\_WAIT\_2}};
    \node[below left = -1mm and 2mm of fin2e.west, commentl]{\textbf{TIME\_WAIT}};
    \node[below left = -1mm and 2mm of aux2-|init, commentl]{\textbf{CLOSED}};

    \node[right = 2mm of recv|-aux1, commentr]{\textbf{ESTABLISHED}\\[-1.5mm]{\itshape connection}};
    \node[right = 2mm of fin1e.west, commentr]{\textbf{CLOSE\_WAIT}\\[-1mm]{\itshape passive close}};
\end{tikzpicture}

\end{document}

physics-impact-particles_table.tex

% Standard model of physics
% Author: Carsten Burgard
\documentclass[border=10pt]{standalone}
\usepackage{tikz}
\usetikzlibrary{calc,positioning,shadows.blur,decorations.pathreplacing}
\usepackage{etoolbox}

\tikzset{%
        brace/.style = { decorate, decoration={brace, amplitude=5pt} },
       mbrace/.style = { decorate, decoration={brace, amplitude=5pt, mirror} },
        label/.style = { black, midway, scale=0.5, align=center },
     toplabel/.style = { label, above=.5em, anchor=south },
    leftlabel/.style = { label,rotate=-90,left=.5em,anchor=north },   
  bottomlabel/.style = { label, below=.5em, anchor=north },
        force/.style = { rotate=-90,scale=0.4 },
        round/.style = { rounded corners=2mm },
       legend/.style = { right,scale=0.4 },
        nosep/.style = { inner sep=0pt },
   generation/.style = { anchor=base },
       dasher/.style = { orange, dashed }   % color for graviton
}

% the style for each of the particles
% #1 fill color; #2 symbol; #3 name; #4 mass; #5 spin; #6 charge; #7 colors
%
\newcommand\particle[7][white]{%
  \begin{tikzpicture}[x=1cm, y=1cm]
    \path[fill=#1,blur shadow={shadow blur steps=5}] (0.1,0) -- (0.9,0)
        arc (90:0:1mm) -- (1.0,-0.9) arc (0:-90:1mm) -- (0.1,-1.0)
        arc (-90:-180:1mm) -- (0,-0.1) arc(180:90:1mm) -- cycle;
    \ifstrempty{#7}{}{\path[fill=purple!50!white]                           % colors: band, purple
        (0.6,0) --(0.7,0) -- (1.0,-0.3) -- (1.0,-0.4);}
    \ifstrempty{#6}{}{\path[fill=green!50!black!50] (0.7,0) -- (0.9,0)      % charge: corner, green
        arc (90:0:1mm) -- (1.0,-0.3);}
    \ifstrempty{#5}{}{\path[fill=orange!50!white] (1.0,-0.7) -- (1.0,-0.9)  % spin: bottom corner, orange
        arc (0:-90:1mm) -- (0.7,-1.0);}
    \draw[\ifstrempty{#2}{dasher}{black}] (0.1,0) -- (0.9,0)                % line
        arc (90:0:1mm) -- (1.0,-0.9) arc (0:-90:1mm) -- (0.1,-1.0)
        arc (-90:-180:1mm) -- (0,-0.1) arc(180:90:1mm) -- cycle;
    \ifstrempty{#7}{}{\node at(0.825,-0.175) [rotate=-45,scale=0.2] {#7};}      % colors
    \ifstrempty{#6}{}{\node at(0.9,-0.1)  [nosep,scale=0.17] {#6};}             % charge
    \ifstrempty{#5}{}{\node at(0.9,-0.9)  [nosep,scale=0.2] {#5};}              % spin
    \ifstrempty{#4}{}{\node at(0.1,-0.1)  [nosep,anchor=west,scale=0.25]{#4};}  % mass
    \ifstrempty{#3}{}{\node at(0.1,-0.85) [nosep,anchor=west,scale=0.3] {#3};}  % name
    \ifstrempty{#2}{}{\node at(0.1,-0.5)  [nosep,anchor=west,scale=1.5] {#2};}  % symbol
  \end{tikzpicture}
}


\begin{document}
\begin{tikzpicture}[x=1.2cm, y=1.2cm]
  % draw force blocks
  \draw[round] (-0.5,0.5) rectangle (4.4,-1.5);     % strong force
  \draw[round] (-0.6,0.6) rectangle (5.0,-2.5);     % electromagnetic force
  \draw[round] (-0.7,0.7) rectangle (5.6,-3.5);     % weak force

  % draw all particles  
  \node at(0, 0)   {\particle[gray!20!white]
                    {$u$}        {up}       {$2.3$ MeV}{1/2}{$2/3$}{R/G/B}};
  \node at(0,-1)   {\particle[gray!20!white]
                    {$d$}        {down}    {$4.8$ MeV}{1/2}{$-1/3$}{R/G/B}};
  \node at(0,-2)   {\particle[gray!20!white]
                    {$e$}        {electron}       {$511$ keV}{1/2}{$-1$}{}};
  \node at(0,-3)   {\particle[gray!20!white]
                    {$\nu_e$}    {$e$ neutrino}         {$<2$ eV}{1/2}{}{}};
  \node at(1, 0)   {\particle
                    {$c$}        {charm}   {$1.28$ GeV}{1/2}{$2/3$}{R/G/B}};
  \node at(1,-1)   {\particle 
                    {$s$}        {strange}  {$95$ MeV}{1/2}{$-1/3$}{R/G/B}};
  \node at(1,-2)   {\particle
                    {$\mu$}      {muon}         {$105.7$ MeV}{1/2}{$-1$}{}};
  \node at(1,-3)   {\particle
                    {$\nu_\mu$}  {$\mu$ neutrino}    {$<190$ keV}{1/2}{}{}};
  \node at(2, 0)   {\particle
                    {$t$}        {top}    {$173.2$ GeV}{1/2}{$2/3$}{R/G/B}};
  \node at(2,-1)   {\particle
                    {$b$}        {bottom}  {$4.7$ GeV}{1/2}{$-1/3$}{R/G/B}};
  \node at(2,-2)   {\particle
                    {$\tau$}     {tau}          {$1.777$ GeV}{1/2}{$-1$}{}};
  \node at(2,-3)   {\particle
                    {$\nu_\tau$} {$\tau$ neutrino}  {$<18.2$ MeV}{1/2}{}{}};
  \node at(3,-3)   {\particle[orange!20!white]
                    {$W^{\hspace{-.3ex}\scalebox{.5}{$\pm$}}$}               
                                {}              {$80.4$ GeV}{1}{$\pm1$}{}}; % W
  \node at(4,-3)   {\particle[orange!20!white]
                    {$Z$}        {}                    {$91.2$ GeV}{1}{}{}}; % Z
  \node at(3.5,-2) {\particle[green!50!black!20]
                    {$\gamma$}   {photon}                        {}{1}{}{}}; % gamma-photon
  \node at(3.5,-1) {\particle[purple!20!white]
                    {$g$}        {gluon}                    {}{1}{}{color}}; % g-gluon
  \node at(5,0)    {\particle[gray!50!white]
                    {$H$}        {Higgs}              {$125.1$ GeV}{0}{}{}}; % H-Higgs
  \node at(6.1,-3) {\particle[gray!5!white]
                    {}           {graviton}                       {}{}{}{}}; % graviton

  % add text labels for forces
  \node at(4.25,-0.5) [force]      {strong nuclear force (color)};
  \node at(4.85,-1.5) [force]    {electromagnetic force (charge)};
  \node at(5.45,-2.4) [force] {weak nuclear force (weak isospin)};
  \node at(6.75,-2.5) [force]        {gravitational force (mass)};

  % draw arrows and add labels for legends
  \draw [<-] (2.50,0.30)  -- (2.7,0.3)          node [legend] {charge};
  \draw [<-] (2.50,0.15)  -- (2.7,0.15)         node [legend] {colors};
  \draw [<-] (2.05,0.25)  -- (2.3,0) -- (2.7,0) node [legend]   {mass};
  \draw [<-] (2.50,-0.3)  -- (2.7,-0.3)         node [legend]   {spin};

  % draw vertical braces and labels
  \draw [mbrace] (-0.8,0.5)  -- (-0.8,-1.5)
                  node[leftlabel] {6 quarks\\(+6 anti-quarks)};
  \draw [mbrace] (-0.8,-1.5) -- (-0.8,-3.5)
                  node[leftlabel] {6 leptons\\(+6 anti-leptons)};
  % draw bottom braces and labels                  
  \draw [mbrace] (-0.5,-3.6) -- (2.5,-3.6)
                  node[bottomlabel]
                  {12 fermions\\(+12 anti-fermions)\\increasing mass $\to$};
  \draw [mbrace] (2.5,-3.6) -- (5.5,-3.6)
                  node[bottomlabel] {5 bosons\\(+1 opposite charge $W$)};

  % draw top braces and add text labels
  \draw [brace] (-0.5,.8) -- (0.5,.8) node[toplabel]         {standard matter};
  \draw [brace] (0.5,.8)  -- (2.5,.8) node[toplabel]         {unstable matter};
  \draw [brace] (2.5,.8)  -- (4.5,.8) node[toplabel]          {force carriers};
  \draw [brace] (4.5,.8)  -- (5.5,.8) node[toplabel]       {Goldstone\\bosons};  % two lines
  \draw [brace] (5.5,.8)  -- (7,.8)   node[toplabel] {outside\\standard model};  % two lines

  % add big numbers on top
  \node at (0,1.2)   [generation] {1\tiny st};
  \node at (1,1.2)   [generation] {2\tiny nd};
  \node at (2,1.2)   [generation] {3\tiny rd};
  \node at (2.8,1.2) [generation] {\tiny generation};
\end{tikzpicture}
\end{document}

physics-moon_synodic_period.tex

% https://tex.stackexchange.com/a/338201/173708
\documentclass[a4paper,portrait]{article}

\usepackage{tikz}
\usepackage[margin=0.3in]{geometry}

\usetikzlibrary{scopes}
\usetikzlibrary{intersections}
\usetikzlibrary{calc}
\usetikzlibrary{arrows.meta}

\begin{document}

\begin{tikzpicture} [
    scale=0.7,
    node font=\LARGE,
    dashed axis/.style={dash pattern=on 4pt off 2pt},
    moon line/.style={dash pattern=on 8pt off 4pt},
    information text/.style={rounded corners, fill=Info Color, inner sep=1ex}
]

\definecolor{Earth Color}{HTML}{358af3};
\definecolor{Sun Color}{HTML}{fffc00};
\definecolor{Moon Color}{HTML}{ddbd4c};
\definecolor{Info Color}{HTML}{eeeeee};

\def\SunPosition{16};

% draw Earth xy-frame (fixed direction Earth frame), and the Earth at the origin
\fill (0, 0) [Earth Color, opacity=.6] circle (1cm);
\draw[{Stealth[length=0.3cm]}-{Stealth[length=0.3cm]}] (-4, 0) -- (16, 0) node [right=1em] {$x$};
\draw[{Stealth[length=0.3cm]}-{Stealth[length=0.3cm]}] (0, -4) -- (0, 16) node [above=1em] {$y$};
\filldraw (0, 0) circle (3pt);
\path (0, 0) node [shift={(-3.5, 1.6)}, anchor=north west] {\Large EARTH};

% draw Earth x'y'-frame (Earth frame directed at Sun, ie 'Noon-frame'), and the Sun on the y'-axis
\begin{scope}[rotate around={-55:(0, 0)}]
\fill (0, \SunPosition) coordinate (S) [Sun Color, opacity=.7] circle (1.5cm);
\draw[{Stealth[length=0.3cm]}-{Stealth[length=0.3cm]}] (-4, 0) -- (10, 0) coordinate (X') node [right=1em] {$x'$};
\draw[{Stealth[length=0.3cm]}-{Stealth[length=0.3cm]}] (0, -4) -- (0, 24) node [above=1em] {$y'$};
\filldraw (0, \SunPosition) circle (3pt);
\end{scope}
\draw[line width=2pt] (0.6,0) -- ($(0,0)!(0.6,0)!(S)$);
\draw[line width=2pt] (0.6,0) -- ($(0,0)!(0.6,0)!(X')$);

% draw arrow for Earth's orbital motion
\draw[-{Stealth[length=0.6cm]},line width=3pt,Earth Color,rotate around={203:(S)}] ($(S) + (21,0)$) arc [start angle=0, end angle=10, radius=21];

% draw Sun's x''y''-frame (fixed direction Sun frame)
\begin{scope}[shift={(S)}]
\draw[{Stealth[length=0.3cm]}-{Stealth[length=0.3cm]}, dashed axis] (-4, 0) -- (4, 0) node [right=1em] {$x''$};
\draw[{Stealth[length=0.3cm]}-{Stealth[length=0.3cm]}, dashed axis] (0, -4) -- (0, 8) node [above=1em] {$y''$};
\draw[-{Stealth[length=0.3cm]}, green!60!black] (2.5, 0) arc [start angle=0, end angle=215, radius=2.5] node[pos=0.65,above left] {$\pi + \theta$};
\path (0, 0) node [shift={(2.2,-1.2)}] {\Large SUN (fixed)};
\end{scope}

% draw Moon
\begin{scope}[rotate around={-20:(0, 0)}]
\fill (0, 7) coordinate (M) [Moon Color, opacity=.8] circle (.7cm);
\draw[moon line] (0, 0) -- (0, 15);
\filldraw (0, 7) circle (3pt);
\node [shift={(-0.8,1)}] at (0, 7) {\Large MOON};
\draw[-{Stealth[length=0.6cm]},line width=3pt,Moon Color,rotate around={-10:(0, 0)}] (0, 9.5) arc [start angle=90, end angle=110, radius=9.5];
\end{scope}

% draw various angles including Moon phase angle psi
\draw[-{Stealth[length=0.3cm]},green!60!black] (2, 0) arc [start angle=0, end angle=70, radius=2] node[pos=0.7,above right=-4pt] {$\phi$};
\draw[-{Stealth[length=0.3cm]},green!60!black] (3.5, 0) arc [start angle=0, end angle=35, radius=3.5] node[pos=0.45,above right=-2pt] {$\theta$};
\draw[-{Stealth[length=0.3cm]}, red!80!black,rotate around={-55:(0, 0)}] (5, 0) arc [start angle=0, end angle=125, radius=5] node[pos=0.3, below right=-2pt] {$\psi$};

% draw information box
\draw[shift={(10, -11)}] node[above right, text width=7cm,information text] {
    \Large
    {\boldmath
    \textbf{\underline{Moon Phase Angle $\psi$}} }

    \vspace{1ex}
    \large
    \begin{description}
    {\boldmath
    \item[$xy$-axes]= fixed direction but moving frame centered on Earth
    \item[$x'y'$-axes]= moving 'noon' frame centered on Earth (always points at Sun)
    \item[$x''y''$-axes]= fixed frame of Sun
    \item[$\psi$]= moon phase angle =} $\pi/2 + (\phi - \theta)$
    \end{description}
};

\node[above right] at (-5, -11) {\Large \textbf{Fig. 1} \hspace{0.1cm} Moon Phase Angle};

\end{tikzpicture}

\end{document}

physics-poincare+diagram+foreach+set+command.tex

% http://www.texample.net/media/tikz/examples/TEX/poincare.tex
% PoincarÃ© Diagram: Classification of Phase Portraits in the (det A,Tr A)-plane
% Author: Gernot Salzer, 22 Jan 2017
\documentclass[tikz,border=10pt]{standalone}
%%%<
\usepackage{verbatim}
%%%>
\begin{comment}
:Title: Poincare Diagram, Classification of Phase Portraits
:Features: 
:Tags: Arcs;Foreach;Markings;Diagrams;Plots;Mathematics
:Author: Gernot Salzer
:Slug: poincare

The solutions of a system of linear differential equations can be
classified according to the trace and the determinant of the
coefficient matrix. This diagram show schematically the different
types of solutions.

Originally published on TeX.SX, tex.stackexchange.com/a/347401, 6 Jan 2017
Based on a manual drawing by Douglas R. Hundley,
http://people.whitman.edu/~hundledr/courses/M244/Poincare.pdf

You may use the code without any restrictions; no rights reserved. 
\end{comment}

\usetikzlibrary{decorations.markings}

\tikzset
 {every pin/.style = {pin edge = {<-}},    % pins are arrows from label to point
  > = stealth,                            % arrow tips look like stealth bombers
  flow/.style =    % everything marked as "flow" will be decorated with an arrow
   {decoration = {markings, mark=at position #1 with {\arrow{>}}},
    postaction = {decorate}
   },
  flow/.default = 0.5,          % default position of the arrow is in the middle
  main/.style = {line width=1pt}                    % thick lines for main graph
 }

% \newtemplate[Scaling, default 0.18]{\NameOfTemplate}{Caption}{Code}
%
% Typesets Code and stores it in the box \NameOfTemplate.
% This way we avoid nested tikzpictures when inserting the templates into the
% main picture, since nesting is not guaranteed to work.
\newcommand\newtemplate[4][0.18]%
 {\newsavebox#2%
  \savebox#2%
   {\begin{tabular}{@{}c@{}}
      \begin{tikzpicture}[scale=#1]
      #4
      \end{tikzpicture}\\[-1ex]
      \templatecaption{#3}\\[-1ex]
    \end{tabular}%
   }%
 }
\newcommand\template[1]{\usebox{#1}}             % use the Code stored in box #1
\newcommand\templatecaption[1]{{\sffamily\scriptsize#1}}       % typeset caption
\newcommand\Tr{\mathop{\mathrm{Tr}}}

\newtemplate\sink{sink}%
 {\foreach \sx in {+,-}                   % for right/left half do:
   {\draw[flow] (\sx4,0) -- (0,0);        %   draw half of horizontal axis
    \draw[flow] (0,\sx4) -- (0,0);        %   draw half of vertical axis
    \foreach \sy in {+,-}                 %   for upper/lower quadrant do:
      \foreach \a/\b in {2/1,3/0.44}      %     draw two half-parabolas
        \draw[flow,domain=\sx\a:0] plot (\x, {\sy\b*\x*\x});
   }
 }

\newtemplate\source{source}%
 {\foreach \sx in {+,-}                   % for right/left half do:
   {\draw[flow] (0,0) -- (\sx4,0);        %   draw half of horizontal axis
    \draw[flow] (0,0) -- (0,\sx4);        %   draw half of vertical axis
    \foreach \sy in {+,-}                 %   for upper/lower quadrant do:
      \foreach \a/\b in {2/1,3/0.44}      %     draw two half-parabolas
        \draw[flow,domain=0:\sx\a] plot (\x, {\sy\b*\x*\x});
   }
 }

\newtemplate\stablefp{line of stable fixed points}%
 {\draw (-4,0) -- (4,0);                  % draw horizontal axis
  \foreach \sy in {+,-}                   % for upper/lower half do:
   {\draw[flow] (0,\sy4) -- (0,0);        %   draw half of vertical axis
    \foreach \x in {-3,-2,-1,1,2,3}       %   draw six vertical half-lines
      \draw[flow] (\x,\sy3) -- (\x,0);
   }
 }

\newtemplate\unstablefp{line of unstable fixed points}%
 {\draw (-4,0) -- (4,0);                  % draw horizontal axis
  \foreach \sy in {+,-}                   % for upper/lower half do:
   {\draw[flow] (0,0) -- (0,\sy4);        %   draw half of vertical axis
    \foreach \x in {-3,-2,-1,1,2,3}       %   draw six vertical half-lines
      \draw[flow] (\x,0) -- (\x,\sy3);
   }
 }

\newtemplate\spiralsink{spiral sink}%
 {\draw (-4,0) -- (4,0);                  % draw horizontal axis
  \draw (0,-4) -- (0,4);                  % draw vertical axis
  \draw [samples=100,smooth,domain=27:7]  % draw spiral
       plot ({\x r}:{0.005*\x*\x});       % Using "flow" here gives "Dimension
  \def\x{26}                              %        too large", so we draw a tiny
  \draw[->] ({\x r}:{0.005*\x*\x}) -- +(0.01,-0.01);%     tangent for the arrow.
 }

\newtemplate\spiralsource{spiral source}%
 {\draw (-4,0) -- (4,0);                  % draw horizontal axis
  \draw (0,-4) -- (0,4);                  % draw vertical axis
  \draw [samples=100,smooth,domain=10:28] % draw spiral
       plot ({-\x r}:{0.005*\x*\x});      % Using "flow" here gives "Dimension
  \def\x{27.5}                            %        too large", so we draw a tiny
  \draw[<-] ({-\x r}:{0.005*\x*\x}) -- +(0.01,-0.008);%   tangent for the arrow.
 }

\newtemplate[0.15]\centre{center}% British spelling since \center is in use
 {\draw (-4,0) -- (4,0);                  % draw horizontal axis
  \draw (0,-4) -- (0,4);                  % draw vertical axis
  \foreach \r in {1,2,3}                  % draw three circles
    \draw[flow=0.63] (\r,0) arc (0:-360:\r cm);
 }

\newtemplate\saddle{saddle}%
 {\foreach \sx in {+,-}                   % for right/left half do:
   {\draw[flow] (\sx4,0) -- (0,0);        %   draw half of horizontal axis
    \draw[flow] (0,0) -- (0,\sx4);        %   draw half of vertical axis
    \foreach \sy in {+,-}                 %   for upper/lower quadrant do:
      \foreach \a/\b/\c/\d in {2.8/0.3/0.7/0.6, 3.9/0.4/1.3/1.1}
        \draw[flow] (\sx\a,\sy\b)         %     draw two bent lines
          .. controls (\sx\c,\sy\d) and (\sx\d,\sy\c)
          .. (\sx\b,\sy\a);
   }
 }

\newtemplate\degensink{degenerate sink}%
 {\draw (0,-4) -- (0,4);                  % draw vertical axis
  \foreach \s in {+,-}                    % for upper/lower half do:
   {\draw[flow] (\s4,0) -- (0,0);         %   draw half of horizontal axis
    \foreach \a/\b/\c/\d in {3.5/4/1.5/1, 2.5/2/1/0.8}
      \draw[flow] (\s-3.5,\s\a)           %   draw two bent lines
        .. controls (\s\b,\s\c) and (\s\b,\s\d)
        .. (0,0);
   }
 }

\newtemplate\degensource{degenerate source}%
 {\draw (0,-4) -- (0,4);                  % draw vertical axis
  \foreach \s in {+,-}                    % for upper/lower half do:
   {\draw[flow] (0,0) -- (\s4,0);         %   draw half of horizontal axis
    \foreach \a/\b/\c/\d in {3.5/4/1.5/1, 2.5/2/1/0.8}
      \draw[flow] (0,0)                   %   draw two bent lines
        .. controls (\s\b,\s\d) and (\s\b,\s\c)
        .. (\s-3.5,\s\a);
   }
 }

\begin{document}
\begin{tikzpicture}[line cap=round,line join=round]
  % MAIN DIAGRAM
  \draw [main,->] (0,-0.3) -- (0,4.7)                            % vertical axis
    node [label={[above]$\scriptstyle\det A$}] {}
    node

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