valid_in.m

%% Import data from text file.
% Script for importing data from the following text file:
%
%    /home/mas/17/elesourb/gitrepo/Fake-news-detection/valid.tsv
%
% To extend the code to different selected data or a different text file,
% generate a function instead of a script.

% Auto-generated by MATLAB on 2018/04/12 10:29:01

%% Initialize variables.
filename = '/home/mas/17/elesourb/gitrepo/Fake-news-detection/valid.tsv';
delimiter = '\t';

%% Read columns of data as text:
% For more information, see the TEXTSCAN documentation.
formatSpec = '%q%q%q%q%q%q%q%q%q%q%q%q%q%q%[^\n\r]';

%% Open the text file.
fileID = fopen(filename,'r');

%% Read columns of data according to the format.
% This call is based on the structure of the file used to generate this
% code. If an error occurs for a different file, try regenerating the code
% from the Import Tool.
dataArray = textscan(fileID, formatSpec, 'Delimiter', delimiter, 'TextType', 'string',  'ReturnOnError', false);

%% Close the text file.
fclose(fileID);

%% Convert the contents of columns containing numeric text to numbers.
% Replace non-numeric text with NaN.
raw = repmat({''},length(dataArray{1}),length(dataArray)-1);
for col=1:length(dataArray)-1
    raw(1:length(dataArray{col}),col) = mat2cell(dataArray{col}, ones(length(dataArray{col}), 1));
end
numericData = NaN(size(dataArray{1},1),size(dataArray,2));

for col=[1,9,10,11,12,13]
    % Converts text in the input cell array to numbers. Replaced non-numeric
    % text with NaN.
    rawData = dataArray{col};
    for row=1:size(rawData, 1)
        % Create a regular expression to detect and remove non-numeric prefixes and
        % suffixes.
        regexstr = '(?<prefix>.*?)(?<numbers>([-]*(\d+[\,]*)+[\.]{0,1}\d*[eEdD]{0,1}[-+]*\d*[i]{0,1})|([-]*(\d+[\,]*)*[\.]{1,1}\d+[eEdD]{0,1}[-+]*\d*[i]{0,1}))(?<suffix>.*)';
        try
            result = regexp(rawData(row), regexstr, 'names');
            numbers = result.numbers;
            
            % Detected commas in non-thousand locations.
            invalidThousandsSeparator = false;
            if numbers.contains(',')
                thousandsRegExp = '^\d+?(\,\d{3})*\.{0,1}\d*$';
                if isempty(regexp(numbers, thousandsRegExp, 'once'))
                    numbers = NaN;
                    invalidThousandsSeparator = true;
                end
            end
            % Convert numeric text to numbers.
            if ~invalidThousandsSeparator
                numbers = textscan(char(strrep(numbers, ',', '')), '%f');
                numericData(row, col) = numbers{1};
                raw{row, col} = numbers{1};
            end
        catch
            raw{row, col} = rawData{row};
        end
    end
end


%% Split data into numeric and string columns.
rawNumericColumns = raw(:, [1,9,10,11,12,13]);
rawStringColumns = string(raw(:, [2,3,4,5,6,7,8,14]));


%% Make sure any text containing <undefined> is properly converted to an <undefined> categorical
for catIdx = [1,3,4,5,6,7,8]
    idx = (rawStringColumns(:, catIdx) == "<undefined>");
    rawStringColumns(idx, catIdx) = "";
end

%% Create output variable
valid = table;
valid.jsonID = cell2mat(rawNumericColumns(:, 1));
valid.label = categorical(rawStringColumns(:, 1));
valid.statement = rawStringColumns(:, 2);
valid.subject = categorical(rawStringColumns(:, 3));
valid.speaker = categorical(rawStringColumns(:, 4));
valid.jobtitle = categorical(rawStringColumns(:, 5));
valid.stateinfo = categorical(rawStringColumns(:, 6));
valid.party = categorical(rawStringColumns(:, 7));
valid.barely_true = cell2mat(rawNumericColumns(:, 2));
valid.false = cell2mat(rawNumericColumns(:, 3));
valid.half_true = cell2mat(rawNumericColumns(:, 4));
valid.mostly_true = cell2mat(rawNumericColumns(:, 5));
valid.pants_on_fire = cell2mat(rawNumericColumns(:, 6));
valid.context = categorical(rawStringColumns(:, 8));

%% Clear temporary variables
clearvars filename delimiter formatSpec fileID dataArray ans raw col numericData rawData row regexstr result numbers invalidThousandsSeparator thousandsRegExp rawNumericColumns rawStringColumns catIdx idx;