diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..21229f7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*.asv
\ No newline at end of file
diff --git a/CASE1.m b/CASE1.m
new file mode 100644
index 0000000..51da101
--- /dev/null
+++ b/CASE1.m
@@ -0,0 +1,27 @@
+function [efficiency, VR, P_r, pf] = CASE1(A, B, C, D)
+%CASE1 Summary of this function goes here
+%   Detailed explanation goes here
+V_r = complex((input('Recieving voltage (in kV): ') / sqrt(3)) * 10^3);
+pf = 0.8;                                        % 0.8 lagging power factor
+phi = -1 * acos(pf);
+P_r = 0:100*10^(3);                              % recieved active power
+P_r = complex(P_r);
+
+
+I_r = complex((P_r/(3*V_r*pf))*cos(phi), (P_r/(3*V_r*pf))*sin(phi));
+                                                 % recieved current
+
+V_s = A * V_r + B * I_r;                         % sending voltage
+I_s = C * V_r + D * I_r;                         % sending current
+
+pfs = cos(angle(V_s) - angle(I_s));
+
+P_s = 3 * (abs(V_s) .* abs(I_s)) .* pfs;         % sending active power
+
+efficiency = (P_r ./ P_s) .* 100;                  % efficiency
+
+V_rnl = V_s / A;                                 % no load voltage
+
+VR = ((abs(V_rnl) - abs(V_r)) / abs(V_r)) * 100; % voltage regulation
+end
+
diff --git a/CASE2.m b/CASE2.m
new file mode 100644
index 0000000..41c9383
--- /dev/null
+++ b/CASE2.m
@@ -0,0 +1,41 @@
+function [efficiency, VR, P_r, pf] = CASE2(A ,B ,C ,D)
+%UNTITLED2 Summary of this function goes here
+%   calculate efficiency and voltage reg for case 2
+V_r = complex((input('Recieving voltage (in kV): ') / sqrt(3)) * 10^3);
+pf = 0.3:0.01:1;  
+phi_lag = -1 * acos(pf);
+phi_lead = acos(pf);
+
+P_r = 100*10^(3);
+P_r = complex(P_r);
+
+I_r_lag = complex((P_r./(3*V_r*pf)).*cos(phi_lag), (P_r./(3*V_r*pf)).*sin(phi_lag));
+I_r_lead = complex((P_r./(3*V_r*pf)).*cos(phi_lead), (P_r./(3*V_r*pf)).*sin(phi_lead));
+
+V_s_lag = A * V_r + B * I_r_lag;                         % sending voltage lag
+I_s_lag = C * V_r + D * I_r_lag;                         % sending current lag
+
+V_s_lead = A * V_r + B * I_r_lead;                         % sending voltage lead 
+I_s_lead = C * V_r + D * I_r_lead;                         % sending current lead
+
+pfs_lag = cos(angle(V_s_lag) - angle(I_s_lag));
+pfs_lead = cos(angle(V_s_lead) - angle(I_s_lead));
+
+
+P_s_lag = 3 * (abs(V_s_lag) .* abs(I_s_lag)) .* pfs_lag;         % sending active power lag
+P_s_lead = 3 * (abs(V_s_lead) .* abs(I_s_lead)) .* pfs_lead;         % sending active power lead
+
+efficiency_lag = (P_r ./ P_s_lag) .* 100;                  % efficiency lag
+efficiency_lead = (P_r ./ P_s_lead) .* 100;                  % efficiency lead
+
+V_rnl_lag = V_s_lag / A;                                 % no load voltage lag
+V_rnl_lead = V_s_lead / A;                                 % no load voltage lead
+
+VR_lag = ((abs(V_rnl_lag) - abs(V_r)) / abs(V_r)) * 100; % voltage regulation lag
+VR_lead = ((abs(V_rnl_lead) - abs(V_r)) / abs(V_r)) * 100; % voltage regulation lead
+
+efficiency = [efficiency_lag efficiency_lead];
+VR = [VR_lag VR_lead];
+
+end
+
diff --git a/TL_param.m b/TL_param.m
deleted file mode 100644
index 116cc48..0000000
--- a/TL_param.m
+++ /dev/null
@@ -1,70 +0,0 @@
-%% Transimission line parameters
-resistivity = input('Please enter the conductor resistivity: ');
-while resistivity <= 0
-    fprintf('****Invalid Input****\n');
-    resistivity = input('Please enter the conductor resistivity: ');
-end
-length = input('Please enter the length in meters: ');
-while length <= 0
-    fprintf('****Invalid Input****\n');
-    length = input('Please enter the length in meters: ');
-end
-diameter = input('Please enter the diameter in centimeters: ');
-while diameter <= 0
-    fprintf('****Invalid Input****\n');
-    diameter = input('Please enter the diameter in centimeters: ');
-end
-radius = (diameter / 2) * 10^(-2);
-area = pi * radius^2 ;
-GMR = radius * exp(-0.25);
-R = resistivity * length/area;
-fprintf('Please enter the number corresponding to your choice\n1-Symetrical system\n2-Unsymetrical system\n');
-choice = input('Choice: ');
-switch choice
-    case 1
-        distance = input('Please enter the seperation distance in meters: ');
-        L = (2 * 10^(-7) * log(distance/GMR)) * length;
-        C = (( 2 * pi * 8.85 * 10 ^(-6))/(log(distance/radius))) * length;
-    case 2
-        dis_1 = input('Please enter the distance between a and b in meters: ');
-        dis_2 = input('Please enter the distance between b and c in meters: ');
-        dis_3 = input('Please enter the distance between a and c in meters: ');
-        dis = dis_1 * dis_2 * dis_3;
-        GMD = nthroot(dis, 3);
-        L = (2 * 10^(-7) * log(GMD/GMR)) * length;
-        C = (( 2 * pi * 8.85 * 10 ^(-6))/(log(GMD/radius))) * length;
-end
-fprintf('The tansmission line per phase resistance R = %f ohm\nThe transmission line per phase inductance L = %f H\nThe transmission line per phase capcitance C = %f uF\n' , R, L, C);
-%% ABCD Parameters
-X_l = 2 * pi * 50 * L;
-Y_c = 2 * pi * 50 * C * 10^(-6);
-Z = complex(R, X_l);
-Y = complex(0, Y_c); 
-if length < 80000
-    fprintf('Short Line Model\n');
-    A = 1;
-    B = Z;
-    C = 0;
-    D = 1;
-    fprintf('A = %0.1f\nB =%f+j%f\nC=%0.1f\nD=%0.1f\n', A, real(B), imag(B), C, D); 
-elseif (length >= 80000) && (length <= 250000)
-    fprintf('Which medium line model would you like to work with?\n1-pi Model\n2-T Model\n');
-    choice = input('Choice: ');
-    switch choice
-        case 1
-            A = 1 + (Z*Y)/2;
-            B = Z;
-            C = Y * (1 + (ZY/4));
-            D = 1 + (Z*Y)/2;
-        case 2
-            A = 1 + (Z*Y)/2;
-            C = Z * (1 + (ZY/4));
-            C = Y;
-            D = 1 + (Z*Y)/2;
-    end
-    fprintf('A = %f+j%f\nB =%f+j%f\nC=%f+j%f\nD=%f+j%f\n', real(A), imag(A), real(B), imag(B), real(C), imag(C), real(D), imag(D));
-elseif length > 250000
-    fprintf('Long Transmission Line has no accurate model\n');
-end
-%%   
-    
\ No newline at end of file
diff --git a/TL_param_fun.m b/TL_param_fun.m
deleted file mode 100644
index eda8c69..0000000
--- a/TL_param_fun.m
+++ /dev/null
@@ -1,12 +0,0 @@
-[resistivity, length, diameter] = start(); %reading the input from the user
-radius = (diameter / 2) * 10^(-2);
-area = pi * radius^2 ;
-R = resistivity * length/area;
-[L, C] = cal_inductance_capactance(radius, length);
-fprintf('The transmission line per phase resistance R = %f ohm\nThe transmission line per phase inductance L = %f H\nThe transmission line per phase capcitance C = %f uF\n' , R, L, C);
-X_l = 2 * pi * 50 * L;
-Y_c = 2 * pi * 50 * C * 10^(-6);
-Z = complex(R, X_l);
-Y = complex(0, Y_c); 
-[A, B, C, D] = abcd_param(Z, Y, length);
-fprintf('A= %f <%f\nB=%f <%f\nC=%f <%f\nD=%f <%f\n', abs(A), angle(A)*180/pi, abs(B), angle(B)*180/pi, abs(C), angle(C)*180/pi, abs(D), angle(D)*180/pi); 
\ No newline at end of file
diff --git a/abcd_param.m b/abcd_param.m
deleted file mode 100644
index d29a204..0000000
--- a/abcd_param.m
+++ /dev/null
@@ -1,28 +0,0 @@
-function [A, B, C, D] = abcd_param(Z, Y, length)
-    if length < 80000
-        fprintf('Short Line Model\n');
-        A = 1;
-        B = Z;
-        C = 0;
-        D = 1;
-        fprintf('A = %0.1f\nB =%f+j%f\nC=%0.1f\nD=%0.1f\n', A, real(B), imag(B), C, D); 
-    elseif (length >= 80000) && (length <= 250000)
-        fprintf('Which medium line model would you like to work with?\n1-pi Model\n2-T Model\n');
-        choice = input('Choice: ');
-        switch choice
-            case 1
-                A = 1 + (Z*Y)/2;
-                B = Z;
-                C = Y * (1 + (Z*Y/4));
-                D = 1 + (Z*Y)/2;
-            case 2
-                A = 1 + (Z*Y)/2;
-                B = Z * (1 + (Z*Y/4));
-                C = Y;
-                D = 1 + (Z*Y)/2;
-        end
-        fprintf('A = %f+j%f\nB =%f+j%f\nC=%f+j%f\nD=%f+j%f\n', real(A), imag(A), real(B), imag(B), real(C), imag(C), real(D), imag(D));
-    elseif length > 250000
-        fprintf('Long Transmission Line has no accurate model\n');
-    end
-end 
\ No newline at end of file
diff --git a/cal_inductance_capactance.m b/cal_inductance_capactance.m
deleted file mode 100644
index d0b9c3f..0000000
--- a/cal_inductance_capactance.m
+++ /dev/null
@@ -1,19 +0,0 @@
-function [L, C] = cal_inductance_capactance(radius, length)
-    fprintf('Please enter the number corresponding to your choice\n1-Symetrical system\n2-Unsymetrical system\n');
-    choice = input('Choice: ');
-    GMR = radius * exp(-0.25);
-    switch choice
-    case 1
-        distance = input('Please enter the seperation distance in meters: ');
-        L = (2 * 10^(-7) * log(distance/GMR)) * length;
-        C = (( 2 * pi * 8.85 * 10 ^(-6))/(log(distance/radius))) * length;
-    case 2
-        dis_1 = input('Please enter the distance between a and b in meters: ');
-        dis_2 = input('Please enter the distance between b and c in meters: ');
-        dis_3 = input('Please enter the distance between a and c in meters: ');
-        dis = dis_1 * dis_2 * dis_3;
-        GMD = nthroot(dis, 3);
-        L = (2 * 10^(-7) * log(GMD/GMR)) * length;
-        C = (( 2 * pi * 8.85 * 10 ^(-6))/(log(GMD/radius))) * length;
-    end
-end 
\ No newline at end of file
diff --git a/capacitance.m b/capacitance.m
new file mode 100644
index 0000000..081d6ae
--- /dev/null
+++ b/capacitance.m
@@ -0,0 +1,6 @@
+function Cap = capacitance(diameter, length, GMD)
+%capacitance Summary of this function goes here
+%   function that calculates the capacitance of the transmission line
+radius = (diameter / 2) * 10^(-2);                       % radius in meters
+Cap = (( 2 * pi * 8.85 * 10 ^(-12))/(log(GMD/radius))) * (length* 10^(3));
+end
\ No newline at end of file
diff --git a/inductance.m b/inductance.m
new file mode 100644
index 0000000..9a96c3f
--- /dev/null
+++ b/inductance.m
@@ -0,0 +1,7 @@
+function L = inductance(diameter, length, GMD)
+%inductance Summary of this function goes here
+%   function that calculates the inductance of the transmission line
+radius = (diameter / 2) * 10^(-2);                  % radius in meters
+GMR = radius * exp(-0.25);                          % gemetric mean radius
+L = (2 * 10^(-7) * log(GMD/GMR))*(length* 10^(3)); % conductor inductance
+end
\ No newline at end of file
diff --git a/lineParameters.m b/lineParameters.m
new file mode 100644
index 0000000..5761820
--- /dev/null
+++ b/lineParameters.m
@@ -0,0 +1,19 @@
+function [A, B, C, D] = lineParameters(length, R, Cap, L)
+%lineParameters Summary of this function goes here
+%   function that calculates ABCD parameters of the transmission line
+
+XL = 2 * pi * 50 * L;               % inductive reactance
+YC = 2 * pi * 50 * Cap;     % capacitive admittance
+Z = complex(R, XL);                 % total complex impedance
+Y = complex(0, YC);                 % total complex admittance
+
+if length < 80
+    [A, B, C, D] = shortLine(Z);
+elseif (length >= 80) && (length <= 250)
+    [A, B, C, D] = midiumLine(Z, Y);
+else
+    [A, B, C, D] = longLine(Z, Y);
+end
+
+end
+
diff --git a/linePerformance.m b/linePerformance.m
new file mode 100644
index 0000000..eea4acd
--- /dev/null
+++ b/linePerformance.m
@@ -0,0 +1,20 @@
+function [efficiency, VR, P_r, pf] = linePerformance(A, B, C, D)
+%linePerformance Summary of this function goes here
+%   Detailed explanation goes here
+
+fprintf('1. CASE I: constant recieving power factor (0.8 lagging)\n');
+fprintf('2. CASE II: constant recieving power (100 kW [full load])\n');
+type = input('');
+
+switch type
+    case 1
+        [efficiency, VR, P_r, pf] = CASE1(A, B, C, D);
+        cftool(P_r, efficiency);
+        cftool(P_r, VR);
+    case 2
+        [efficiency, VR, P_r, pf] = CASE2(A, B, C, D);
+        cftool(pf, efficiency(1:length(efficiency)/2));
+        cftool(pf, VR(1:length(VR)/2));
+        cftool(pf, efficiency(length(efficiency)/2+1:end));
+        cftool(pf, VR(length(VR)/2+1:end));
+end
\ No newline at end of file
diff --git a/longLine.m b/longLine.m
new file mode 100644
index 0000000..0f0e137
--- /dev/null
+++ b/longLine.m
@@ -0,0 +1,14 @@
+function [A, B, C, D] = longLine(Z, Y)
+%longLine Summary of this function goes here
+%   function that calculates ABCD parameters of long transmission line
+%   parameters are set to NaN since they cannot be calculated as the other
+%   two cases
+fprintf("Cannot measure ABCD parameters.\n");
+fprintf("*The distributed nature of the parameters is considered.\n");
+fprintf("*The resistance, inductance, and capacitance of the line are not lumped.\n");
+
+fprintf("Line impedance: %.3f ∠ %.3f° Ω", abs(Z), rad2deg(andle(Z)));
+fprintf("Capacitive admitance: %.3f ∠ %.3f° ℧", abs(Y), rad2deg(andle(Y)));
+
+[A, B, C, D] = struct('x', num2cell([NaN, NaN, NaN, NaN])).x;
+end
\ No newline at end of file
diff --git a/main.m b/main.m
new file mode 100644
index 0000000..773a669
--- /dev/null
+++ b/main.m
@@ -0,0 +1,19 @@
+clc;
+length = input('Transmission line length (in kilo meters): ');
+while length <= 0
+    clc;
+    fprintf('****Invalid Input****\n');
+    length = input('Transmission line length (in kilo meters): ');
+end
+diameter = input('Conductor diameter (in centimeters): ');
+while diameter <= 0
+    clc;
+    fprintf('****Invalid Input****\n');
+    diameter = input('Conductor diameter (in centimeters): ');
+end
+
+[R, Cap, L] = rcl(length, diameter);
+
+[A, B, C, D] = lineParameters(length, R, Cap, L);
+
+[efficiency, VR, P_r, pf] = linePerformance(A, B, C, D);
diff --git a/midiumLine.m b/midiumLine.m
new file mode 100644
index 0000000..078a7e0
--- /dev/null
+++ b/midiumLine.m
@@ -0,0 +1,12 @@
+function [A, B, C, D] = midiumLine(Z, Y)
+%midiumLine Summary of this function goes here
+%   function that calculates ABCD parameters of midiuam transmission line
+model = input('1. Π model\n2. T model');
+switch model
+    case 1
+        [A, B, C, D] = struct('x', num2cell([1 + (Z*Y)/2, Z, Y * (1 + (Z*Y/4)), 1 + (Z*Y)/2])).x;
+    case 2
+        [A, B, C, D] = struct('x', num2cell([1 + (Z*Y)/2, Z * (1 + (Z*Y/4)), Y, 1 + (Z*Y)/2])).x;
+end
+end
+
diff --git a/rcl.m b/rcl.m
new file mode 100644
index 0000000..0429029
--- /dev/null
+++ b/rcl.m
@@ -0,0 +1,20 @@
+function [r, c, l] = rcl(length, diameter)
+%rcl Summary of this function goes here
+%   function that calculates the rcl parameters of the transmission line
+
+type = input('Line spacing: \n1-Symetrical system\n2-Unsymetrical system\n');
+
+switch type
+    case 1
+        GMD = input('Seperation distance (in meters): ');
+    case 2
+        d1 = input('Distance between a and b (in meters): ');
+        d2 = input('Distance between b and c (in meters): ');
+        d3 = input('Distance between a and c (in meters): ');
+        dis = d1 * d2 * d3;
+        GMD = nthroot(dis, 3);
+end
+r = resistance(diameter, length);           % line resistance
+c = capacitance(diameter, length, GMD);     % line capacitance
+l = inductance(diameter, length, GMD);      % line inductance
+end
\ No newline at end of file
diff --git a/resistance.m b/resistance.m
new file mode 100644
index 0000000..701daac
--- /dev/null
+++ b/resistance.m
@@ -0,0 +1,13 @@
+function R = resistance(diameter, length)
+%resistance Summary of this function goes here
+%   function that calculates the resistance of the transmission line
+radius = (diameter / 2) * 10^(-2);          % convert radius to meters
+resistivity = input('Conductor resistivity (in SI units): ');
+while resistivity <= 0
+    clc;
+    fprintf('****Invalid Input****\n');
+    resistivity = input('Conductor resistivity (in SI units): ');
+end
+area = pi * radius^2 ;                      % conductor cross-section area
+R = resistivity * (length* 10^(3))/area;   % conductor resistance
+end
\ No newline at end of file
diff --git a/shortLine.m b/shortLine.m
new file mode 100644
index 0000000..590b495
--- /dev/null
+++ b/shortLine.m
@@ -0,0 +1,6 @@
+function [A, B, C, D] = shortLine(Z)
+%shortLine Summary of this function goes here
+%   function that calculates ABCD parameters of short transmission line
+[A, B, C, D] = struct('x', num2cell([1, Z, 0, 1])).x;
+end
+
diff --git a/start.m b/start.m
deleted file mode 100644
index 267e7e4..0000000
--- a/start.m
+++ /dev/null
@@ -1,19 +0,0 @@
-function [resistivity, length, diameter] = start()
-    clc; 
-    
-    resistivity = input('Please enter the conductor resistivity: ');
-    while resistivity <= 0
-        fprintf('****Invalid Input****\n');
-        resistivity = input('Please enter the conductor resistivity: ');
-    end
-    length = input('Please enter the length in meters: ');
-    while length <= 0
-        fprintf('****Invalid Input****\n');
-        length = input('Please enter the length in meters: ');
-    end
-    diameter = input('Please enter the diameter in centimeters: ');
-    while diameter <= 0
-        fprintf('****Invalid Input****\n');
-        diameter = input('Please enter the diameter in centimeters: ');
-    end
-end
\ No newline at end of file