Hello, I'm trying to plot the I-V curve for a MOSFET, but I get a "Vectors must be the same length" error message. I don't understand why this is the case.

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Craig Egan Allistair Tan
Craig Egan Allistair Tan on 16 Nov 2021
clear all; close all; clc;
x1 = 0:0.01:0;
y1 = (0).*x1-(1/2).*x1.^2;
x2 = 0:0.01:6;
y2 = (1/2).*0^2;
x3 = 0:0.01:1;
y3 = (1).*x3-(1/2).*x3.^2;
x4 = 1:0.01:6;
y4 = (1/2).*1^2;
x5 = 0:0.01:2;
y5 = (2).*x5-(1/2).*x5.^2;
x6 = 2:0.01:6;
y6 = (1/2).*2^2;
x7 = 0:0.01:3;
y7 = (3).*x7-(1/2).*x7.^2;
x8 = 3:0.01:6;
y8 = (1/2).*3^2;
x9 = 0:0.01:4;
y9 = (4).*x9-(1/2).*x9.^2;
x10 = 4:0.01:6;
y10 = (1/2).*4^2;
x11 = 0:0.01:5;
y11 = (5).*x11-(1/2).*x11.^2;
x12 = 5:0.01:6;
y12 = (1/2).*5^2;
figure; hold on
x_1 = [x1 x2];
y_1 = [y1 y2];
x_2 = [x3 x4];
y_2 = [y3 y4];
x_3 = [x5 x6];
y_3 = [y5 y6];
x_4 = [x7 x8];
y_4 = [y7 y8];
x_5 = [x9 x10];
y_5 = [y9 y10];
x_6 = [x11 x12];
y_6 = [y11 y12];
b1 = plot(x_1,y_1,'yellow'); M1 = "V_G - V_{th} = 0";
b2 = plot(x_2,y_2,'green'); M2 = "V_G - V_{th} = 1";
b3 = plot(x_3,y_3,'blue'); M3 = "V_G - V_{th} = 2";
b4 = plot(x_4,y_4,'red'); M4 = "V_G - V_{th} = 3";
b5 = plot(x_5,y_5,'cyan'); M5 = "V_G - V_{th} = 4";
b6 = plot(x_6,y_6,'magenta'); M6 = "V_G - V_{th} = 5";
xlabel('V_D')
ylabel('I_D/K')
legend([b1,b2,b3,b4,b5,b6], [M1,M2,M3,M4,M5,M6], 'Location', 'SouthWest')

Answers (1)

VBBV
VBBV on 16 Nov 2021
clear all; close all; clc;
x1 = 0:0.01:6;
y1 = (0).*x1-(1/2).*x1.^2;
x2 = 0:0.01:6;
y2 = (1/2)*x2.^2;
x3 = 0:0.01:6;
y3 = (1).*x3-(1/2).*x3.^2;
x4 = 0:0.01:6;
y4 = (1/2)*x4.^2;
x5 = 0:0.01:6;
y5 = (2).*x5-(1/2).*x5.^2;
x6 = 0:0.01:6;
y6 = (1/2)*x2.^2;
x7 = 0:0.01:6;
y7 = (3).*x7-(1/2).*x7.^2;
x8 = 0:0.01:6;
y8 = (1/2)*x3.^2;
x9 = 0:0.01:6;
y9 = (4).*x9-(1/2).*x9.^2;
x10 = 0:0.01:6;
y10 = (1/2)*x4.^2;
x11 =0:0.01:6;
y11 = (5).*x11-(1/2).*x11.^2;
x12 = 0:0.01:6;
y12 = (1/2)*x5.^2;
figure; hold on
x_1 = [x1 x2];
y_1 = [y1 y2];
x_2 = [x3 x4];
y_2 = [y3 y4];
x_3 = [x5 x6];
y_3 = [y5 y6];
x_4 = [x7 x8];
y_4 = [y7 y8];
x_5 = [x9 x10];
y_5 = [y9 y10];
x_6 = [x11 x12];
y_6 = [y11 y12];
b1 = plot(x_1,y_1,'yellow'); M1 = "V_G - V_{th} = 0";
b2 = plot(x_2,y_2,'green'); M2 = "V_G - V_{th} = 1";
b3 = plot(x_3,y_3,'blue'); M3 = "V_G - V_{th} = 2";
b4 = plot(x_4,y_4,'red'); M4 = "V_G - V_{th} = 3";
b5 = plot(x_5,y_5,'cyan'); M5 = "V_G - V_{th} = 4";
b6 = plot(x_6,y_6,'magenta'); M6 = "V_G - V_{th} = 5";
xlabel('V_D')
ylabel('I_D/K')
legend([b1,b2,b3,b4,b5,b6], [M1,M2,M3,M4,M5,M6], 'Location', 'SouthWest')
use uniform vector size for xcoordinates. oneway is to use linspace function instead of defiining the specfic intervals of xdata.
  1 Comment
Craig Egan Allistair Tan
Craig Egan Allistair Tan on 16 Nov 2021
(x_1,y_1) to (x_6,y_6) are supposed to be piecewise functions. It's why the intervals for the x-values are different. Is there another way I can code this?

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