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 2021-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/1587874-hello-i-m-trying-to-plot-the-i-v-curve-for-a-mosfet-but-i-get-a-vectors-must-be-the-same-length

评论： Craig Egan Allistair Tan 2021-11-16

matlab error.png

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')

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Answer 1

VBBV 2021-11-16

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1587874-hello-i-m-trying-to-plot-the-i-v-curve-for-a-mosfet-but-i-get-a-vectors-must-be-the-same-length#answer_832659

在 MATLAB Online 中打开

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.

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Craig Egan Allistair Tan 2021-11-16

(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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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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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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