Please this code says Error using plot. Vectors must be the same length. Error in untitled2 (line 8) plot(I,V,'0');

Question

Awesome 2022-11-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1845183-please-this-code-says-error-using-plot-vectors-must-be-the-same-length-error-in-untitled2-line-8

回答： salman 2024-1-29

采纳的回答： VBBV

clear all; close all; clc;

%%VCE vs. IC (Fig.3, 125oC, VGE=15V)

I=[10 20 30 30 40 50 60 70 80 90 100];

V=[1.5 1.9 2.2 2.5 2.77 3 3.25 3.5 3.72 3.95];

plot(I,V,'o');

x=10:100;

y=-7.9167*10^(-5)*x.^2 + 0.035236*x + 1.1958;

plot(I,V,'o',x,y);

%%Conduction Loss Calculation

Tj= 125; fsw=20000;

a=-7.9167*10^(-5);b=0.035236; c=1.1958;

I=40; M=0.5;

syms theta;

i=0;

j=0;

for M=0.2:0.05:0.8

j=j+i;

duty=0.5*0.5*M*sin(theta);

i=0;

for I=10:5:100

i=i+1;

F_cond=I*sin(theta)*(a*(I*sin(theta))^2+b*I*sin(theta)+c);

Cal_cond_loss(i,j)=double(int(duty*F_cond,theta,0,pi))/(2* pi);

end

surf(Cal_cond_loss); hold on; colorbar('Eastoutside');

axis([1 j 1 i 0 100]);

set(gca, 'XTick',1:4:13);

set(gca, 'YTick',1:6:19);

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Answer 1

VBBV 2022-11-7

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https://ww2.mathworks.cn/matlabcentral/answers/1845183-please-this-code-says-error-using-plot-vectors-must-be-the-same-length-error-in-untitled2-line-8#answer_1093068

在 MATLAB Online 中打开

I=[10 20 30 30 40 50 60 70 80 90 100];
V=[1.5 1.9 2.2 2.5 2.77 3 3.25 3.5 3.72 3.95 4];  % this vector has less number of elements

V has only 10 elements

i=0;
j=0;
for M=0.2:0.05:0.8
    j=j+1;  % change it to 1 and try

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VBBV 2022-11-7

Matlab uses one based indexing

Awesome 2022-11-7

Thank you,it works.

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Answer 2

Askic V 2022-11-7

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It is because I has 11 elements and V has only 10 elements. Thy should have the same number of elements to plot them as (x,y) pairs.

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Awesome 2022-11-7

Thanks for your reply

Awesome 2022-11-7

Index in position 2 is invalid. Array indices must be positive integers or logical values.

Error in untitled2 (line 28)

Cal_cond_loss(i,j)=double(int(duty*F_cond,theta,0,pi))/(2* pi);

Please help check this

>>

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Answer 3

salman 2024-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/1845183-please-this-code-says-error-using-plot-vectors-must-be-the-same-length-error-in-untitled2-line-8#answer_1399016

在 MATLAB Online 中打开

z1=[2 1+7i; 8i 5+8i]
z1 = 
   2.0000 + 0.0000i   1.0000 + 7.0000i
   0.0000 + 8.0000i   5.0000 + 8.0000i
z2=[1+5i 12+4i; 5i 3+13i]
z2 = 
   1.0000 + 5.0000i  12.0000 + 4.0000i
   0.0000 + 5.0000i   3.0000 +13.0000i
real(z1)
ans = 2×2
     2     1
     0     5
real(z2)
ans = 2×2
     1    12
     0     3
imag(z1)
ans = 2×2
     0     7
     8     8
imag(z2)
ans = 2×2
     5     4
     5    13
real(z1+z2)
ans = 2×2
     3    13
     0     8
imag(z1+z2)
ans = 2×2
     5    11
    13    21
conj(z1+z2)
ans = 
   3.0000 - 5.0000i  13.0000 -11.0000i
   0.0000 -13.0000i   8.0000 -21.0000i
Plot(z1+z2,'o')
Unrecognized function or variable 'Plot'.