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

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Awesome
Awesome 2022-11-7
回答： salman 2024-1-29
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
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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采纳的回答

VBBV
VBBV 2022-11-7
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

更多回答（2 个）

Askic V
Askic V 2022-11-7
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.
salman
salman 2024-1-29
Ran in:
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'.

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