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

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);

Answer 1

[VBBV]

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

[VBBV]

Matlab uses one based indexing

[Awesome]

Thank you,it works.

Answer 2

[Askic V]

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.

[Awesome]

Thanks for your reply

[Awesome]

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

>>

Answer 3

[salman]

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'.