please I am getting this error at line 7 Error in code1 (line 7) plot(I, sw_total,'o');

clear all; close all; clc;
%%Switching Energy Loss vs Collector Current( Fig.13,125oC
sw_on=[0 3.4 4.5 5.55 6.6 7.45 8.05 8.65]*0.001;%mJ
sw_off=[0 1.85 2.1 2.38 2.75 3.2 3.78 4.38]*0.001;%mJ
sw_total=sw_on+sw_off; %mJ

plot(I, sw_total,'o');
x=0:100;
y= -4.2885*10^(-8)*x.^2 + 0.00013567*x -3.0661*10^(-5);
plot(I,sw_total,'ro',x,y);


%%Switching Loss Calculation
Tj= 125;
Vbase=600; Vdc=600;
 a=-4.2885*10^(-8);b=0.00013567; c=3.0661*10^(-5);
 
syms theta;
i=0;
j=0;
for fsw=10000:2000:30000
    j=j+1;
    i=0;  
for  I=10:5:100
    i=i+1;
   F_sw= a*(I*sin(theta))^2 + b*I*sin(theta)+ c;
   Cal_sw_loss(i,j) = double((Vdc/(Vbase*2*pi)) *int(F_sw,theta, O, pi)*fsw);
end
end
surf(Cal_sw_loss); hold on; colorbar('Eastoutside');
axis([1 j 1 i 0 100]);
set(gca, 'XTick',1:5:11);
set(gca, 'YTick',1:6:19);
set(gca, 'YTick',0:20:140);

[Torsten]

Where do you define "I" in your code ? I don't see it.

And replace

int(F_sw,theta, O, pi)

by

int(F_sw,theta, 0, pi)

[Awesome]

Warning: Imaginary parts of complex X and/or Y arguments ignored.

> In code1 (line 7)

Warning: Imaginary parts of complex X and/or Y arguments ignored.

> In code1 (line 10)

I am getting this error after.

[Torsten]

I don't know how you set "I" in your modified code - so I cannot comment on this.

Answer 1

[Harshit Gupta]

Hi @Awesome,

As per my understanding, the initial error that you were facing has been resolved by following @Torsten's inputs. And now you are getting the following warning: (I am assuming that you have defined the variable "I", and then you are getting this warning)

Warning: Imaginary parts of complex X and/or Y arguments ignored.

Please refer to the below MATLAB Answers link to resolve this warning:

https://www.mathworks.com/matlabcentral/answers/96197-why-do-i-get-warning-messages-about-imaginary-parts-of-complex-x-and-or-y-arguments-ignored