i dont understand the error of this code

if true
  % code
clear all;
Q1=-2;
Q2=1;
Epsilono=8.8419e-12;
a=[-1 0];
b=[1 0];
[x,y]=meshgrid(-2:.2:2);
end

[Azzi Abdelmalek]

There is no error

[Iván]

I ran your code but I didn't received any error message.

[the cyclist]

When you say "the error", do you mean that the code crashes and gives an error message? If so, what is the full error message?

Or does it give an unexpected result? If so, then what did you expect (and why?), and how is the result different?

Remember, all we know about your particular problem is what you share with us.