MATLAB: How to plot these functions in 3D space

3d plotsgraphMATLABplotting

Hi,
I want to plot the following variables U, s1, s2, x1 and x2 in a 3D plot. How do I go about this in MATLAB?
if true
   if x1*(x1 - x2) >= 0
    s1 = x1;
   else
    s1 = 0;
   end
   if -x2*(x1 - x2) >= 0
    s2 = x2;
   else
    s2 =0;
   end
   U = G*(a*s1 + (1-a)*s2); % G and a are constants.
end
From what I understand this will require a sampling frequency. F = 100000 should suffice for my needs. I just want to know what the approach is for such problems.
Thanks.
Shilp

Best Answer

It's still not clear to me what you mean by F=1e5. You cannot plot a 1e5 x 1e5 array of data. It will be too huge. Below is my guess as to what you really want.
 [x1,x2]=ndgrid(linspace(-100,100,1000));
 s1=x1;
 s1(x1*(x1 - x2) < 0)=0;
surf(x1,x2,s1);
and similarly for s2 and U...
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