Problem with surf plot

Dear all. I'm trying to create a 3D plot with surf function. The code is:

    M=A/B; 
v(1,:)=u01;
for n=2:length(t)
    for j=1:length(x)
    v(n,j)=M(n-1,j)*v(n-1,j)';
    end
end
figure(1)
surf(x,t,v)

M is a matrix 201x201, t is a vector 1x101 .and x is another vector 1x201. u01 is an initial condition and it is 1x201. So, there aren't syntax error but the plot is uncorrected. I attach the file. Thanks all.

[KSSV]

What is size of v?

[Giacomo Lucidi]

hi :) v is 101x201

[Star Strider]

Please describe what you want to do.

All we have is code that does not work as you want it to. We have no idea what it is supposed to do.

[Giacomo Lucidi]

    v(n,j)=M(n-1,j)*v(n-1,j)';

This is the final solution for resolve the implicit method of Backward Eulero. I would simply create a 3D plot of this solution. If is necessary I can post the entire script. But I think that it isn't necessary because the previous part is all about the matrix's creation and the definition of initial conditions. Thanks!! ps I attach the file of the Backward Eulero for the transport equation. Now I have to compute the B.E. for diffusion equation.

[Giacomo Lucidi]

I have also this warning from Matlab: "Matrix is singular, close to singular or badly scaled. Results may be inaccurate. RCOND = NaN."

[Image Analyst]

Get rid of the excess black lines by setting the edge color to none:

surf(x,t,v, 'EdgeColor', 'none');

Other than that, I can't run your code because there are too many variables undefined, like M, A, B, u01, and t. If you want my help, you'll have to supply code I can run.

[Giacomo Lucidi]

I attach my script. Thanks for your time.