Watch this Author's files
After to save the freefem mesh I saved the vectorial solution:
file << "2 1 1 "<< u1.n << " 2 \n";
for (int j=0;j<u1.n ; j++)
file << u1[j] <<" "<< u2[j] << endl;
Now I need to plot velocity vectors as arrows with components (u,v) at the points (x,y).
could you give a example how to do that? Do you have any m-file? Thanks!