Hi Frederic,
you may not be using sparse the way you intend. In this syntax, the third input is the values of the sparse matrix. Perhaps, you wanted something more like
vertexFaceConnectivity=sparse(ind,ind,F(:),numVertices,numFaces);
Since ind repeats values, that however would mean that you are setting the same values repeatedly - is that intended?. sparse then sums those values, as you can see in this mini-example:
ind = [1 2 3 1 2 3];
F = 1:6;
sparse(ind, ind, F)
If I had to guess, I would think that you intended to create a tri-diagonal matrix? I would use spdiags for that.
Best wishes,
Harald
