Hi,

I'm using the Eigen library for 3D computer vision. I'm running visual studio 2010 32bit on a 64 win8 computer.
I must solve a least square problem with 75000 variables and 98351 equations. (Ax=b)
The size the the sparse matrix A is then A(98351,75000).

I have a problem with the solver (SparseLU) but it looks like if the sparse matrix A has some problem due to its size.
When I want to know the size of it, after declaration, I have A.size() < 0. Indeed I get a negative value.

Does someone know what's happening and what to do ?
Thanks

robert

SparseLU is for square problem. Either use SparseQR for least-square solving or assemble the normal equation and use SparseLU, or SimplicialLDLT, or ConjugateGradient.