Is there a way to have a direct access to LU factorization of a sparse matrix? I have a highly sparse matrice and I need to invert them, but I need only somes values. Complete inversion of a matrix take very long time to perform, but partial inversion is very very fast (in theory, same time than factorization of matrix). I used this publication ( https://hpcrd.lbl.gov/~linlin/publications/diagex.pdf) to writea small program to be able to invert only some value of my sparse matrix, but to do that, I need to have access to LU factorization. Thanks you Marc
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