Created attachment 371 [details] repro code Dear Eigen developers, it appeared to me that the last development version of Eigen (5488:3ae0dbb23bbb) is not evaluating sparse/dense matrix/vector multiplication correctly. In particular, some code is failing during template instantiation (missing coeffRef) or seems to compute a bad result (i.e. product returns a null matrix where as it should not be the case). I also attempted multiplication using the selfadjointView. The operation I want to do is: (sparse matrix, row-major) res = A (symmetric sparse matrix, row-major) * v (dense vector) Could you take a look at this repro code and tell what you think about it? Thank you very much for your time. Please note that I tested this on Ubuntu Linux 12.04.2 (64-bits) with GCC 4.6 and the last Eigen development version (5488:3ae0dbb23bbb). This problem has been also seen on Arch Linux 64-bits, GCC 4.7.2.
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