Hi,

Thanks for the report. Can you open an issue on github.

Thanks,

Bruno

On Thursday, July 14, 2016 at 6:07:16 AM UTC-4, Michał Wichrowski wrote:
>
> Dear all, 
> Matrix multiplication requires resulting matrix to be initialized. Even if 
> rebuild_sparsity_C = true .
>
> template <typename number>
> template <typename numberB, typename numberC>
> void
> SparseMatrix<number>::mmult (SparseMatrix<numberC>       &C,
>                              const SparseMatrix<numberB> &B,
>                              const Vector<number>        &V,
>                              const bool                   
> rebuild_sparsity_C) const
> {
>   const bool use_vector = V.size() == n() ? true : false;
>   Assert (n() == B.m(), ExcDimensionMismatch(n(), B.m()));
>   Assert (cols != 0, ExcNotInitialized());
>   Assert (B.cols != 0, ExcNotInitialized());
>   Assert (C.cols != 0, ExcNotInitialized()); //HERE!!
>

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