[petsc-users] question about MatMatMult

[Hong Zhang]

Michael :

> Dear Petsc developers,
> I'm gradually moving from the version 3.2 to the version 3.4.
> I had to skip the version 3.3 because of the bug in MatMatMult that has
> been reported to you.
>
> What I see is that the MatMatMult works well but there is a difference:
> in the version 3.2 if a sparse matrix was multiplied by a dense matrix the
> result was dense.
> In the version 3.4 the result is sparse.
>

 A sparse matrix multiplied by a dense matrix results in a dense matrix for
all petsc versions.
What makes you conclude "In the version 3.4 the result is sparse"?

Hong

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