[petsc-users] MatPtAP for involving MPIDENSE and MPIAIJ matrices

[Jed Brown]

Matthew Knepley <knepley at gmail.com> writes:
> I do not understand "unrelated". My understanding was that TAIJ could be
> used (with T = I)
> to get the action of A on a set of vectors, which I think would be A P. Why
> specifically would
> you not use it?

MAIJ is enough for that; it would involve packing P into a Vec, but
Bikash might as well use MatMatMult to perform the same operation in a
more direct way (MatMatMult_MPIAIJ_MPIDense exists).  The problem is
that MatTransposeMatMult_MPIDense_MPIDense needs to be implemented.
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