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

[Matthew Knepley]

On Thu, Oct 15, 2015 at 1:36 PM, Jed Brown <jed at jedbrown.org> wrote:

> Matthew Knepley <knepley at gmail.com> writes:
> > Jed, is TAIJ the way to do this?
>
> No, TAIJ is unrelated.
>

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?

  Thanks,

     Matt

-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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