[petsc-dev] Bug in MatMatMultTranspose for sequantial AIJ matrices from petsc-dev?

[Dmitry Karpeev]

It seems to me the problem here is a historic accident:
Originally MatMatMultTraspose did just what Stefano (and, a perhaps
outdated, webpage) says: A^T*B.
Then MatMatTransposeMult was introduced to do that, and MatMatMultTranspose
was repurposed to do A*B^T.
That's the state that Stefano's petsc-dev is probably in -- already
inconsistent with that old webpage, but before
the final renaming of the subroutines.

Dmitry.

On Wed, Nov 9, 2011 at 8:42 AM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> On Wed, Nov 9, 2011 at 08:12, Stefano Zampini <stefano.zampini at gmail.com>wrote:
>>
>> I had some problems using MatMatMultTranspose for SeqAIJ matrices. It
>> seems to me that MatMatMultTranspose(A,B,...,MAT_INITIAL_MATRIX,&C), which
>> should perform C=A^T*B according to the web pages, doesn't its job.
>
>
> petsc-dev has several new MatMatMult routines, so we had to rename some of
> these functions for consistency. The function you name does not exist any
> more, it is replaced by MatTransposeMatMult(), and there is a new
> MatMatTransposeMult().
>
> http://lists.mcs.anl.gov/pipermail/petsc-dev/2011-November/006213.html
>
> Hong, please update src/docs/website/documentation/changes/dev.html when
> you make API changes.
>
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