[petsc-users] can MatGetSubMatrix extract remote rows?

[Fande Kong]

If I am interested in extracting some remote and local rows and columns but
as another sequential matrix, then I have to use  MatGetSubMatrices? There
are no ways to use MatGetSubMatrix to get a sequential matrix? Because I am
only interested in one sequential matrix per core not multi matrices.

Fande,

On Tue, May 19, 2015 at 4:40 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
> > On May 19, 2015, at 5:33 PM, Fande Kong <fande.kong at colorado.edu> wrote:
> >
> > Hi all,
> >
> > I am confused with MatGetSubMatrix and MatGetSubMatrices.  In my
> understanding, I think MatGetSubMatrix extracts local rows and columns to
> form another parallel matrix with the same communicator, while
> MatGetSubMatrices extracts both local and remote entities to construct some
> sequential matrices. Is it right?
>
>   Yes except that MatGetSubMatrix can also use remote rows (and columns)
> for the part that is on a particular processor. That is it is not
> restricted to only grabbing local rows/columns in the new parallel matrix.
>
>
> >
> > Thanks,
> >
> > Fande,
>
>
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