[petsc-users] Question about handling matrix

[Mark Adams]

Maybe create the large matrix and use
https://www.mcs.anl.gov/petsc/petsc-3.7/docs/manualpages/Mat/MatGetSubMatrix.html
with MAT_REUSE_MATRIX.

Or pad the IS arguments to MatGetSubMatrix with -1, so the size is correct
and PETSc should ignore -1, and use MAT_INITIAL_MATRIX.

Others may know what will work.

Good luck,
Mark

On Wed, Feb 1, 2023 at 5:26 AM 김성익 <ksi2443 at gmail.com> wrote:

> Hello,
>
>
> I want to put small matrix to large matrix.
> The schematic of operation is as below.
> [image: image.png]
> Is there any function for put small matrix to large matrix at once?
>
> Thanks,
> Hyung Kim
>
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