[petsc-users] Converting a Parallel(MPI) Matrix to a Sequential Matrix

[Anthony Dowling]

Thank you for your help, Matthew.

With those methods, will I be able to copy the contents of the created
serial matrices back to a parallel matrix if needed? If so, what is a good
way to do that?

Thanks,
Anthony Dowling


On Mon, Sep 7, 2020 at 11:12 AM Matthew Knepley <knepley at gmail.com> wrote:

> On Mon, Sep 7, 2020 at 11:00 AM Anthony Dowling <dowlinah at clarkson.edu>
> wrote:
>
>> Hello all,
>>
>> Is there a method to convert a parallel(MPI) dense matrix to a sequential
>> dense matrix? Also to do the same in reverse? The code I am using needs to
>> be able to convert a float** matrix to a Petsc matrix, and then later
>> convert that Petsc matrix between MPI dense and sequential dense. How might
>> this be achieved? The code seems to be converting float** matrices to Petsc
>> properly, but I am unable to find a method to convert between MPI and
>> sequential matrices.
>>
>
> If you want the serial matrix everywhere, this is easy:
> https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatCreateRedundantMatrix.html
> If you want it just on 1 process, you can use:
> https://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatCreateSubMatrices.html
>
>   Thanks,
>
>     Matt
>
>
>> Thanks in advance,
>> Anthony Dowling
>>
>
>
> --
> 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
>
> https://www.cse.buffalo.edu/~knepley/
> <http://www.cse.buffalo.edu/~knepley/>
>
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