[petsc-users] MatCompositeMerge + MatCreateRedundantMatrix

[Matthew Knepley]

You basically need the inverse of MatCreateSubmatrices(). I do not think we
have that right now, but it could probably be done without too much trouble
by looking at that code.

  Thanks,

     Matt

On Tue, Feb 19, 2019 at 6:15 AM Marius Buerkle via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Hi !
>
> Is there some way to combine MatCompositeMerge
> with MatCreateRedundantMatrix? I basically want to create copies of a
> matrix from PETSC_COMM_WORLD to subcommunicators, do some work on each
> subcommunicator and than gather the results back to PETSC_COMM_WORLD,
> namely  I want to sum the  the invidual matrices from the subcommunicatos
> component wise and get the resulting matrix on PETSC_COMM_WORLD. Is this
> somehow possible without going through all the hassle of using MPI
> directly?
>
> marius
>


-- 
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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