[petsc-users] Access to submatrix owned by an other processor

[Matthew Knepley]

On Mon, Sep 25, 2017 at 4:26 AM, Benedusi Pietro <pietro.benedusi at usi.ch>
wrote:

> Dear all,
>
> there is a way to access an arbitrary block of a parallel matrix? It
> should work also in the case where the block is owned by an other processor.
>
> I have seen that you can use MatCreateRedundantMatrix() to copy the entire
> matrix in a processor, but this solution is not very efficient if I just
> need a (small) block of it.
> I have also tried to use MatGetSubMatrix() but does not seem to work.
>

Why does MatGetSubMatrix() not work?

  Thanks,

    Matt


> Thank you very much for any help,
> Pietro
>
-- 
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.caam.rice.edu/~mk51/>
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