[petsc-users] Question about MatGetSubMatrices

[Matthew Knepley]

On Sun, Mar 20, 2011 at 10:03 AM, Joshua Booth <jdbst21 at gmail.com> wrote:

> Hi reading about MatGetsubMatrices, that it must be called on all
> processors the same number of times.
> Does this mean all processors in PETSC_COMM_WORLD or on all processors that
> contain the Parent Matrix.
>

All processes in the Mat communicator.


> For example.  If I am using four processors, but only rank=0 has a seq
> matrix A and it wants a seq subA on rank=0, do the other three processors
> need to make a call?
>

No.

   Matt


> Thanks
>
> Josh
>



-- 
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
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