[petsc-users] How to set up an interface-type problem

[Matthew Knepley]

On Thu, Oct 20, 2016 at 9:48 AM, Safin, Artur <aks084000 at utdallas.edu>
wrote:

> Matt,
>
>
> You use
>>
>>   http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/
>> MatGetLocalSubMatrix.html
>>   http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Vec/
>> VecGetSubVector.html
>>
>> to put values directly into the subvectors and submatrices. This
>> interacts well with MatNest, so it
>> can be optimized after you get it working.
>>
>>
> Thanks, MatNest and VecNest is what I was looking for.
>
> I have a one more question: if I generate a vector with VecCreateNest,
> will it be allocated separately, or does it somehow reuse the space from
> the original subvectors?
>

With a VecNest, the subvector is not copied.

  Thanks,

    Matt


> Artur
>



-- 
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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