[petsc-users] DMShellSetCreateRestriction

[Matthew Knepley]

On Fri, Mar 11, 2016 at 12:26 PM, Dave May <dave.mayhem23 at gmail.com> wrote:

> On 11 March 2016 at 18:11, anton <popov at uni-mainz.de> wrote:
>
>> Hi team,
>>
>> I'm implementing staggered grid in a PETSc-canonical way, trying to build
>> a custom DM object, attach it to SNES, that should later transfered it
>> further to KSP and PC.
>>
>> Yet, the Galerking coarsening for staggered grid is non-symmetric. The
>> question is how possible is it that DMShellSetCreateRestriction can be
>> implemented and included in 3.7 release?
>>
>
> It's a little more work than just adding a new method within the DM and a
> new APIs for DMCreateRestriction() and DMShellSetCreateRestriction().
> PCMG needs to be modified to call DMCreateRestriction().
>

Dave is correct. Currently, PCMG only calls DMCreateInterpolation(). We
would need to add a DMCreateRestriction() call.

  Thanks,

    Matt


> Please, please.
>>
>> Thanks,
>> Anton
>>
>>
>>
>


-- 
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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