[petsc-dev] DMDA_*PERIODIC and DMDA_XYZGHOSTED

[Dmitry Karpeev]

yeah, I meant that when "stencilwise" access is required, then
VecGetDM(v,&dm);
DMVecGetStencilIterator(dm,v,&itor);
<something to dereference the itor>
etc
In a way, this is similar to DAVecGetArray(), which generalizes VecGetArray
to use the geometric information about the function space (DA) the Vec
belongs to.

On Tue, Dec 7, 2010 at 3:42 PM, Jed Brown <jed at 59a2.org> wrote:

> On Tue, Dec 7, 2010 at 22:40, Dmitry Karpeev <karpeev at mcs.anl.gov> wrote:
>
>> And yet DMDA already defines this local fine-granularity "stencil" access.
>> Where would it go, if not in the DM?  In my opinion this is part of the
>> function space definition:
>> it generalizes VecGetArray to something more geometric.
>>
>
> I just think it should be a DM-level call.  Not VecGetUberCustomIterator.
>  Perhaps I'm wrong, but I think it belongs in the DM.
>
>  Not all DMs have to implement this.
>>
>
> Maybe that's what you were saying too.
>
> Jed
>
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