[petsc-dev] DMDA_*PERIODIC and DMDA_XYZGHOSTED

[Dmitry Karpeyev]

On Tue, Dec 7, 2010 at 2:22 PM, Jed Brown <jed at 59a2.org> wrote:

> On Tue, Dec 7, 2010 at 21:20, Barry Smith <bsmith at mcs.anl.gov> wrote:
>
>> How with the DMDA could you have a no copy and still allow nice 2 d and 3d
>> array access of ghost points? It seems to me with DMDA you would always need
>> a copy (or some crazy overloading of [])?
>>
>
> Indeed, you would need overloading which I'm not proposing.
>
>
>> Or do you mean in the DMDA case you get a copy but in the unstructured
>> grid case you get no copy, but the basic paradigm of "local form" is always
>> used?
>>
>
> Yeah, I just want a uniform API.
>
>
>>  In other words all parallel Vecs could have related local forms and the
>> model is "give me local form Vec", scatter to/from local form vec etc?
>>
>
> Yes.
>

ALL Vecs or all Vecs obtained from a DMDA?
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