[petsc-dev] DMComplex and PCFieldSplit

[Matthew Knepley]

On Fri, Feb 24, 2012 at 2:23 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> We need a richer field interface. Some way for a client of DM to discover
> vector and tensor structure. Possibly also (eventually) a way to solve
> equations of state so that we can formulate reduced problems in
> non-conservative variables.
>
I have fields, and numbers of field components. That is not enough to do
what you suggest, but I don't
think that is necessary. We do not need to know the different between a
vector and pseudo-vector, etc.
I think we just need sizes.

  Matt


> On Feb 24, 2012 2:19 PM, "Matthew Knepley" <knepley at gmail.com> wrote:
>
>> On Fri, Feb 24, 2012 at 1:58 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
>>
>>> http://petsc.cs.iit.edu/petsc/petsc-dev/rev/518ff70e8a0a
>>>
>>> Matt, I want to get rid of these conditionals, not add more. We should
>>> have a DM base interface for getting fields on which to split, that common
>>> interface should _replace_ the DMComposite specialization.
>>>
>>
>> I agree. However, I won't put anything in until I do it by hand once.
>>
>> Also, I was tempted to just promote DMGetGlobalISes(), but its not quite
>> right. I am planning
>> to put the IS method in PetscSection. I am hoping eventually DMDA uses
>> PetscSection for
>> layout.
>>
>>    Matt
>>
>> --
>> 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
>>
>


-- 
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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