[petsc-dev] SNES, Coloring, DM, and TS

[Dmitry Karpeev]

On Tue, Feb 28, 2012 at 2:21 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> On Tue, Feb 28, 2012 at 14:16, Dmitry Karpeev <karpeev at mcs.anl.gov> wrote:
>
>> Okay.  I would still refrain from calling these things by the class of
>> the object consuming them.  DMFormFunction() and DMFormIFunction() seem
>> fine, since these have a meaning independent of TS (although the DM has to
>> then encode a transient problem).
>>
>
> The IFunction is a particular way of representing a (part of) a transient
> problem. Its arguments include the time and the time derivative. We have to
> make that clear somehow and I think naming it after TS is helpful.
> Otherwise I'll eventually just have a bunch of names (function, residual,
> rhsfunction, objective, gradient, jacobian, ijacobian, hessian) and not
> know which ones go together.
>

That's why encapsulating the related functions and their linearizations,
one (R,J) pair per DM, is helpful.

Dmitry.


>
>
>>  But I don't like DMGetSNESFunction() any more than I like
>> DMGetKSPJacobian() and DMGetPCJacobian().
>>
>> By the way, should we start using Residual instead of Function?
>>
>
> Yes.
>
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