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

[Jed Brown]

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.


>  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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