[petsc-dev] broken TS example related to Jacobian and coloring etc.

[Jed Brown]

On Wed, Aug 15, 2012 at 6:41 AM, Barry Smith <bsmith at mcs.anl.gov> wrote:

> I think it uses null in order to delay computing the matrix coloring etc
> from the time of SNESSetJacobian() to a later time.   I guess what could
> happen is it creates a n "empty" fdcoloring beast and passes that into
> SNESSetJacobian() and then fills it up later when it has the information it
> needs.


Right, I think I would prefer that. A side-effect is that the caller
setting coloring is now responsible for ownership of the context. but it is
for everything else anyway.

Lisandro asked for destructors for those contexts, but I'm not sure we need
a separate one for every context slot. Would one per SNES be enough?
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