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

[Peter Brune]

On Tue, Aug 14, 2012 at 4:47 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> On Tue, Aug 14, 2012 at 3:44 PM, Matthew Knepley <knepley at gmail.com>wrote:
>
>> You can, but the setter routines interpret NULL as "ignore", i.e.
>>>
>>> if (func) ctx->func = func;
>>>
>>
>> Does this make sense to anyone? Can we remove that if?
>
>
> Then we would have to revisit lots of locations and get the old value
> before resetting it. Passing NULL was a convenience.
>

Correct; the sheer amount of code using this convention makes it
exceedingly painful to fix.  It would be much easier to alter our
internals.  I'm *this* close to fugueing on TS especially and removing all
PetscObjects from ctx arguments internal to PETSc.  We can pass the TS
around by PetscObjectCompose using the coarsen/restrict hooks.

- Peter
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