[petsc-dev] Problem with SNES and FieldSplit

[Matthew Knepley]

On Tue, Mar 15, 2011 at 5:41 PM, Jed Brown <jed at 59a2.org> wrote:

> On Tue, Mar 15, 2011 at 23:33, Matthew Knepley <knepley at gmail.com> wrote:
>
>> If it does exactly what I just said, I will. However, from my reading, it
>> does not.
>
>
> You can do it with MatNestGetSubMats(), modify one entry,
> MatNestSetSubMats(). But if you plan to do this often, add
> MatNestUpdateSubMat(). Hmm, seems like MatNestGetSubMats() should return the
> row and column ISs for symmetry.
>

That is not what I have here. I want to change a portion, but outside of
that I want it to fall back to a global matrix.

   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
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