[petsc-dev] Problem with SNES and FieldSplit

[Jed Brown]

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.
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