[petsc-dev] controlling vector values while doing matrix free operations

[Jed Brown]

On Wed, Dec 14, 2011 at 19:34, Dmitry Karpeev <karpeev at mcs.anl.gov> wrote:

> We could support a matrix-free SNESVI if extracting a submatrix from a MF
> matrix was implemented by pre-/post-multiplying it by a suitable P, no?


You can MatGetSubMatrix() a MatMFFD. The implementation calls
MatCreateSubMatrix() and is used by PCFieldSplit.
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