[petsc-users] Calling MatDestroy on MatGetDiagonalBlock

Jed Brown jed at jedbrown.org
Tue Jan 5 19:29:51 CST 2016

Matthew Knepley <knepley at gmail.com> writes:

> How devastating would it be for Deal.II if we renamed them
> MatCreateSubMatrix()? ;)

I know it's consistent with respect to reference counting semantics, but
it might be harder for new users to find when searching the docs.  I
have no data either way.  I recall discussing years ago that having
paired MatGetSubMatrix/MatRestoreSubMatrix would simplify bookkeeping in
PCFieldSplit and some common user code.

If the name is changed, it's easy to support the deprecated name from C.
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