[petsc-users] using PCFieldSplitGetSubKSP in c++

[Jed Brown]

On Wed, Mar 14, 2012 at 07:47, Matthew Knepley <knepley at gmail.com> wrote:

> I thought MatSchurComplement() made the original matrix available?
>

Not sure what you mean. The submatrices are inside a MatSchurComplement.
But the user doesn't get access to the Schur complement to set near-null
spaces.


> I still disagree with this for
> MatGetSubMatrix() since it will create a nightmare for references. I am
> still tracking down a
> reference bug in FS when you use a custom preconditoner for Schur.
>

FieldSplit in petsc-dev has some new bugs, Jungho is working on them.
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