[petsc-users] Assembling primal Schur matrix in FETI-DP method

[Thomas Witkowski]

Zitat von Jed Brown <jedbrown at mcs.anl.gov>:

> On Mon, Nov 21, 2011 at 04:00, Thomas Witkowski <
> Thomas.Witkowski at tu-dresden.de> wrote:
>
>> Some technical question on this point: How can I explicitly factorize a
>> sequential matrix? Is MatLUFactor the correct function to do it?
>
>
> In general, I recommend using the KSP. You can KSPSetType(ksp,KSPPREONLY),
> PCSetType(pc,PCLU). Call KSPSolve() multiple times, the factorization will
> be reused. Or you can use MatLUFactor() directly if you really want.
>
>

Okay, but how to make use of the KSP in MatMatSolve?