[petsc-users] function name and meaning of -pc_fieldsplit_schur_factorization_type

[Klaij, Christiaan]

> > 2) It would be nice to know what exactly is being dropped. <full>
> > is obvious and apparently <diag> drops the right most matrix, but
> > what do lower and upper drop?
> >
>
> http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/PC/PCFIELDSPLIT.html
>
>
> > 3) I'm confused about the minus sign in the <diag> form and its
> > motivation. It doesn't come from the factorization. Is the rhs
> > multiplied with a minus sign as well? Why not follow the sign
> > convention of Elman's taxonomy (eq 3 and 4, JCP 227, 2008)?
> >
>
> It makes the PC positive definite.
>
>   Matt

Thanks Matt, these petsc-dev manual pages are much clearer than current.


dr. ir. Christiaan Klaij
CFD Researcher
Research & Development
E mailto:C.Klaij at marin.nl
T +31 317 49 33 44

MARIN
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