[petsc-users] zero diagonal values and Jacobi preconditioner

[Matthew Knepley]

On Tue, Nov 15, 2011 at 6:33 AM, Dominik Szczerba <dominik at itis.ethz.ch>wrote:

> Jacobi...
>

http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/docs/manualpages/PC/PCJACOBI.html

   Matt


> On Tue, Nov 15, 2011 at 1:22 PM, Matthew Knepley <knepley at gmail.com>
> wrote:
> > On Tue, Nov 15, 2011 at 5:17 AM, Dominik Szczerba <dominik at itis.ethz.ch>
> > wrote:
> >>
> >> What will happen if my matrix has (close to, or exactly) zeros on the
> >> diagonal? Does Petsc handle such cases smartly somehow or am I right
> >> to expect poor convergence (values close to zero) or failure (values
> >> exactly zero)?
> >
> > It would depend on what preconditioner you are using.
> >    Matt
> >
> >>
> >> Many thanks,
> >> Dominik
> >
> >
> >
> > --
> > What most experimenters take for granted before they begin their
> experiments
> > is infinitely more interesting than any results to which their
> experiments
> > lead.
> > -- Norbert Wiener
> >
>



-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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