petsc-users Digest, Vol 9, Issue 3

[Matthew Knepley]

On Thu, Sep 3, 2009 at 12:54 PM, xiaoyin ji <sapphire.jxy at gmail.com> wrote:

> I thought the preconditioner with ksp solver is a vector where the
> solver start to iterate and solve...so my idea is if I could set a
> vector which is close to the solution as preconditioner, then ksp will
> do less iteration.
>

It is not. I suggest Yousef Saad's book Iterative Methods for Sparse Linear
Systems.

  Matt


> Xiaoyin Ji
>
> > By the way, will there be a way to set a PETSc vector directly into a
> >> preconditioner for the ksp solver?
> >>
> >
> > Do not know what you mean here.
> >
> >  Matt
> >
> >
> >> Thanks!
> >>
> >> Best,
> >> Xiaoyin Ji
> >>
> >> Department of Materials Science and Engineering
> >> North Carolina State University
> >>
> >
> >
> >
> > --
> > 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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-- 
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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