Re: docs for MINRES, only for positive definite?

[Barry Smith <bsmith@xxxxxxxxxxx>]

   But does it require a positive definite preconditioner?

   Barry

On Feb 28, 2008, at 9:32 AM, Matthew Knepley wrote:

> Docs are wrong.
>
>  Matt
>
> 2008/2/28 Lisandro Dalcin <dalcinl@xxxxxxxxx>:
> > I've noticed that the docs for MINRES say that the operator and the
> > preconditioner must be POSITIVE DEFINITE. But I understand MINRES is
> > tailored for the symmetric/hermitian-indefinite case.
> >
> > Are the docs wrong? Or the actual code is a (very peculiar) MINRES  
> > variant?
> >
> >
> > --
> > Lisandro Dalcín
> > ---------------
> > Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)
> > Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
> > Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)
> > PTLC - Güemes 3450, (3000) Santa Fe, Argentina
> > Tel/Fax: +54-(0)342-451.1594
>
>
>
> --
> 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