docs for MINRES, only for positive definite?

[Barry Smith]

    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 at gmail.com>:
>> 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
>