[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: matrix free for linear solver
- To: petsc-users@xxxxxxxxxxx
- Subject: Re: matrix free for linear solver
- From: "Lisandro Dalcin" <dalcinl@xxxxxxxxx>
- Date: Mon, 3 Mar 2008 15:26:30 -0300
- Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; bh=R7ka+eDFEqI0NHceYrr6EmHpNI3jJCsJU2/Km3IvRNM=; b=uIpdc8G4c/QGQReMp+Ji9Hg2aAgecP1YlDqhSmu4+xeVCZrAYVM1xpZTTnP/LvrvJiIe6VYXrmY4X0AKXzqBTs6y/f2CRz5lqJZqi6c//fp9nxUq0VNpvIE/LQHSZtO74EpuxL7ufTHPpZcaaM3ythB3JRdSEGVixN2bHWecSFM=
- Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=Pmv/sckztWdFEpLCxU1OmHF2vRtuF0sUeYi9Y9gDH3aZ2iOoMUStqZxRT0j5xNvgzLm/kSLJX+5lXTp+ID2JNHmMHobSQ6xj2V4hT+WisCr3cbMlxRaWLpPOakG6zSmu+NvUjMldggDAQl6OtjZPsLVXDEfkiA82NDLSONjXLhY=
- In-reply-to: <826323.76252.qm@web36811.mail.mud.yahoo.com>
- References: <a9f269830803030907r4e73c111gb7558bc2755bee75@mail.gmail.com> <826323.76252.qm@web36811.mail.mud.yahoo.com>
- Reply-to: petsc-users@xxxxxxxxxxx
- Sender: owner-petsc-users@xxxxxxxxxxx
On 3/3/08, li pan <li76pan@xxxxxxxxx> wrote:
> Now my question is, if the SNES method includes a JFNK
> method to solve the linear equation, why can't I use
> it for my linear equation directly? And how?
Sorry, I'm a bit confused. Are you trying to solve a linear or a
nonlinear problem? What are you exactly trying to do?
>
> thanx
>
> pan
>
>
>
> --- Matthew Knepley <knepley@xxxxxxxxx> wrote:
>
> > On Mon, Mar 3, 2008 at 11:05 AM, li pan
> > <li76pan@xxxxxxxxx> wrote:
> > > Dear all,
> > > If I want to solve a linear equation in matrix
> > free
> > > scheme, how is the command line argument? I only
> > know
> > > for nonlinear solver it is _snes_mf
> >
> > What do you mean here? How do you have linear
> > equations without
> > a matrix? If you mean that you would only like to
> > specify the action
> > of the operator, you should use MATSHELL.
> >
> > Matt
> >
> > > thanx
> > >
> > > pan
> > >
> > >
> > >
> > >
> >
> ____________________________________________________________________________________
> > > Looking for last minute shopping deals?
> > > Find them fast with Yahoo! Search.
> >
> http://tools.search.yahoo.com/newsearch/category.php?category=shopping
> > >
> > >
> >
> >
> >
> > --
> > 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
> >
> >
>
>
>
>
> ____________________________________________________________________________________
> Never miss a thing. Make Yahoo your home page.
> http://www.yahoo.com/r/hs
>
>
--
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