matrix free for linear solver

[Lisandro Dalcin]

On 3/3/08, li pan <li76pan at yahoo.com> 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 at gmail.com> wrote:
>
>  > On Mon, Mar 3, 2008 at 11:05 AM, li pan
>  > <li76pan at yahoo.com> 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
>  > >
>  > >
>  > >
>  > >
>  >
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-- 
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)
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