[petsc-users] snes + matrix free + coloring

[Jed Brown]

On Wed, Oct 10, 2012 at 3:32 PM, <panourg at mech.upatras.gr> wrote:

> Dear all
>
> I have a non-linear system which i want to solve it with matrix free
> method. However i must form the whole proconditioning matrix using finite
> differences and coloring method.
>

How is the preconditioning matrix different from the actual operator?


>
> I can set the function F() of non-linear system (i take the notation F()
> from documentation).
>
> Could you send me exactly the commands and the order of it which i must
> use or an apt example for that?
>
> I have looked for that in internet but i could not find any suitable
> example.
>
> Kostas
>
> Thanks
>
>
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