[petsc-users] snes + matrix free + coloring

[panourg at mech.upatras.gr]

Is exactly the same.

Kostas






> 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
>>
>>
>