[petsc-users] MATNEST with shell matrices

[Amneet Bhalla]

Can you guys comment on what example case would be best to start off for
shell
operators with FieldSplit? The examples I am looking into all start with
creating native
PETSc matrices and vectors.

If possible could you write down steps that would be needed in setting such
system...

a) Create matrices using XXXX (?) b) Create vectors using YYYY ....

On Thu, Feb 21, 2013 at 3:24 PM, Matthew Knepley <knepley at gmail.com> wrote:

> On Thu, Feb 21, 2013 at 4:20 PM, Amneet Bhalla <mail2amneet at gmail.com>wrote:
>
>>
>> On Thu, Feb 21, 2013 at 2:57 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
>>
>>> that you're happy with and that performs well with fieldsplit or custom
>>> preconditioning that will be amenable to your MatShells
>>
>>
>> Is fieldsplit an alternative approach to MatNest and VecNest? The problem
>> is that I am working on nonnative PETSc
>> data; so I am not sure which recent methods would support shell approach.
>> All I want is to use PETSc's algorithm
>> for solving multicomponent system of equation. I am not bothering about
>> preconditioning yet, as I will be trying
>> a custom preconditioner down the road.
>>
>
> MatNest is just an optimization matrix format. Get your stuff working with
> FieldSplit and then think about optimization.
>
>    Matt
>
>
>>
>> --
>> Amneet
>>
>>
>>
>>
>
>
> --
> 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
>



-- 
Amneet
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