[petsc-users] jacobians for multicomponent problems

[Matthew Knepley]

On Tue, Jun 23, 2015 at 10:30 PM, Gideon Simpson <gideon.simpson at gmail.com>
wrote:

> Yes, is there and example for this?
>

src/ts/examples/tutorials/advection-diffusion-reaction/ex5.c

Thanks,

   Matt


> -gideon
>
> On Jun 23, 2015, at 11:05 PM, Matthew Knepley <knepley at gmail.com> wrote:
>
> On Tue, Jun 23, 2015 at 7:52 PM, Gideon Simpson <gideon.simpson at gmail.com>
> wrote:
>
>> Suppose I have a problem for which the field variable has multiple
>> components, in this case real and imaginary parts, and I have created a DM
>> with two degrees of freedom.  When assembling a Jacobian associated with a
>> nonlinear problem on this data, is there any data management accounting for
>> the different components that makes this “easier?”
>>
>
> DMDA knows about components so that MatStencil has a .c slot for indices.
> Is that what you mean?
>
>   Thanks,
>
>     Matt
>
>
>> -gideon
>>
>>
>
>
> --
> 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
>
>


-- 
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
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