[petsc-dev] Problem with assembly of Jacobian in ex12 & ex77

[Sander Arens]

What are you trying to do with it? I don't think there's more documentation
on how to use PetscFE than what's already in the online documentation and
in the examples.
What do you mean with "grasp the concept"?

Thanks,
Sander

On 27 June 2016 at 17:41, <rickcha at googlemail.com> wrote:

> That did do the trick with the examples, thank you. I am still struggling
> with my own simple example however. Is there any documentation available on
> how to use petscFE? I could not find anything besides the three examples.
> And I yet have to grasp the concept.
>
>
> Thanks in advance,
> M. Hartig
>
> On 27 Jun 2016, at 15:49, Sander Arens <Sander.Arens at ugent.be> wrote:
>
> I think you forgot to set the order of the finite element spaces, which
> default to 0. Does it work if you try for example ex77 with the following
> options found here?
> <https://bitbucket.org/petsc/petsc/src/8bc5349a152c81f25b59a9592e1e5936c01866af/config/builder.py?at=master&fileviewer=file-view-default#builder.py-562>
>
> Thanks,
> Sander
>
> On 27 June 2016 at 15:28, <rickcha at googlemail.com> wrote:
>
>> Dear Petsc developer team,
>>
>> while learning the ways of the petscFE I came across a curiosity I’d like
>> to point out to you. The Jacobians that are created from the petscFE object
>> seem to have only 0-entries (apart from the obviously empty regions) in
>> examples 12 and 77. That might be due to a limited understanding from my
>> side on how exactly petscFE and the mentioned examples work, but it struck
>> me as unusual.
>>
>> Thanks in advance,
>>
>> M. Hartig
>
>
>
>
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