[petsc-users] Discretized fields at quadrature points

[Sander Arens]

What does it stand for? Discrete Gauss? Maybe PETSCSPACEQUADRATURE is a
better name?

The reason I want to use this is because these fields will be representing
a bunch of ODE's at each point (not coupled spatially) and it would be nice
if their mass matrices would be diagonal. So the dual space should be Dirac
delta's at the quadrature points and that's different from the default
(Lagrange).

I'll see if I can code something up for this. Any suggestions for a name
for this dual space?

Thanks,
Sander

On 8 April 2016 at 16:48, Matthew Knepley <knepley at gmail.com> wrote:

> On Wed, Apr 6, 2016 at 2:06 PM, Sander Arens <Sander.Arens at ugent.be>
> wrote:
>
>> Hi,
>>
>> I'd like to be able to represent some discretized fields at the
>> quadrature points of a finite element, so I can easily use them with the
>> plex residual/function evaluations. Is it possible to do this with
>> PetscFECreateDefault and some command line options?
>> I think what I need is PETSCSPACEDG for the space, but I'm not sure what
>> type I should take for the dual space?
>>
>
> This is why I put that in there. It really should not be named DG, but
> there are reasons I thought it made sense.
>
> I had not thought about a dual space, since I was not going to project
> into it. I think you can just use whatever is the default.
>
>   Matt
>
>
>> Thanks,
>> Sander
>>
> --
> 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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