[petsc-dev] are petscfe tests functions dual or primal?

[Matthew Knepley]

On Fri, Jan 17, 2014 at 4:09 PM, Geoffrey Irving <irving at naml.us> wrote:

> Do the test functions we integrate against to form residuals with
> PetscFE come from the primal space or the dual space?  I.e., is
> PetscFE always Galerkin?  If it isn't always Galerkin, when would it
> be?
>

They come from the dual space. I do not think I have made any assumptions
that prevent Petrov-Galerkin, but I have also never tried an example.

You can see the code that does tabulation here:


https://bitbucket.org/petsc/petsc/src/cdce425498f34eac2bb744f37c9fe1bd5a97b9d8/src/dm/dt/interface/dtfe.c?at=master#cl-2317

   Matt


> Thanks,
> Geoffrey
>



-- 
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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