fiat team mailing list archive

["Robert Kirby" <robert.c.kirby@xxxxxxxxx>]

1.) It will get rid of all of the if numbering == "UFC" type code that has
been inserted into FIAT.   These ifs are difficult to maintain and have
crept into several parts of the code.2.) Within FFC, you will instantiate a
FIAT "ReferenceElement" such as
FIAT.reference_element.UFCTriangle() and pass that to the constructor for
the particular finite element.  Inside, it will automatically handle the
transformations and ordering.

On Jan 22, 2008 12:17 PM, Marie E. Rognes <meg@xxxxxxxxxxx> wrote:

> Robert Kirby wrote:
> > This should replace the transformed spaces.  FIAT's client would say
> > that they want a 5th order Lagrange over such and such a reference
> > element.  I would provide the "old" reference element and the UFC
> > reference element as particular cases.
> >
>
>
> How does this differ from the setup before the transformed spaces?
>
> --
> Marie
>
> > We were facing problems in both geometry and topology in the FFC/FIAT
> > hookup.  The numbering.py module attempted to solve the topology
> > problem and the transformedspace.py module the geometry problem.
> >
> > I think we should be able to have a single point of entry for all the
> > geometry & topology information about reference elements in FIAT.
> >
> > On Jan 22, 2008 11:58 AM, Anders Logg <logg@xxxxxxxxx
> > <mailto:logg@xxxxxxxxx>> wrote:
> >
> >     On Tue, Jan 22, 2008 at 11:48:23AM -0600, Robert Kirby wrote:
> >     > Hi, with all of the difficulties regarding (0,1) vs (-1,1) and
> >     handling
> >     > different kinds of reference orderings,
> >     > we seem to have scattered reference element info in about 3
> >     different modules.
> >     >  It might be a good time
> >     > to refactor some of this.  I propose having a "ReferenceElement"
> >     class that
> >     > will encapsulate the
> >     > geometry and topology of the particular reference elements,
> >     parametrizing the
> >     > rest of FIAT on top of
> >     > this.  This will make FIAT much cleaner and more extensible for
> >     people who want
> >     > other orderings.
> >     >
> >     > Rob
> >
> >     Is this instead of or in addition to the transformed spaces?
> >
> >     If instead of, this is what we started out with (trying to
> parametrize
> >     FIAT over the reference element).
> >
> >     At some point, we may also want to think of having some common
> module
> >     or interface for finite elements. Now, each of FIAT, SyFi, FFC, UFC
> >     and UFL have a FiniteElement class of their own, some of which are
> >     wrappers for the others.
> >
> >     --
> >     Anders
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> >
> >
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