ffc team mailing list archive

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

Such rules may best be put into FIAT, and then propogated into ffc.

Rob

On Mon, Jul 6, 2009 at 6:03 AM, Kristian Oelgaard
<k.b.oelgaard@xxxxxxxxxx>wrote:

> Quoting Kristian Oelgaard <k.b.oelgaard@xxxxxxxxxx>:
>
> > Quoting Peter Brune <prbrune@xxxxxxxxx>:
> >
> > > Some recent discussions and problems that have cropped up have led me
> to
> > > need/want to add some specialized quadrature rules to FFC.  These
> include
> > > "optimal" combinatorially-derived rules for given order polynomials for
> the
> > > n-simplex, as well as rules that can be explicitly guaranteed to have
> > > certain properties (positivity, all-internal-nodes, etc)
> > >
> > > Does anyone else need anything like this?  I already have
> implementations
> > of
> > > a few nice rules for higher-dimensional applications, but have started
> to
> > > adapt them for this purpose.  Ideally we would be able to specify a
> rule in
> > > the ffc command.  I'm looking at where to put this.
> >
> > So on the command line we should be able to do:
> >
> > ffc --quadrature-rule some_string
> > or
> > ffc -q some_string
> >
> > and then in the file ffc/fem/quadrature.py in the function
> > make_quadrature() there should be an extra argument
> >
> > make_quadrature(shape, n, quad_rule)
> >
> > with default None? Then you can just put your code and some switches in
> this
> > file.
> > I can add the command line option and propagate it to the
> make_quadrature()
> > function, at least for quadrature representation, if nobody objects.
>
> I added this to FFC, just add your rules to the make_quadrature() function.
>
> Kristian
>
> >
> > > There are other potential benefits to this move.  If we were to switch
> to
> > > rules we have definite information about, we could use, say, group
> symmetry
> > > properties, combined with symmetry properties of the unknowns, for
> further
> > > optimization of the form compilation by quadrature.  We would already
> win,
> > > especially in 3D, by getting away from the squashed rules and towards
> rules
> > > that are more optimal.
> >
> > This would be nice.
> >
> > Kristian
> >
> > > - Peter
> > >
> >
> >
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> >
>
>
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