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["Garth N. Wells" <gnw20@xxxxxxxxx>]

Martin Sandve Alnæs wrote:
> UFL supports absolute values of any scalar expression.

Very good. It's not currently supported by FFC.

Garth

> Martin
>
>
>
> On Wed, Dec 31, 2008 at 8:46 PM, Garth N. Wells <gnw20@xxxxxxxxx> wrote:
> > Since FFC is about to move to UFL, I guess this is the best place to ask
> >  certain questions now ;).
> >
> > Will UFL support the absolute value of sums, e.g.
> >
> >   vector = VectorElement("Lagrange", "tetrahedron", 1)
> >   scalar = Element("Lagrange", "tetrahedron", 1)
> >   v = TestFunction(scalar)
> >   u = Function(vector)
> >   n = Function(vector)
> >
> >   L =  v*abs(inner(u, n))*ds
> >
> > This would be useful for upwinding fluxes.
> >
> > Garth
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