ffc team mailing list archive

[Kristian Oelgaard <k.b.oelgaard@xxxxxxxxxx>]

Quoting kent-and@xxxxxxxxx:

> > Quoting "Garth N. Wells" <gnw20@xxxxxxxxx>:
> >
> >>
> >>
> >> FFC wrote:
> >> > One or more new changesets pushed to the primary ffc repository.
> >> > A short summary of the last three changesets is included below.
> >> >
> >> > changeset:   1612:de211a9d88bce134c4abc2b128283ad35415a529
> >> > tag:         tip
> >> > user:        "Kristian Oelgaard <k.b.oelgaard@xxxxxxxxxx>"
> >> > date:        Tue Aug 18 17:57:36 2009 +0100
> >> > files:       ffc/fem/finiteelement.py
> >> > description:
> >> > Restrictions appears to be working for the Poisson demo.
> >> >
> >>
> >> Nice. What does the UFL syntax look like?
> >
> > scalar  = FiniteElement("CG", triangle, 3)
> > vector  = VectorElement("CG", triangle, 3)
> >
> > #element = scalar
> > #element = scalar["interval"]
> > #element = scalar[interval] + scalar
> > element = vector[interval]
>
> What does this mean ?

It's related to this thread

http://www.fenics.org/pipermail/ffc-dev/2009-July/002726.html

the 'scalar' element will have 10 dofs, 3 at the vertices 6 on the edges and 1
inside the cell.

element = scalar[interval]

will not have the dof which is inside the cell, it is restricted to the facets
(which is interval in this case).

Kristian

> Kent
>
> >
> > v = TestFunction(element)
> > u = TrialFunction(element)
> >
> > a = inner(grad(v), grad(u))*dx
> >
> > They should all work.
> >
> > evaluate_basis and evaluate_basis_derivatives is not implemented for
> > restricted
> > elements. The reason is that I'm not sure about what should happen when I
> > throw
> > away basisfunctions.
> >
> > Kristian
> >
> >> Garth
> >>
> >> >
> >> > changeset:   1611:283c1799fe643b297668dfa5347a7de50fee8555
> >> > user:        "Kristian Oelgaard <k.b.oelgaard@xxxxxxxxxx>"
> >> > date:        Tue Aug 18 17:40:05 2009 +0100
> >> > files:       ffc/fem/finiteelement.py ffc/fem/quadratureelement.py
> >> > description:
> >> > Bug fix to make buildbot happy.
> >> >
> >> >
> >> > changeset:   1610:2d95d63e8281e4f06cb9a24f1895b6e70563d1c5
> >> > user:        "Kristian Oelgaard <k.b.oelgaard@xxxxxxxxxx>"
> >> > date:        Tue Aug 18 17:09:17 2009 +0100
> >> > files:       ffc/compiler/evaluatebasis.py
> >> ffc/compiler/finiteelement.py
> >> ffc/fem/createelement.py ffc/fem/finiteelement.py
> >> > description:
> >> > A first implementation of restrictions work for FiniteElements.
> >> >
> >> > ----------------------------------------------------------------------
> >> > For more details, visit http://www.fenics.org/hg/ffc
> >> > _______________________________________________
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> >>
> >
> >
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>
>