Kristian Oelgaard wrote:
2010/1/27 Medhi Nikbakht <[email protected]>:
On Wed, 2010-01-27 at 15:50 +0100, Marie Rognes wrote:
FFC compilation fails for
ElementRestriction.ufl
The error message says that "ElementRestriction" is not supported by
FIAT.
How will the restricted elements be implemented? Wouldn't it be better
to support them inside FFC?
There are two types of restrictions supported in UFL (and the old FFC).
1) Restriction onto Measure (like 'dc'), which is what you want.
2) Restriction onto Cell, as for instance restricting a Lagrange
element defined on a 'triangle' to its facets.
The third restriction that we might want in the future is restriction
onto subdomains possible in UFL but not in FFC.
To implement 1) I think it is enough to just attach the Measure as a
member to the fiat_element and the simply look for it in appropriate
places when generating the code. That means handle it in
FFC.fiatinterface, could that work?
To implement 2) I modified the return value of entity_dofs() and
tabulate() accordingly. To do it this way again we will need to make
changes in FIAT_NEW.FiniteElement and FFC.MixedElement. I'm not sure
it is a good idea to make FIAT_NEW.PolynomialSet aware of
restrictions, but I don't know enough about the FIAT internals to back
up this claim.
How about adding a class RestrictedElement that contains an element and
(based on the restriction)
a list of relevant basis function indices, and overrides the methods as
FiniteElement/MixedElement?
No need to make FIAT aware of this.
--
Marie
I'm not really sure how to handle the restriction onto subdomains, but
it should most likely be implemented in FFC.
Kristian
Mehdi
QuadratureElement.ufl
TensorWeightedPoisson.ufl
Running test programs fails for
P5tet.bin (Segmentation faults after evaluate_basis(0, ...)
Differences in output
evaluate_basis*
FacetIntegrals.out (missing value in generated code (many))
SubDomain.out (missing value in generated code
(tabulate_tensor))
Others:
tabulate_entity_dofs (errors thrown are all wrong. Marie
will fix)
--
Marie
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