dolfin team mailing list archive

[Kent-Andre Mardal <kent-and@xxxxxxxxx>]

It is not implemented in SFC, I don't think it is implemented properly in
FFC either, but I am not sure.

Kent

On 8 April 2011 13:19, Jack Hale <j.hale09@xxxxxxxxxxxxxx> wrote:

> Hi,
>
> I've been looking to compare some approaches to solving the biharmonic
> problem (mixed and primal weak forms) that appears in areas such as
> plate bending. The primal formulation requires a subspace of H^2 to be
> constructed.
>
> It seems that when I try to declare something like:
>
> V_3 = df.FunctionSpace(mesh, "Hermite", None)
>
> I get the error:
>
> RuntimeError: *** Error: Illegal degree for creation of function
> space, not an integer: None
>
> And upon the declaration to:
>
> V_3 = df.FunctionSpace(mesh, "Hermite", 1)
>
> I get the error:
>
> ufl.log.UFLException: Degree "1" invalid for "Hermite" finite element,
> should be None
>
> I can see that the element has been implemented in both SyFi and FIAT,
> but has it been implemented in SFC/FFC and Dolfin? If not (and I'm not
> sure I have the skills to help, but would like to know) what needs to
> be done to finish the implementation through to the Dolfin level?
>
> Thanks for your help,
>
> Jack Hale
> Department of Aeronautics
> Imperial College London
>
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