dolfin team mailing list archive

["Garth N. Wells" <g.n.wells@xxxxxxxxxx>]

Quoting Anders Logg <logg@xxxxxxxxx>:

> On Thu, Apr 05, 2007 at 02:07:27PM +0200, Garth N. Wells wrote:
> > The code in ConstantFunction::interpolate does look right to me. 
> > Shouldn't it just return "value"?
> > 
> > Garth
>

Sorry, "does" should have been "doesn't". Should ConstantFunction be working or
not? It doesn't appear to be working at the moment.

Garth

 
> Yes, in simple cases where dofs are just point evaluation, but in
> general the values of the dofs may differ from the point values.
> 
> For example, a BDM1 element has dofs given by point evaluation (at
> certain points) of the normal components and the normal component of a
> vector-valued function at a point on the edge of a triangle may be
> different from its point value at that point.
> 
> Currently, FFC is only able to generate evaluate_dof() for Lagrange
> and vector-valued Lagrange, so right now, the extra work of going
> through evaluate_dof does not buy us anything more than just putting
> "value" into "coefficients". (But this will change when evaluate_dof()
> gets implemented for other elements in FFC.)
> 
> /Anders
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