dolfin team mailing list archive

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

Johan Hake wrote:
> On Wednesday 30 September 2009 09:58:01 Garth N. Wells wrote:
> > Anders Logg wrote:
> > > On Tue, Sep 29, 2009 at 10:00:59PM +0100, Garth N. Wells wrote:
> > > > > 2. Use the Expression class in demos where appropriate (just need to
> > > > > change the class name, everything else is the same).
> > > > Haven't you already done this everywhere?
> > > No, just in the Poisson demo. I'll fix the others later.
> > Any thoughts on how to deal with Dirichlet bcs? Constant works because
> > it is a subclass of Function. Do we need a common base class for
> > Function and Expression which has an eval function?
>
> Yes, isn't this natural? It is at least nice to have the possibility to call 
> eval on a Function using interpolating. 
>
> I suppose it is enough to only provide the simple eval(value,x) function?

Anders is one step ahead of us - he added the class Coefficient which has:

   virtual void eval(double* values, const double* x) const;

   virtual void eval(double* values, const Data& data) const;

   virtual void restrict(double* w,
                          const FiniteElement& element,
                          const Cell& dolfin_cell,
                          const ufc::cell& ufc_cell,
                          int local_facet) const;

   virtual void evaluate(double* values,
                          const double* coordinates,
                          const ufc::cell& cell) const;

Garth

> Johan
>
> > Garth
> >
> > > --
> > > Anders
> > >
> > > > Garth
> > > >
> > > > > 3. Fix Python interface.
> > > > >
> > > > > I won't be touching it until tomorrow afternoon so feel free to poke
> > > > > around.
> > > > ------------------------------------------------------------------------
> > > >
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