dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Sun, Nov 02, 2008 at 06:29:25PM +0000, Garth N. Wells wrote:
> 
> 
> Anders Logg wrote:
> > On Sun, Nov 02, 2008 at 05:52:21PM +0000, Garth N. Wells wrote:
> >> Do we want to insist that Dirichlet bc functions that do not appear 
> >> inside a form are constructed with a FunctionSpace? DirichletBC is 
> >> supplied with a FunctionSpace, so if the bc Function does not have a 
> >> FunctionSpace, we could attach one automatically.
> >>
> >> Garth
> >> _______________________________________________
> >> DOLFIN-dev mailing list
> >> DOLFIN-dev@xxxxxxxxxx
> >> http://www.fenics.org/mailman/listinfo/dolfin-dev
> > 
> > I think this is already handled. Look in the Poisson demo. It uses a
> > Constant to set the BC and it does not have a FunctionSpace attached
> > to it. The DirichletBC class now uses its own FunctionSpace rather
> > than the one that the Function has (if any). There is a check (in
> > DirichletBC::check()) that checks that the FunctionSpace for the
> > Function is the same as the one in the DirichletBC.
> > 
> 
> It works for Constant, but not for Functions. I was getting an error 
> when Function::interpolate is called. Function::interpolate leads to 
> eval being called, in which case there is a test for the FunctionSpace 
> which fails. Constant provides its own eval and therefore doesn't have a 
> problem.
> 
> For now, I've added a test in DirichletBC for the FunctionSpace. What we 
> can add is an attach function if there is no FunctionSpace associated.
> 
> Garth

In which demo does this show up? Is there a simple way I can comment
something out to reproduce the error so I understand what goes wrong?

-- 
Anders

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