dolfin team mailing list archive

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

Anders Logg wrote:
> On Thu, Sep 11, 2008 at 02:51:41PM +0100, Garth N. Wells wrote:
> > Martin Sandve Alnæs wrote:
> > > I don't agree, isn't the point that several DiscreteFunctions can
> > > share a FunctionSpace?
> > Yes, but a dof map doesn't define a function space.
> >
> > Garth
>
> I think the dof map should be in the FunctionSpace, that way several
> functions may share the dof map (which may take time to compute if we
> want to do some reordering).
>
> Two functions in the same function space share the mesh, the element
> and the dof map (these three define the space) but each function has
> its own vector.

My point isn't that a DofMap won't shared, it's that it's not part of 
the definition of a function space.

It always possible that two discrete functions which are equivalent can 
share a mesh and finite element (which defines the function space), but 
have different vectors and dof maps.

> I added the FiniteElement class to avoid exposing ufc:: classes
> directly. We do the same for ufc::dof_map (but then we have a reason).
> It might not be necessary, but it looked more uniform to have
>
>   (Mesh, FiniteElement, DofMap)
>
> instead of
>
>   (Mesh, ufc::finite_element, DofMap)

Sure. I just can't find where FiniteElement is defined?

Garth

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