dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Fri, Oct 31, 2008 at 10:12:03AM +0000, Garth N. Wells wrote:
> 
> 
> DOLFIN wrote:
> > One or more new changesets pushed to the primary dolfin repository.
> > A short summary of the last three changesets is included below.
> > 
> > changeset:   5053:a37ad63c855383fa6aae8b15bf20720b1a96398f
> > tag:         tip
> > user:        Anders Logg <logg@xxxxxxxxx>
> > date:        Thu Oct 30 18:53:36 2008 +0100
> > files:       demo/pde/poisson/cpp/main.cpp dolfin/fem/DirichletBC.cpp dolfin/function/Constant.cpp dolfin/function/Constant.h dolfin/function/Function.cpp dolfin/function/Function.h
> > description:
> > Make Constants work (only scalar constructors added so far)
> >
> 
> It would make things simple if we stick to scalar constants and I would 
> be happy with that. Constant vector functions for which all components 
> are equal are easy too, but not all that useful. Anything else, like a 
> vector [0, 1] will required a FiniteElement to guarantee the correct 
> tabulation, right?
> 
> Garth

That's not a problem. The FunctionSpace for a Constant will be
discovered automatically.

If a Constant is used in a Form (a.c = c), then the FunctionSpace will
be created automatically.

If a Constant is used in a DirichletBC, then the FunctionSpace is
known (but will not be assigned to the Constant since it is const).

-- 
Anders

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