ffc team mailing list archive

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

Anders Logg wrote:
> On Thu, Apr 26, 2007 at 05:02:18PM +0200, Garth N. Wells wrote:
> > When try to compile the code generated by FFC for the DOFLIN 
> > Cahn-Hilliard demo (src/demo/nls/cahn-hilliard/CahnHilliard2D.form) , I 
> > get the below errors related to undeclared variables.
> >
> > Garth
> >
> > CahnHilliard2D.h: In member function ‘virtual void 
> > UFC_CahnHilliard2DBilinearForm_cell_integral_0::tabulate_tensor(double*, 
> > const double* const*, const ufc::cell&) const’:
> > CahnHilliard2D.h:3136: error: ‘c3’ was not declared in this scope
> > CahnHilliard2D.h:3136: error: ‘c2’ was not declared in this scope
> > CahnHilliard2D.h:3136: error: ‘c1’ was not declared in this scope
> > CahnHilliard2D.h:4681: error: ‘c0’ was not declared in this scope
> > CahnHilliard2D.h: In member function ‘virtual void 
> > UFC_CahnHilliard2DLinearForm_cell_integral_0::tabulate_tensor(double*, 
> > const double* const*, const ufc::cell&) const’:
> > CahnHilliard2D.h:7572: error: ‘c3’ was not declared in this scope
> > CahnHilliard2D.h:7572: error: ‘c2’ was not declared in this scope
> > CahnHilliard2D.h:7572: error: ‘c1’ was not declared in this scope
> > CahnHilliard2D.h:9654: error: ‘c0’ was not declared in this scope
>
> I think the problem is that constants are no longer supported in
> UFC/FFC. They need to be mapped to DG(0) elements and this is something
> I haven't fixed yet.

Could you make it possible to invert DG(0) functions (e.g. 1/t)?

Garth

> In more detail: In FFC the keyword Constant() should just return a
> DG(0) function and on the DOLFIN side, one can create a corresponding
> constant function by
>
>     Function c(mesh, 3.0);
>
> for example.
>
> /Anders
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