ffc team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

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.

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