ffc team mailing list archive

[Martin Sandve Alnæs <martinal@xxxxxxxxx>]

By default, the variables "M", "L", and "a" are checked
and used if they are Form instances. Otherwise, any set
of forms (and elements) can be exported by defining lists
with the instances in:

  V = FiniteElement(...)
  ...
  a = ...*dx
  forms = (a, L, F, J)
  elements = (V, P, TH)

I'll update the manual.

Martin



On Sun, Jun 7, 2009 at 9:59 AM, Garth N. Wells<gnw20@xxxxxxxxx> wrote:
> I couldn't find in the UFL manual whether or not there is something
> special about 'a' and 'L' denoting bilinear and linear forms,
> respectively, or if this determined by the form compiler?
>
> Either way, it seems that some checks are missing in either UFL or FFC
> since
>
>   element = FiniteElement("Lagrange", triangle, 1)
>   v = TestFunction(element)
>   u = TrialFunction(element)
>   f = Function(element)
>
>   a = inner(grad(v), grad(u))*dx + v*f*dx
>
> doesn't result in an error. I would expect this to give an error.
>
> Garth
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