ffc team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Sat, Dec 06, 2008 at 03:48:34PM +0000, Garth N. Wells wrote:
> It would be useful if we could somehow associate names with mixed 
> functions, e.g.
> 
>    P2 = VectorElement("Lagrange", "triangle", 2)
>    P1 = FiniteElement("Lagrange", "triangle", 1)
>    TH = P2 + P1
>    (u, p, "U") = Functions(TH)

Is it ever necessary to create a Functions that way?

TestFunctions and TrialFunctions are special since they correspond to
subsets of a bigger system, but for coefficients, one can just do

  u = Function(P2)
  p = Function(P1)

Even though it seems strange to name two coefficients "u" and "p" for
Stokes.

-- 
Anders


> so that in the DOLFIN-specific C++ wrapper code we can use
> 
>    a.U = u;
> 
> to attach mixed functions rather than
> 
>    a.w0 = u;
>    a.w1 = v;
>    etc.
> 
> which is error prone. Andy suggestions on a nice way to do this in the 
> FFC input? Will this be part of UFL?
> 
> Garth
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