ffc team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Sat, Dec 06, 2008 at 08:21:29PM +0000, Garth N. Wells wrote:
> 
> 
> Anders Logg wrote:
> > 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.
> >
> 
> With the above they won't share the same vector. It's common that the 
> Functions that are of interest in the form will come from solution, for 
> example, the solution at previous time steps.
> 
> Garth

ok, I think I get it.

-- 
Anders

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