dolfin team mailing list archive

[Marie Rognes <663949@xxxxxxxxxxxxxxxxxx>]

On 20. okt. 2010 17:46, Garth Wells wrote:
> I'm not sure what's being reported here. Would you expect a more
> informative error? To me it's correct that an error is thrown since in
> UFL 'derivative' -> directional derivative.
>
>   

UFL also supports

    derivative(F, u)

by creating a TrialFunction du and calling derivative(F, u, du).

I would expect this to also be supported by dolfin ->  cf Johan's reply.

--
Marie

-- 
Form assembly crashes for derivative without 3rd argument
https://bugs.launchpad.net/bugs/663949
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Status in DOLFIN: New

Bug description:

Reproduce with:

mesh = UnitSquare(1, 1)
V = FunctionSpace(mesh, "CG", 1)
u = Function(V)
v = TestFunction(V)
F = u*v*dx
a = derivative(F, u)
A = assemble(a)