ufl team mailing list archive

[Kristian Oelgaard <k.b.oelgaard@xxxxxxxxxx>]

Quoting Harish Narayanan <harish.mlists@xxxxxxxxx>:

> Garth N. Wells wrote:
> >
> >
> > Harish Narayanan wrote:
> >> Martin Sandve Alnæs wrote:
> >>> I fixed _something_...
> >>>
> >>> Now I'm getting:
> >>>
> >>>
> >>> Visiting Zero: Zero((), (), {})
> >>> Zero is not supported (yet).
> >>>
> >>> *** FFC: Zero is not supported (yet).
> >>> *** FFC: To get more information about this error, rerun FFC with
> >>> --debug.
> >>>
> >>>
> >>> And sfc fails to compile the form for some other reason.
> >>
> >>
> >> I am just writing to note that the original form I was trying to compile
> >> where I noticed this error (it was not a system) is now working.
> >>
> >
> > What's the status of this? Is it critical enough to hold up a release
> > (more to the point, a release of all the other FEniCS components which
> > is long overdue)?
>
> I just checked this and the case that Martin mentioned (which has a zero
> rhs) still doesn't work.

I wouldn't call this a bug, it's just a missing implementation. We have a ton of
other things that are not implemented/supported yet, so if we have to wait for
all that, the release will never happen.
At least it crashes with a sensible error message.

Kristian

> cell = triangle
> d = cell.d
> I = Identity(d)
>
> vector = VectorElement("Lagrange", cell, 2)
> scalar = FiniteElement("Lagrange", cell, 1)
> element = vector + scalar
>
> v, q = TestFunctions(element)
> u, p = TrialFunctions(element)
>
> F = inner(grad(v), grad(u) - p*I)*dx
>
> #a = lhs(F)
> L = rhs(F)
>
> Harish
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