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[Anders Logg <logg@xxxxxxxxx>]

It's not broken. It's a feature. :-)

You need to do

    element = MixedElement([U, C, E])

This is because we can have nested mixed elements. When you write

    element = U + C + E

you will get

    element = (U + C) + E

so it will be a mixed element consisting of two elements and the first 
of those will be mixed.

/Anders


Garth N. Wells wrote:
> Mixed elements with more than two fields appear to be broken.
>
>    C = FiniteElement("Lagrange", "triangle", 1)
>    U = FiniteElement("Lagrange", "triangle", 1)
>    E = FiniteElement("Lagrange", "triangle", 1)
>    element = U + C + E
>
>    (v0, v1, v2) = TestFunctions(element)
>
> gives the error
>
>    Traceback (most recent call last):
>      File "/usr/bin/ffc", line 180, in <module>
>        sys.exit(main(sys.argv[1:]))
>      File "/usr/bin/ffc", line 107, in main
>        execfile(outname, ns)
>      File "test.py", line 15, in <module>
>        (v0, v1, v2) = TestFunctions(element)
>    ValueError: need more than 2 values to unpack
>
> Garth
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