[dune-functions] Problems writing vector-valued vtk files

[Oliver Sander]

>> I kind-of see where the problem is coming from: I would expect the Range type of xFunction and localXFunction to be
>> FieldVector<double,3>.  However, in discretescalarglobalbasisfunction.hh the type for both is set to the range type
>> of the LocalBasis, which is FieldVector<double,1>.  This leads to a mismatch during function evaluation.
> that's correct (in some sense). I just adpated the old version, which
> was inherently scala, to the new interface. I guess that's why it has
> ...Scalar... in its name. 

One could argue that it is called ...scalar... because it uses scalar bases,
even to create vector-valued functions.  I'm not perfectly sure that this is
a good long-term point of view.


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