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

[Oliver Sander]

Am 19.03.2015 um 10:12 schrieb Carsten Gräser:
> Am 18.03.2015 um 22:14 schrieb Christian Engwer:
>> This would become easier when introducing tensors ;-)
> Perhaps. However I still think that the user will have
> to decide in the nontrivial cases.

In non-trivial situations that's fine, though.

> 
> Carsten
> 
>> Christian
>>
>> On Wed, Mar 18, 2015 at 04:18:30PM +0100, Carsten Gräser wrote:
>>> Am 18.03.2015 um 16:13 schrieb Oliver Sander:
>>>>>> 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.
>>>>> In the long-term we should get rid of 'scalar'. The only thing
>>>>> to specify is how to multiply coefficients and values of the local
>>>>> basis. Maybe we can factor this out in a first step such that one
>>>>> can povide this as a lambda.
>>>>
>>>> I've been thinking along the same lines.  Getting rid of the 'scalar' would be nice;
>>>> the users shouldn't have to worry about scalar and nonscalar bases too much.
>>> I'm afraid he has to. Because if coefficients and basis functions are
>>> vector-valued, there's no longer a canonical range type for the
>>> function. It get's even worse, for matrix valued coefficents.
>>>
>>> Best,
>>> Carsten
>>>
>>>>
>>>>>
>>>>> For the moment I've implemented support for vector/matrix-valued
>>>>> coefficients only.
>>>>
>>>> Works-for-me, thanks!
>>>>
>>>>>
>>>>> Best,
>>>>> Carsten
>>>>>
>>>>> BTW:
>>>>> Generic multiplication of various matrix/vector/scalar
>>>>> combinations is something we've put a significant amount of
>>>>> work into in dune-fufem.
> 
> 
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