[dune-functions] GridFunction interface

[Oliver Sander]

Am 20.03.2015 um 16:32 schrieb Christian Engwer:
> Hi Oli,
> 
>> I am not convinced either.  In fact I'd find 1) more unexpected than 2).
>> If I have a function that depends on some coordinates I'd expect its
>> derivatives to be wrt to these coordinates.  So if the function is a local
>> function I'd expect the derivatives to be wrt to local coordinates.
>> If I want them wrt global coordinates then I'd need to multiply by
>> JacobianInverseTransform.
> 
> No, the problem was/is that you don't know what to do, because it
> depends on your particular type of function. Or lets ask the other way
> around, what would your local function return in case of the RT0
> function. Would it already perform the piola transformation?

No.

> 
> Christian
> 


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