A motivating example would be Landau-Lifshitz-Gilbert equation which models 
magnetization in a solid.

On Sep 15, 2010, at 5:48 PM, Wolfgang Bangerth wrote:

> 
>> I'm working on a problem at the moment where it would be useful to have a
>> FEValuesExtractors::Vector of arbitrary dimension (in particular,
>> dimension 3), independent of the working dimension of the dimension of the
>> underlying FEValues object.
>> 
>> Will such a feature be easy to add?
> 
> Yes. I guess the bigger question is what you want to do with it and 
> consequently why you need this feature. For example, what would be the 
> natural 
> type for the value of such an extractor?
> 
> Can you explain?
> 
> Best
> W.
> 
> 
> -------------------------------------------------------------------------
> Wolfgang Bangerth                email:            [email protected]
>                                 www: http://www.math.tamu.edu/~bangerth/

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