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[Martin Sandve Alnæs <question153352@xxxxxxxxxxxxxxxxxxxxx>]

Question #153352 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/153352

Martin Sandve Alnæs proposed the following answer:
grad(f) == f.dx(0) only in the dev version of UFL.

Martin
Den 18. apr. 2011 22.58 skrev "Kristian B. Ølgaard" <
question153352@xxxxxxxxxxxxxxxxxxxxx> følgende:
> Question #153352 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/153352
>
> Status: Open => Answered
>
> Kristian B. Ølgaard proposed the following answer:
> On 18 April 2011 22:46, Chaffra <question153352@xxxxxxxxxxxxxxxxxxxxx>
wrote:
>> Question #153352 on DOLFIN changed:
>> https://answers.launchpad.net/dolfin/+question/153352
>>
>>    Status: Answered => Open
>>
>> Chaffra is still having a problem:
>> What would be a scalar, df?
>
> Yes, grad(f) == f.dx(0) as far as I know.
>
>>You should be able to define a vector field
>> on a 1D mesh?
>
> Yes, that should be possible.
>
>>It works when you specify dim=2 or 3 but  not when dim=1
>> or dim=None
>
> dim=1 and dim=None will probably be the same since dim will be set
> equal to the geometric dimension of the cell, 1D in this case.
> I could very well be bug in ffc, I would just expect the MixedElement
> from UFL to reduce to a FiniteElement if it contained only one
> element.
>
> Kristian
>
>>
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