dolfin team mailing list archive

[Johan Hake <johan.hake@xxxxxxxxx>]

On Tuesday May 31 2011 09:41:18 Praveen C wrote:
> Question #159771 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/159771
> 
> Praveen C gave more information on the question:
> I know I can interpolate and Expression and then take grad. But I am
> looking to see if there is some automatic differentiation of an
> Expression available in dolfin.

No. The expression is only evaluated during an assemble. You need to project 
the grad of your expression to get the derivatives.

  der = project(grad(e), V)

where V is the space you would like to project your function into.

Johan