Fem-fenics : gradient evaluation at arbitrary point

[arnaudl]

Hi,

I hope this help-list is the good one.

I solve a classical Elasticity problem using Lagrange Element of order 1
obtaining the discrete solution "u".
Using Python version of FENICS, It seems one has just to use "grad(u)" to
evaluate the gradient of the computed solution at any arbitrary point (x,y)
for post-processing.
This gradient is discontinous.
I'd like to do the same with Fem-Fenics but such a function "grad" seems not
to be defined. 
Is there any simple solution to evaluate, at any arbitray point, the
gradient field of a finite element solution using Fem-Fenics ?

Thanks

Aranud



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