Dear All, Given a finite element function f = \sum a_i \phi_i, I need to calculate the spatial derivatives df/dx_i, or at least a decent approximation of this function, preferably with an other FE-function as result. In the documentation, I have only succeeded in finding the ApproximateDerivative class, which, while sounding promising, seems to only calculate derivative norms. Can someone point me to an efficient way of calculating just the regular derivatives, i.e. the gradient?
Thanks very much in advance! Best regards, -- Med venlig hilsen, James Avery <[email protected]> _______________________________________________ dealii mailing list http://poisson.dealii.org/mailman/listinfo/dealii
