In the DataPostprocessor class, we have the following function,
void compute_derived_quantities_vector(
 const std::vector< Vector<Real> >& uh,
 const std::vector< std::vector<Tensor< 1, dim >> >& duh,
 const std::vector< std::vector<Tensor< 2, dim >> >& /*dduh*/,
 const std::vector< Point< dim > >& /*normals*/,
 const std::vector< Point< dim > >& /*evaluation_points*/,
 std::vector< Vector< Real > >& computed_quantities) const;

Normally, "uh" is just the solution I've got. Now how can I compute the 
"duh" from "uh"?

(I know that we can put such an object directly to 
DataOut<dim>::add_data_vector(), but in some cases, I would want the 
explicit fe function "duh")

Thanks!

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