Gabriel,
[...]
> u_x.reinit(n_dofs_in_one_direction);
> *FEValues<dim> fe_values(fe,
> quadrature_formula, update_values);*
> *std::vector<Tensor<1, dim>> velocity_values(n_q_points);*
> *const FEValuesExtractors::Vector velocities(0);*
>
> *for (const auto &cell : dof_handler.active_cell_iterators())*
> * {*
> * fe_values.reinit(cell);*
> * fe_values[velocities].get_function_values(solution,
> velocity_values);*
>
> * [...]*
>
> *}*
>
> With this procedure I get the vector of Tensors velocity_values, which
> contains the velocity-values of "solution" in every direction at the
> quadratue points. So now I an easily get the values of velocity_values in
> the x-direction at the quadrature points. But how do I get the values of
> u_x at the dofs?
>
> Does somebody have an idea how to fix this, or a better way to do handle
> this?
>
You can use
fe.system_to_component_index(i).first;
to obtain the component of the local degree with number i, see
https://www.dealii.org/current/doxygen/deal.II/step_8.html#ElasticProblemassemble_system
.
Best,
Daniel
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