Dear everyone,
I have trouble understanding in how to evaluate a solution at a given point
correctly.
Described in Step-3 for example the function point_value is used to
evaluate the solution at (0.3, 0.3), and I want to do something quite
similar.
However, my solution is vector valued (i.e. I use FESystem ), and I get the
following error message
>>An error occurred in line <181> of file
<./include/deal.II/numerics/vector_tools_point_value.templates.h> in
function
typename VectorType::value_type dealii::VectorTools::point_value(const
dealii::Mapping<dim, spacedim>&, const dealii::DoFHandler<dim, spacedim>&,
const VectorType&, const dealii::Point<spacedim>&) [with int dim =
2; VectorType = dealii::Vector<double>; int spacedim = 2; typename
VectorType::value_type = double]
The violated condition was:
dof.get_fe(0).n_components() == 1
Additional information:
Finite element is not scalar as is necessary for this function
However in the documentation it says "Evaluate a possibly vector-valued
finite element function defined by the given DoFHandler
<https://dealii.org/developer/doxygen/deal.II/classDoFHandler.html> and
nodal vector fe_function at the given point point". So I am curious how to
evaluate my solution at a few fixed points? Did I miss something?
Performance-wise it does not have to be perfect at all, as I want to
evaluate only ~400 points on a few hundered solutions (time-steps).
Best,
Jost
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