In hindsight I could've written something simpler.
Here it is:
--------------------------------------------------------------------------------------------
#include <deal.II/base/tensor_function.h>
#include <deal.II/numerics/vector_tools.h>
using namespace dealii;
template <int dim>
class Exact : public TensorFunction<1, dim>
{
public:
Exact() : TensorFunction<1, dim>(dim)
{}
virtual Tensor<1, dim> value(const Point<dim> &p) const override;
virtual Tensor<2, dim> gradient(const Point<dim> &p) const override;
};
template <int dim>
Tensor<1, dim> Exact<dim>::value(const Point<dim> &p) const
{
return Tensor<1, dim>();
}
template <int dim>
Tensor<2, dim> Exact<dim>::gradient(const Point<dim> &p) const
{
return Tensor<2, dim>();
}
int main()
{
const int dim = 2;
Exact<dim> exact_solution;
VectorFunctionFromTensorFunction<dim>
exact_solution_vector_function(exact_solution,
0, dim);
Point<dim> p1;
exact_solution_vector_function.value(p1);
exact_solution_vector_function.gradient(p1);
return 0;
}
--------------------------------------------------------------------------------------------
I get this error when I call the exact_solution_vector_function.gradient
(p1):
!ERROR Message:
*An error occurred in line <135> of file
</home/abbas/dealii-candi/deal-II/dealii/include/deal.II/base/function.templates.h>
in function dealii::Tensor<1, dim, Number> dealii::Function<dim,
RangeNumberType>::gradient(const dealii::Point<dim>&, unsigned int) const
[with int dim = 2; RangeNumberType = double]The violated condition was:
falseAdditional information: You (or a place in the library) are trying
to call a function that is declared as a virtual function in a base
class but that has not been overridden in your derived class.*
Calling value works fine but not gradient even though I have overridden
both functions.
On Friday, July 14, 2023 at 8:55:34 PM UTC+2 Wolfgang Bangerth wrote:
> On 7/14/23 09:34, Abbas Ballout wrote:
> > // THis throws exception
> > VectorTools::integrate_difference(dof_handler,
> > solution,
> > exact_solution_vector_function,
> > difference_per_cell,
> > quadrature_formula,
> > VectorTools::H1_seminorm);;
>
> Well, what's the error message? A good rule of thumb is that 50% debugging
> consists of carefully reading what the error message says.
>
> Best
> W.
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth email: bang...@colostate.edu
> www: http://www.math.colostate.edu/~bangerth/
>
>
>
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