Dear deal.ii group users,
I am debugging a program using the function *'get_generalized_support_points()'
*( where has_support_points()=0, while has_generalized_support_points()=1*)*.
My FE system is defined as *'FESystem<3> fe(FE_Nedelec<3>(0), 2);'*,
therefore, each active cell has 12*2 dofs. So I would also expect
'get_generalized_support_points()' can return the support points with a
vector of size 24 (of course the value will repeat once). However, it only
has 12 valid Point<3> values, the other 12 are zero or some crazy number.
My question is, is this reasonable, or there is sth wrong with my
understand on this.
For reference, attached pls find a script and its output results. To
simplify the problem, the mesh has only one cell .
Best regards,
Longying & Jochen
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#include <deal.II/grid/tria_accessor.h>
#include <deal.II/grid/tria_iterator.h>
#include <deal.II/grid/grid_tools.h>
#include <deal.II/grid/grid_generator.h>
#include <deal.II/distributed/tria.h>
#include <deal.II/numerics/data_out.h>
#include <deal.II/fe/fe_nedelec.h>
#include <deal.II/fe/fe_system.h>
#include <deal.II/base/conditional_ostream.h>
#include <deal.II/base/mpi.h>
#include <deal.II/distributed/grid_refinement.h> // For parallelization
#include <string>
#include <iostream>
using namespace dealii;
int main(int argc, char *argv[]) {
// MPI
Utilities::MPI::MPI_InitFinalize mpi_initialization(argc, argv, 1);
MPI_Comm mpi_communicator (MPI_COMM_WORLD);
ConditionalOStream pcout
(std::cout,Utilities::MPI::this_mpi_process(mpi_communicator) == 0);
const unsigned int this_mpi_process =
Utilities::MPI::this_mpi_process(mpi_communicator);
// make the grid
parallel::distributed::Triangulation<3> triangulation( mpi_communicator,
typename Triangulation<3>::MeshSmoothing
(
Triangulation<3>::limit_level_difference_at_vertices ));
DoFHandler<3> dof_handler(triangulation);
std::vector<unsigned int> repetitions(3, 1);
GridGenerator::subdivided_hyper_rectangle(triangulation, repetitions,
Point<3>(0,0,0), Point<3>(100,100,100));
pcout << "\t\tNumber of active cells : "
<< triangulation.n_global_active_cells()
<< std::endl ;
FESystem<3> fe(FE_Nedelec<3>(0), 2);
const unsigned int dofs_per_cell = fe.dofs_per_cell;
std::vector< Point< 3 > > g_support_points =
fe.get_generalized_support_points();
unsigned int cell_counter = 1 ;
for (auto &cell : triangulation.active_cell_iterators()){
for (unsigned int i=0; i<dofs_per_cell; ++i) {
std::cout << " cell id: " << cell_counter <<"
generalized support point " << i << " " << g_support_points[i] << std::endl;
}
++ cell_counter;
}
}
// Output resut:
// Number of active cells : 1
// cell id: 1 support point 0 0 0.5 0
// cell id: 1 support point 1 1 0.5 0
// cell id: 1 support point 2 0.5 0 0
// cell id: 1 support point 3 0.5 1 0
// cell id: 1 support point 4 0 0.5 1
// cell id: 1 support point 5 1 0.5 1
// cell id: 1 support point 6 0.5 0 1
// cell id: 1 support point 7 0.5 1 1
// cell id: 1 support point 8 0 0 0.5
// cell id: 1 support point 9 1 0 0.5
// cell id: 1 support point 10 0 1 0.5
// cell id: 1 support point 11 1 1 0.5
// cell id: 1 support point 12 6.94991e-310 2.42092e-322 6.94992e-310
// cell id: 1 support point 13 4.64589e-310 4.64589e-310 4.64589e-310
// cell id: 1 support point 14 2.37152e-322 2.42092e-322 3.95253e-323
// cell id: 1 support point 15 4.64589e-310 0 -5.31401e+303
// cell id: 1 support point 16 4.94066e-324 2.42092e-322 6.94992e-310
// cell id: 1 support point 17 4.64589e-310 2.122e-314 0
// cell id: 1 support point 18 2.37152e-322 2.42092e-322 3.95253e-323
// cell id: 1 support point 19 4.64589e-310 0 -5.31401e+303
// cell id: 1 support point 20 1.4822e-323 9.53547e-322 4.64589e-310
// cell id: 1 support point 21 4.64589e-310 0 0
// cell id: 1 support point 22 0 4.64589e-310 4.64589e-310
// cell id: 1 support point 23 0 0 0
