--- /dev/null
+Improved: The functions VectorTools::point_values()/::point_gradients() and
+the class Utilities::MPI::RemotePointEvaluation now allow to specify the first
+component to be selected. The feature is used in the class DataOutResample
+to output multi-component solutions.
+<br>
+(Peter Munch, Magdalena Schreter, 2022/09/12)
* cache, dof_handler_2, vector_2);
* @endcode
*
+ * The function also works with FiniteElement objects with multiple
+ * components. If one is interested only in a range of components, one can
+ * select these by the parameters @p first_selected_component and
+ * @p n_components. For further details on supported FiniteElement
+ * objects, see the documentation of FEPointEvaluation.
+ *
* The function can also be used to evaluate cell-data vectors. For this
* purpose, one passes in a Triangulation instead of a DoFHandler and a
* vector of size Trinagulation::n_active_cells() or a vector, which
const VectorType & vector,
const std::vector<Point<spacedim>> & evaluation_points,
Utilities::MPI::RemotePointEvaluation<dim, spacedim> &cache,
- const EvaluationFlags::EvaluationFlags flags = EvaluationFlags::avg);
+ const EvaluationFlags::EvaluationFlags flags = EvaluationFlags::avg,
+ const unsigned int first_selected_component = 0);
/**
* Given a (distributed) solution vector @p vector, evaluate the values at
const Utilities::MPI::RemotePointEvaluation<dim, spacedim> &cache,
const MeshType<dim, spacedim> & mesh,
const VectorType & vector,
- const EvaluationFlags::EvaluationFlags flags = EvaluationFlags::avg);
+ const EvaluationFlags::EvaluationFlags flags = EvaluationFlags::avg,
+ const unsigned int first_selected_component = 0);
/**
* Given a (distributed) solution vector @p vector, evaluate the gradients at
const VectorType & vector,
const std::vector<Point<spacedim>> & evaluation_points,
Utilities::MPI::RemotePointEvaluation<dim, spacedim> &cache,
- const EvaluationFlags::EvaluationFlags flags = EvaluationFlags::avg);
+ const EvaluationFlags::EvaluationFlags flags = EvaluationFlags::avg,
+ const unsigned int first_selected_component = 0);
/**
* Given a (distributed) solution vector @p vector, evaluate the gradients at
const Utilities::MPI::RemotePointEvaluation<dim, spacedim> &cache,
const MeshType<dim, spacedim> & mesh,
const VectorType & vector,
- const EvaluationFlags::EvaluationFlags flags = EvaluationFlags::avg);
+ const EvaluationFlags::EvaluationFlags flags = EvaluationFlags::avg,
+ const unsigned int first_selected_component = 0);
const VectorType & vector,
const std::vector<Point<spacedim>> &evaluation_points,
Utilities::MPI::RemotePointEvaluation<dim, spacedim> &cache,
- const EvaluationFlags::EvaluationFlags flags)
+ const EvaluationFlags::EvaluationFlags flags,
+ const unsigned int first_selected_component)
{
cache.reinit(evaluation_points, mesh.get_triangulation(), mapping);
- return point_values<n_components>(cache, mesh, vector, flags);
+ return point_values<n_components>(
+ cache, mesh, vector, flags, first_selected_component);
}
const VectorType & vector,
const std::vector<Point<spacedim>> &evaluation_points,
Utilities::MPI::RemotePointEvaluation<dim, spacedim> &cache,
- const EvaluationFlags::EvaluationFlags flags)
+ const EvaluationFlags::EvaluationFlags flags,
+ const unsigned int first_selected_component)
{
cache.reinit(evaluation_points, mesh.get_triangulation(), mapping);
- return point_gradients<n_components>(cache, mesh, vector, flags);
+ return point_gradients<n_components>(
+ cache, mesh, vector, flags, first_selected_component);
}
const VectorType & vector,
const UpdateFlags update_flags,
const dealii::EvaluationFlags::EvaluationFlags evaluation_flags,
+ const unsigned int first_selected_component,
const std::function<
value_type(const FEPointEvaluation<n_components,
dim,
dim,
spacedim,
typename VectorType::value_type>>(
- cache.get_mapping(), cell->get_fe(), update_flags);
+ cache.get_mapping(),
+ cell->get_fe(),
+ update_flags,
+ first_selected_component);
auto &evaluator = *evaluators[cell->active_fe_index()];
evaluator.reinit(cell, unit_points);
const VectorType & vector,
const UpdateFlags,
const dealii::EvaluationFlags::EvaluationFlags evaluation_flags,
+ const unsigned int first_selected_component,
const std::function<
value_type(const FEPointEvaluation<n_components,
dim,
typename VectorType::value_type>>> &)
{
(void)evaluation_flags;
+ (void)first_selected_component;
- Assert(n_components == 1,
+ Assert(n_components == 1 && first_selected_component == 0,
ExcMessage(
"A cell-data vector can only have a single component."));
const MeshType & mesh,
const VectorType & vector,
const EvaluationFlags::EvaluationFlags flags,
- const UpdateFlags update_flags,
+ const unsigned int first_selected_component,
+ const UpdateFlags update_flags,
const dealii::EvaluationFlags::EvaluationFlags evaluation_flags,
const std::function<
value_type(const FEPointEvaluation<n_components,
vector,
update_flags,
evaluation_flags,
+ first_selected_component,
process_quadrature_point,
values,
solution_values,
const Utilities::MPI::RemotePointEvaluation<dim, spacedim> &cache,
const MeshType<dim, spacedim> & mesh,
const VectorType & vector,
- const EvaluationFlags::EvaluationFlags flags)
+ const EvaluationFlags::EvaluationFlags flags,
+ const unsigned int first_selected_component)
{
return internal::evaluate_at_points<
n_components,
mesh,
vector,
flags,
+ first_selected_component,
update_values,
dealii::EvaluationFlags::values,
[](const auto &evaluator, const auto &q) {
const Utilities::MPI::RemotePointEvaluation<dim, spacedim> &cache,
const MeshType<dim, spacedim> & mesh,
const VectorType & vector,
- const EvaluationFlags::EvaluationFlags flags)
+ const EvaluationFlags::EvaluationFlags flags,
+ const unsigned int first_selected_component)
{
return internal::evaluate_at_points<
n_components,
mesh,
vector,
flags,
+ first_selected_component,
update_gradients,
dealii::EvaluationFlags::gradients,
[](const auto &evaluator, const unsigned &q) {
const auto &dh = *data_ptr->dof_handler;
- // TODO: enable more components
- AssertDimension(dh.get_fe_collection().n_components(), 1);
-
- const auto values =
- VectorTools::point_values<1>(rpe, dh, data_ptr->vector);
-
- vectors.emplace_back(
- std::make_shared<LinearAlgebra::distributed::Vector<double>>(
- partitioner));
-
- for (unsigned int j = 0; j < values.size(); ++j)
- vectors.back()->local_element(point_to_local_vector_indices[j]) =
- values[j];
-
- vectors.back()->set_ghost_state(true);
-
- // we can give the vectors arbitrary names ("temp_*") here, since these
- // are only used internally (by patch_data_out) but not later on during
- // the actual output to file
- patch_data_out.add_data_vector(
- *vectors.back(),
- std::string("temp_" + std::to_string(counter)),
- DataOut_DoFData<patch_dim, patch_dim, spacedim, spacedim>::
- DataVectorType::type_dof_data);
-
- counter++;
+#ifdef DEBUG
+ for (const auto &fe : dh.get_fe_collection())
+ Assert(
+ fe.n_base_elements() == 1,
+ ExcMessage(
+ "This class currently only supports scalar elements and elements "
+ "with a single base element."));
+#endif
+
+ for (unsigned int comp = 0; comp < dh.get_fe_collection().n_components();
+ ++comp)
+ {
+ const auto values = VectorTools::point_values<1>(
+ rpe, dh, data_ptr->vector, VectorTools::EvaluationFlags::avg, comp);
+
+ vectors.emplace_back(
+ std::make_shared<LinearAlgebra::distributed::Vector<double>>(
+ partitioner));
+
+ for (unsigned int j = 0; j < values.size(); ++j)
+ vectors.back()->local_element(point_to_local_vector_indices[j]) =
+ values[j];
+
+ vectors.back()->set_ghost_state(true);
+
+ // we can give the vectors arbitrary names ("temp_*") here, since
+ // these are only used internally (by patch_data_out) but not later on
+ // during the actual output to file
+ patch_data_out.add_data_vector(
+ *vectors.back(),
+ std::string("temp_" + std::to_string(counter)),
+ DataOut_DoFData<patch_dim, patch_dim, spacedim, spacedim>::
+ DataVectorType::type_dof_data);
+
+ counter++;
+ }
}
patch_data_out.build_patches(*patch_mapping,
--- /dev/null
+// ---------------------------------------------------------------------
+//
+// Copyright (C) 2021 by the deal.II authors
+//
+// This file is part of the deal.II library.
+//
+// The deal.II library is free software; you can use it, redistribute
+// it, and/or modify it under the terms of the GNU Lesser General
+// Public License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+// The full text of the license can be found in the file LICENSE.md at
+// the top level directory of deal.II.
+//
+// ---------------------------------------------------------------------
+
+// Test DataOutResample to create a slice for FESystem with multiple
+// components.
+
+#include <deal.II/base/conditional_ostream.h>
+#include <deal.II/base/mpi_remote_point_evaluation.h>
+
+#include <deal.II/distributed/tria.h>
+
+#include <deal.II/dofs/dof_handler.h>
+#include <deal.II/dofs/dof_tools.h>
+
+#include <deal.II/fe/fe_q.h>
+#include <deal.II/fe/fe_system.h>
+#include <deal.II/fe/mapping_q1.h>
+
+#include <deal.II/grid/grid_generator.h>
+
+#include <deal.II/numerics/data_out_resample.h>
+#include <deal.II/numerics/vector_tools.h>
+
+#include "../tests.h"
+
+using namespace dealii;
+
+template <int dim>
+class AnalyticalFunction : public Function<dim>
+{
+public:
+ AnalyticalFunction(const unsigned n_components)
+ : Function<dim>(n_components)
+ {}
+
+ virtual double
+ value(const Point<dim> &p, const unsigned int component = 0) const
+ {
+ return p[component] * (component + 1.0) + component;
+ }
+};
+
+
+template <int dim, int spacedim>
+std::shared_ptr<const Utilities::MPI::Partitioner>
+create_partitioner(const DoFHandler<dim, spacedim> &dof_handler)
+{
+ IndexSet locally_relevant_dofs;
+
+ DoFTools::extract_locally_relevant_dofs(dof_handler, locally_relevant_dofs);
+
+ return std::make_shared<const Utilities::MPI::Partitioner>(
+ dof_handler.locally_owned_dofs(),
+ locally_relevant_dofs,
+ dof_handler.get_communicator());
+}
+
+
+
+int
+main(int argc, char **argv)
+{
+ Utilities::MPI::MPI_InitFinalize mpi(argc, argv, 1);
+ MPILogInitAll all;
+
+ const int dim = 3;
+ const int patch_dim = 2;
+ const int spacedim = 3;
+ const int n_components = dim;
+
+ const unsigned int n_refinements_1 = 3;
+ const unsigned int n_refinements_2 = 3;
+ const MPI_Comm comm = MPI_COMM_WORLD;
+
+ parallel::distributed::Triangulation<patch_dim, spacedim> tria_slice(comm);
+ GridGenerator::hyper_cube(tria_slice, -1.0, +1.0);
+ tria_slice.refine_global(n_refinements_2);
+
+ MappingQ1<patch_dim, spacedim> mapping_slice;
+
+ parallel::distributed::Triangulation<dim, spacedim> tria_backround(comm);
+ GridGenerator::hyper_cube(tria_backround, -1.0, +1.0);
+ tria_backround.refine_global(n_refinements_1);
+
+ DoFHandler<dim, spacedim> dof_handler(tria_backround);
+ dof_handler.distribute_dofs(
+ FESystem<dim, spacedim>(FE_Q<dim, spacedim>{1}, n_components));
+
+ MappingQ1<dim, spacedim> mapping;
+
+ LinearAlgebra::distributed::Vector<double> vector(
+ create_partitioner(dof_handler));
+
+ VectorTools::interpolate(mapping,
+ dof_handler,
+ AnalyticalFunction<dim>(n_components),
+ vector);
+
+ vector.update_ghost_values();
+
+ DataOutResample<dim, patch_dim, spacedim> data_out(tria_slice, mapping_slice);
+ data_out.add_data_vector(dof_handler, vector, "solution_0");
+ data_out.add_data_vector(dof_handler, vector, "solution_1");
+ data_out.update_mapping(mapping);
+ data_out.build_patches();
+
+#if 1
+ data_out.write_vtk(deallog.get_file_stream());
+#else
+ data_out.write_vtu_with_pvtu_record("./", "data_out_01", 0, comm, 1, 1);
+#endif
+}
--- /dev/null
+
+# vtk DataFile Version 3.0
+#This file was generated
+ASCII
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+