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Reference documentation for deal.II version 9.6.0
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Reference documentation for deal.II version 9.6.0
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#include <deal.II/dofs/dof_accessor.h>
Public Types | |
| using | AccessorData = DoFHandler<dimension_, space_dimension_> |
| using | BaseClass |
| using | Container = DoFHandler<dimension_, space_dimension_> |
| using | face_iterator |
Public Member Functions | |
| TriaIterator< DoFCellAccessor< dimension_, space_dimension_, level_dof_access > > | parent () const |
| void | set_dof_indices (const std::vector< types::global_dof_index > &dof_indices) |
| void | set_mg_dof_indices (const std::vector< types::global_dof_index > &dof_indices) |
| const DoFHandler< dim, spacedim > & | get_dof_handler () const |
| void | copy_from (const DoFAccessor< structdim, dim, spacedim, level_dof_access2 > &a) |
| void | copy_from (const TriaAccessorBase< structdim, dim, spacedim > &da) |
| bool | operator== (const DoFAccessor< structdim2, dim2, spacedim2, level_dof_access2 > &) const |
| bool | operator!= (const DoFAccessor< structdim2, dim2, spacedim2, level_dof_access2 > &) const |
Constructors and initialization | |
| DoFCellAccessor (const Triangulation< dimension_, space_dimension_ > *tria, const int level, const int index, const AccessorData *local_data) | |
| template<int structdim2, int dim2, int spacedim2> | |
| DoFCellAccessor (const InvalidAccessor< structdim2, dim2, spacedim2 > &) | |
| template<int structdim2, int dim2, int spacedim2, bool level_dof_access2> | |
| DoFCellAccessor (const DoFAccessor< structdim2, dim2, spacedim2, level_dof_access2 > &) | |
| DoFCellAccessor (const DoFCellAccessor< dimension_, space_dimension_, level_dof_access > &)=default | |
| DoFCellAccessor (DoFCellAccessor< dimension_, space_dimension_, level_dof_access > &&)=default | |
| ~DoFCellAccessor ()=default | |
| DoFCellAccessor< dimension_, space_dimension_, level_dof_access > & | operator= (const DoFCellAccessor< dimension_, space_dimension_, level_dof_access > &da)=delete |
| DoFCellAccessor< dimension_, space_dimension_, level_dof_access > & | operator= (DoFCellAccessor< dimension_, space_dimension_, level_dof_access > &&)=default |
Accessing sub-objects and neighbors | |
| TriaIterator< DoFCellAccessor< dimension_, space_dimension_, level_dof_access > > | neighbor (const unsigned int i) const |
| TriaIterator< DoFCellAccessor< dimension_, space_dimension_, level_dof_access > > | periodic_neighbor (const unsigned int i) const |
| TriaIterator< DoFCellAccessor< dimension_, space_dimension_, level_dof_access > > | neighbor_or_periodic_neighbor (const unsigned int i) const |
| TriaIterator< DoFCellAccessor< dimension_, space_dimension_, level_dof_access > > | child (const unsigned int i) const |
| boost::container::small_vector< TriaIterator< DoFCellAccessor< dimension_, space_dimension_, level_dof_access > >, GeometryInfo< dimension_ >::max_children_per_cell > | child_iterators () const |
| face_iterator | face (const unsigned int i) const |
| boost::container::small_vector< face_iterator, GeometryInfo< dimension_ >::faces_per_cell > | face_iterators () const |
| TriaIterator< DoFCellAccessor< dimension_, space_dimension_, level_dof_access > > | neighbor_child_on_subface (const unsigned int face_no, const unsigned int subface_no) const |
| TriaIterator< DoFCellAccessor< dimension_, space_dimension_, level_dof_access > > | periodic_neighbor_child_on_subface (const unsigned int face_no, const unsigned int subface_no) const |
Extracting values from global vectors | |
| template<class InputVector , typename number > | |
| void | get_dof_values (const InputVector &values, Vector< number > &local_values) const |
| template<typename Number , typename ForwardIterator > | |
| void | get_dof_values (const ReadVector< Number > &values, ForwardIterator local_values_begin, ForwardIterator local_values_end) const |
| template<class InputVector , typename ForwardIterator > | |
| void | get_dof_values (const AffineConstraints< typename InputVector::value_type > &constraints, const InputVector &values, ForwardIterator local_values_begin, ForwardIterator local_values_end) const |
| template<class OutputVector , typename number > | |
| void | set_dof_values (const Vector< number > &local_values, OutputVector &values) const |
| template<typename Number > | |
| void | get_interpolated_dof_values (const ReadVector< Number > &values, Vector< Number > &interpolated_values, const types::fe_index fe_index=numbers::invalid_fe_index) const |
| template<class OutputVector , typename number > | |
| void | set_dof_values_by_interpolation (const Vector< number > &local_values, OutputVector &values, const types::fe_index fe_index=numbers::invalid_fe_index, const bool perform_check=false) const |
| template<class OutputVector , typename number > | |
| void | distribute_local_to_global_by_interpolation (const Vector< number > &local_values, OutputVector &values, const types::fe_index fe_index=numbers::invalid_fe_index) const |
| template<typename number , typename OutputVector > | |
| void | distribute_local_to_global (const Vector< number > &local_source, OutputVector &global_destination) const |
| template<typename ForwardIterator , typename OutputVector > | |
| void | distribute_local_to_global (ForwardIterator local_source_begin, ForwardIterator local_source_end, OutputVector &global_destination) const |
| template<typename ForwardIterator , typename OutputVector > | |
| void | distribute_local_to_global (const AffineConstraints< typename OutputVector::value_type > &constraints, ForwardIterator local_source_begin, ForwardIterator local_source_end, OutputVector &global_destination) const |
| template<typename number , typename OutputMatrix > | |
| void | distribute_local_to_global (const FullMatrix< number > &local_source, OutputMatrix &global_destination) const |
| template<typename number , typename OutputMatrix , typename OutputVector > | |
| void | distribute_local_to_global (const FullMatrix< number > &local_matrix, const Vector< number > &local_vector, OutputMatrix &global_matrix, OutputVector &global_vector) const |
Accessing the DoF indices of this object | |
| void | get_active_or_mg_dof_indices (std::vector< types::global_dof_index > &dof_indices) const |
| void | get_dof_indices (std::vector< types::global_dof_index > &dof_indices) const |
| void | get_mg_dof_indices (std::vector< types::global_dof_index > &dof_indices) const |
Accessing the finite element associated with this object | |
| const FiniteElement< dimension_, space_dimension_ > & | get_fe () const |
| types::fe_index | active_fe_index () const |
| void | set_active_fe_index (const types::fe_index i) const |
Dealing with refinement indicators | |
| const FiniteElement< dimension_, space_dimension_ > & | get_future_fe () const |
| types::fe_index | future_fe_index () const |
| void | set_future_fe_index (const types::fe_index i) const |
| bool | future_fe_index_set () const |
| void | clear_future_fe_index () const |
Accessing sub-objects | |
| typename::internal::DoFHandlerImplementation::Iterators< dim, spacedim, level_dof_access >::line_iterator | line (const unsigned int i) const |
| typename::internal::DoFHandlerImplementation::Iterators< dim, spacedim, level_dof_access >::quad_iterator | quad (const unsigned int i) const |
Accessing the DoF indices of this object | |
| void | get_dof_indices (std::vector< types::global_dof_index > &dof_indices, const types::fe_index fe_index=numbers::invalid_fe_index) const |
| void | get_mg_dof_indices (const int level, std::vector< types::global_dof_index > &dof_indices, const types::fe_index fe_index=numbers::invalid_fe_index) const |
| void | set_mg_dof_indices (const int level, const std::vector< types::global_dof_index > &dof_indices, const types::fe_index fe_index=numbers::invalid_fe_index) |
| types::global_dof_index | vertex_dof_index (const unsigned int vertex, const unsigned int i, const types::fe_index fe_index=numbers::invalid_fe_index) const |
| types::global_dof_index | mg_vertex_dof_index (const int level, const unsigned int vertex, const unsigned int i, const types::fe_index fe_index=numbers::invalid_fe_index) const |
| types::global_dof_index | dof_index (const unsigned int i, const types::fe_index fe_index=numbers::invalid_fe_index) const |
| types::global_dof_index | mg_dof_index (const int level, const unsigned int i) const |
Accessing the finite element associated with this object | |
| unsigned int | n_active_fe_indices () const |
| types::fe_index | nth_active_fe_index (const unsigned int n) const |
| std::set< types::fe_index > | get_active_fe_indices () const |
| bool | fe_index_is_active (const types::fe_index fe_index) const |
| const FiniteElement< dim, spacedim > & | get_fe (const types::fe_index fe_index) const |
Static Public Member Functions | |
| static bool | is_level_cell () |
| static ::ExceptionBase & | ExcInvalidObject () |
| static ::ExceptionBase & | ExcVectorNotEmpty () |
| static ::ExceptionBase & | ExcVectorDoesNotMatch () |
| static ::ExceptionBase & | ExcMatrixDoesNotMatch () |
| static ::ExceptionBase & | ExcNotActive () |
| static ::ExceptionBase & | ExcCantCompareIterators () |
Static Public Attributes | |
| static const unsigned int | dim = dimension_ |
| static const unsigned int | spacedim = space_dimension_ |
| static constexpr unsigned int | dimension |
| static constexpr unsigned int | space_dimension |
Protected Member Functions | |
| void | set_dof_handler (DoFHandler< dim, spacedim > *dh) |
| void | set_dof_index (const unsigned int i, const types::global_dof_index index, const types::fe_index fe_index=numbers::invalid_fe_index) const |
| void | set_mg_dof_index (const int level, const unsigned int i, const types::global_dof_index index) const |
| void | set_mg_vertex_dof_index (const int level, const unsigned int vertex, const unsigned int i, const types::global_dof_index index, const types::fe_index fe_index=numbers::invalid_fe_index) const |
Protected Attributes | |
| DoFHandler< dim, spacedim > * | dof_handler |
Friends | |
| struct | ::internal::DoFCellAccessorImplementation::Implementation |
Grant access to the degrees of freedom on a cell.
Note that since for the class we derive from, i.e. DoFAccessor<dim>, the two template parameters are equal, the base class is actually derived from CellAccessor, which makes the functions of this class available to the DoFCellAccessor class as well.
Definition at line 1322 of file dof_accessor.h.
| using DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::AccessorData = DoFHandler<dimension_, space_dimension_> |
Data type passed by the iterator class.
Definition at line 1342 of file dof_accessor.h.
| using DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::BaseClass |
Declare an alias to the base class to make accessing some of the exception classes simpler.
Definition at line 1348 of file dof_accessor.h.
| using DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::Container = DoFHandler<dimension_, space_dimension_> |
Define the type of the container this is part of.
Definition at line 1354 of file dof_accessor.h.
| using DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::face_iterator |
A type for an iterator over the faces of a cell. This is what the face() function returns.
Definition at line 1360 of file dof_accessor.h.
| DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::DoFCellAccessor | ( | const Triangulation< dimension_, space_dimension_ > * | tria, |
| const int | level, | ||
| const int | index, | ||
| const AccessorData * | local_data ) |
Constructor
| DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::DoFCellAccessor | ( | const InvalidAccessor< structdim2, dim2, spacedim2 > & | ) |
Conversion constructor. This constructor exists to make certain constructs simpler to write in dimension independent code. For example, it allows assigning a face iterator to a line iterator, an operation that is useful in 2d but doesn't make any sense in 3d. The constructor here exists for the purpose of making the code conform to C++ but it will unconditionally abort; in other words, assigning a face iterator to a line iterator is better put into an if-statement that checks that the dimension is two, and assign to a quad iterator in 3d (an operator that, without this constructor would be illegal if we happen to compile for 2d).
|
explicit |
Another conversion operator between objects that don't make sense, just like the previous one.
|
default |
Copy constructor.
|
default |
Move constructor.
|
default |
Destructor
|
delete |
Copy operator. These operators are usually used in a context like iterator a,b; *a=*b;. Presumably, the intent here is to copy the object pointed to by b to the object pointed to by a. However, the result of dereferencing an iterator is not an object but an accessor; consequently, this operation is not useful for iterators on DoF handler objects. Consequently, this operator is declared as deleted and can not be used.
|
default |
Move assignment operator.
| TriaIterator< DoFCellAccessor< dimension_, space_dimension_, level_dof_access > > DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::parent | ( | ) | const |
Return the parent of this cell as a DoF cell iterator. If the parent does not exist (i.e., if the object is at the coarsest level of the mesh hierarchy), an exception is generated.
This function is needed since the parent function of the base class CellAccessor returns a triangulation cell accessor without access to the DoF data.
| TriaIterator< DoFCellAccessor< dimension_, space_dimension_, level_dof_access > > DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::neighbor | ( | const unsigned int | i | ) | const |
Return the ith neighbor as a DoF cell iterator. This function is needed since the neighbor function of the base class returns a cell accessor without access to the DoF data.
|
inline |
Return the ith periodic neighbor as a DoF cell iterator. This function is needed since the neighbor function of the base class returns a cell accessor without access to the DoF data.
Definition at line 153 of file dof_accessor.cc.
|
inline |
Return the ith neighbor or periodic neighbor as a DoF cell iterator. This function is needed since the neighbor function of the base class returns a cell accessor without access to the DoF data.
Definition at line 166 of file dof_accessor.cc.
| TriaIterator< DoFCellAccessor< dimension_, space_dimension_, level_dof_access > > DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::child | ( | const unsigned int | i | ) | const |
Return the ith child as a DoF cell iterator. This function is needed since the child function of the base class returns a cell accessor without access to the DoF data.
| boost::container::small_vector< TriaIterator< DoFCellAccessor< dimension_, space_dimension_, level_dof_access > >, GeometryInfo< dimension_ >::max_children_per_cell > DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::child_iterators | ( | ) | const |
Return an array of iterators to all children of this cell.
| face_iterator DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::face | ( | const unsigned int | i | ) | const |
Return an iterator to the ith face of this cell.
This function returns a DoFAccessor with structdim == 0 in 1d, a DoFAccessor::line in 2d, and a DoFAccessor::quad in 3d.
| boost::container::small_vector< face_iterator, GeometryInfo< dimension_ >::faces_per_cell > DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::face_iterators | ( | ) | const |
Return an array of iterators to all faces of this cell.
| TriaIterator< DoFCellAccessor< dim, spacedim, lda > > DoFCellAccessor< dim, spacedim, lda >::neighbor_child_on_subface | ( | const unsigned int | face_no, |
| const unsigned int | subface_no ) const |
Return the result of the neighbor_child_on_subface function of the base class, but convert it so that one can also access the DoF data (the function in the base class only returns an iterator with access to the triangulation data).
Definition at line 124 of file dof_accessor.cc.
| TriaIterator< DoFCellAccessor< dim, spacedim, lda > > DoFCellAccessor< dim, spacedim, lda >::periodic_neighbor_child_on_subface | ( | const unsigned int | face_no, |
| const unsigned int | subface_no ) const |
Return the result of the periodic_neighbor_child_on_subface function of the base class, but convert it so that one can also access the DoF data (the function in the base class only returns an iterator with access to the triangulation data).
Definition at line 138 of file dof_accessor.cc.
| void DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::get_dof_values | ( | const InputVector & | values, |
| Vector< number > & | local_values ) const |
Collect the values of the given vector restricted to the dofs of this cell in the standard ordering: dofs on vertex 0, dofs on vertex 1, etc, dofs on line 0, dofs on line 1, etc, dofs on quad 0, etc. In other words, this function implements a gather operation.
The vector has to have the right size before being passed to this function. This function is only callable for active cells.
The input vector may be either a Vector<float>, Vector<double>, or a BlockVector<double>, or a PETSc or Trilinos vector if deal.II is compiled to support these libraries. It is in the responsibility of the caller to assure that the types of the numbers stored in input and output vectors are compatible and with similar accuracy.
| void DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::get_dof_values | ( | const ReadVector< Number > & | values, |
| ForwardIterator | local_values_begin, | ||
| ForwardIterator | local_values_end ) const |
Collect the values of the given vector restricted to the dofs of this cell in the standard ordering: dofs on vertex 0, dofs on vertex 1, etc, dofs on line 0, dofs on line 1, etc, dofs on quad 0, etc. In other words, this function implements a gather operation.
The vector has to have the right size before being passed to this function. This function is only callable for active cells.
The input vector may be either a Vector<float>, Vector<double>, or a BlockVector<double>, or a PETSc or Trilinos vector if deal.II is compiled to support these libraries. It is in the responsibility of the caller to assure that the types of the numbers stored in input and output vectors are compatible and with similar accuracy.
| void DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::get_dof_values | ( | const AffineConstraints< typename InputVector::value_type > & | constraints, |
| const InputVector & | values, | ||
| ForwardIterator | local_values_begin, | ||
| ForwardIterator | local_values_end ) const |
Collect the values of the given vector restricted to the dofs of this cell in the standard ordering: dofs on vertex 0, dofs on vertex 1, etc, dofs on line 0, dofs on line 1, etc, dofs on quad 0, etc. In other words, this function implements a gather operation.
The vector has to have the right size before being passed to this function. This function is only callable for active cells.
The input vector may be either a Vector<float>, Vector<double>, or a BlockVector<double>, or a PETSc or Trilinos vector if deal.II is compiled to support these libraries. It is in the responsibility of the caller to assure that the types of the numbers stored in input and output vectors are compatible and with similar accuracy. The AffineConstraints object passed as an argument to this function makes sure that constraints are correctly distributed when the dof values are calculated.
| void DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::set_dof_values | ( | const Vector< number > & | local_values, |
| OutputVector & | values ) const |
This function is the counterpart to get_dof_values(): it takes a vector of values for the degrees of freedom of the cell pointed to by this iterator and writes these values into the global data vector values. In other words, this function implements a scatter operation. This function is only callable for active cells.
Note that for continuous finite elements, calling this function affects the dof values on neighboring cells as well. It may also violate continuity requirements for hanging nodes, if neighboring cells are less refined than the present one. These requirements are not taken care of and must be enforced by the user afterwards.
The vector has to have the right size before being passed to this function.
The output vector may be either a Vector<float>, Vector<double>, or a BlockVector<double>, or a PETSc vector if deal.II is compiled to support these libraries. It is in the responsibility of the caller to assure that the types of the numbers stored in input and output vectors are compatible and with similar accuracy.
| void DoFCellAccessor< dim, spacedim, lda >::get_interpolated_dof_values | ( | const ReadVector< Number > & | values, |
| Vector< Number > & | interpolated_values, | ||
| const types::fe_index | fe_index = numbers::invalid_fe_index ) const |
Return the interpolation of the given finite element function to the present cell. In the simplest case, the cell is a terminal one, i.e., it has no children; then, the returned value is the vector of nodal values on that cell. You could as well get the desired values through the get_dof_values function. In the other case, when the cell has children, we use the restriction matrices provided by the finite element class to compute the interpolation from the children to the present cell.
If the cell is part of a DoFHandler with hp-capabilities, cells only have an associated finite element space if they are active. However, this function is supposed to also provide information on inactive cells with children. Consequently, it carries a third argument that can be used in the hp-context that denotes the finite element space we are supposed to interpolate onto. If the cell is active, this function then obtains the finite element function from the values vector on this cell and interpolates it onto the space described by the fe_indexth element of the hp::FECollection associated with the DoFHandler of which this cell is a part of. If the cell is not active, then we first perform this interpolation on all of its terminal children and then interpolate this function down to the cell requested keeping the function space the same.
It is assumed that both input vectors already have the right size beforehand.
Definition at line 44 of file dof_accessor_get.cc.
| void DoFCellAccessor< dim, spacedim, lda >::set_dof_values_by_interpolation | ( | const Vector< number > & | local_values, |
| OutputVector & | values, | ||
| const types::fe_index | fe_index = numbers::invalid_fe_index, | ||
| const bool | perform_check = false ) const |
This function is the counterpart to get_interpolated_dof_values(): you specify the dof values on a cell and these are interpolated to the children of the present cell and set on the terminal cells.
In principle, it works as follows: if the cell pointed to by this object is terminal (i.e., has no children), then the dof values are set in the global data vector by calling the set_dof_values() function; otherwise, the values are prolonged to each of the children and this function is called for each of them.
Using the get_interpolated_dof_values() and this function, you can compute the interpolation of a finite element function to a coarser grid by first getting the interpolated solution on a cell of the coarse grid and afterwards redistributing it using this function.
Note that for continuous finite elements, calling this function affects the dof values on neighboring cells as well. It may also violate continuity requirements for hanging nodes, if neighboring cells are less refined than the present one, or if their children are less refined than the children of this cell. These requirements are not taken care of and must be enforced by the user afterward.
If the cell is part of a DoFHandler with hp-capabilities, cells only have an associated finite element space if they are active. However, this function is supposed to also work on inactive cells with children. Consequently, it carries a third argument that can be used in the hp-context that denotes the finite element space we are supposed to interpret the input vector of this function in. If the cell is active, this function then interpolates the input vector interpreted as an element of the space described by the fe_indexth element of the hp::FECollection associated with the DoFHandler of which this cell is a part of, and interpolates it into the space that is associated with this cell. On the other hand, if the cell is not active, then we first perform this interpolation from this cell to its children using the given fe_index until we end up on an active cell, at which point we follow the procedure outlined at the beginning of the paragraph.
It is assumed that both vectors already have the right size beforehand. This function relies on the existence of a natural interpolation property of finite element spaces of a cell to its children, denoted by the prolongation matrices of finite element classes. For some elements, the spaces on coarse and fine grids are not nested, in which case the interpolation to a child is not the identity; refer to the documentation of the respective finite element class for a description of what the prolongation matrices represent in this case.
perform_check, you can enable a check that the previous value and the one to be set here are at least roughly the same. In practice, they might be slightly different because they are computed in a way that theoretically ensures that they are the same, but in practice they are only equal up to round-off.Definition at line 267 of file dof_accessor_set.cc.
| void DoFCellAccessor< dim, spacedim, lda >::distribute_local_to_global_by_interpolation | ( | const Vector< number > & | local_values, |
| OutputVector & | values, | ||
| const types::fe_index | fe_index = numbers::invalid_fe_index ) const |
Similar to set_dof_values_by_interpolation() with the difference that values are added into the vector.
Definition at line 289 of file dof_accessor_set.cc.
| void DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::distribute_local_to_global | ( | const Vector< number > & | local_source, |
| OutputVector & | global_destination ) const |
Distribute a local (cell based) vector to a global one by mapping the local numbering of the degrees of freedom to the global one and entering the local values into the global vector. In other words, this function implements a scatter operation.
The elements are added to the existing elements in the global vector, rather than just set, since this is usually what one wants. You may also want to take a look at the AffineConstraints::distribute_local_to_global() function if you need to deal with constraints.
| void DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::distribute_local_to_global | ( | ForwardIterator | local_source_begin, |
| ForwardIterator | local_source_end, | ||
| OutputVector & | global_destination ) const |
Distribute a local (cell based) vector in iterator format to a global one by mapping the local numbering of the degrees of freedom to the global one and entering the local values into the global vector. In other words, this function implements a scatter operation.
The elements are added to the existing elements in the global vector, rather than just set, since this is usually what one wants. You may also want to take a look at the AffineConstraints::distribute_local_to_global() function if you need to deal with constraints.
| void DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::distribute_local_to_global | ( | const AffineConstraints< typename OutputVector::value_type > & | constraints, |
| ForwardIterator | local_source_begin, | ||
| ForwardIterator | local_source_end, | ||
| OutputVector & | global_destination ) const |
Distribute a local (cell based) vector in iterator format to a global one by mapping the local numbering of the degrees of freedom to the global one and entering the local values into the global vector. In other words, this function implements a scatter operation.
The elements are added up to the elements in the global vector, rather than just set, since this is usually what one wants. Moreover, the AffineConstraints object passed to this function makes sure that also constraints are eliminated in this process.
| void DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::distribute_local_to_global | ( | const FullMatrix< number > & | local_source, |
| OutputMatrix & | global_destination ) const |
This function does much the same as the distribute_local_to_global(Vector,Vector) function, but operates on matrices instead of vectors. If the matrix type is a sparse matrix then it is supposed to have non-zero entry slots where required.
| void DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::distribute_local_to_global | ( | const FullMatrix< number > & | local_matrix, |
| const Vector< number > & | local_vector, | ||
| OutputMatrix & | global_matrix, | ||
| OutputVector & | global_vector ) const |
This function does what the two distribute_local_to_global functions with vector and matrix argument do, but all at once.
| void DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::get_active_or_mg_dof_indices | ( | std::vector< types::global_dof_index > & | dof_indices | ) | const |
Obtain the global indices of the local degrees of freedom on this cell.
If this object accesses a level cell (indicated by the third template argument or is_level_cell), then return the result of get_mg_dof_indices(), else return get_dof_indices().
You will get a level_cell_iterator when calling begin_mg() and a normal one otherwise.
Examples for this use are in the implementation of DoFRenumbering.
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inline |
Return the global indices of the degrees of freedom located on this object in the standard ordering defined by the finite element (i.e., dofs on vertex 0, dofs on vertex 1, etc, dofs on line 0, dofs on line 1, etc, dofs on quad 0, etc.) This function is only available on active objects (see this glossary entry).
| [out] | dof_indices | The vector into which the indices will be written. It has to have the right size (namely, fe.n_dofs_per_cell(), fe.dofs_per_face, or fe.dofs_per_line, depending on which kind of object this function is called) before being passed to this function. |
This function reimplements the same function in the base class. In contrast to the function in the base class, we do not need the fe_index here because there is always a unique finite element index on cells.
This is a function which requires that the cell is active.
Also see get_active_or_mg_dof_indices().
local_dof_indices by convention. The name is not meant to indicate the local numbers of degrees of freedom (which are always between zero and fe.n_dofs_per_cell()) but instead that the returned values are the global indices of those degrees of freedom that are located locally on the current cell. Definition at line 281 of file dof_accessor.cc.
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Retrieve the global indices of the degrees of freedom on this cell in the level vector associated to the level of the cell.
Definition at line 298 of file dof_accessor.cc.
| const FiniteElement< dimension_, space_dimension_ > & DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::get_fe | ( | ) | const |
Return the finite element that is used on the cell pointed to by this iterator. For DoFHandler objects without hp-capabilities, this is of course always the same element, independent of the cell we are presently on, but for hp-DoFHandler objects this may change from cell to cell.
| types::fe_index DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::active_fe_index | ( | ) | const |
Return the index inside the hp::FECollection of the FiniteElement used for this cell. This function is only useful if the DoFHandler object associated with the current cell has hp-capabilities enabled.
active_fe_index information is only exchanged from locally owned cells on one processor to other processors where they may be ghost cells, during the call to DoFHandler::set_fe() and DoFHandler::distribute_dofs(). Be aware that if you call set_active_fe_index() on a cell after calling one of these functions, then this information will not be propagated to other processors who may have this cell as a ghost cell. See the documentation of DoFHandler for more information. | void DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::set_active_fe_index | ( | const types::fe_index | i | ) | const |
Set the index of the FiniteElement used for this cell. This determines which element in an hp::FECollection to use. This function is only useful if the DoF handler object associated with the current cell has hp-capabilities enabled.
active_fe_index information is only exchanged from locally owned cells on one processor to other processors where they may be ghost cells, during the call to DoFHandler::set_fe() and DoFHandler::distribute_dofs(). Be aware that if you call set_active_fe_index() on a cell after calling one of these functions, then this information will not be propagated to other processors who may have this cell as a ghost cell. See the documentation of DoFHandler for more information. | void DoFCellAccessor< dim, spacedim, lda >::set_dof_indices | ( | const std::vector< types::global_dof_index > & | dof_indices | ) |
Set the DoF indices of this cell to the given values. This function bypasses the DoF cache, if one exists for the given DoF handler class.
Definition at line 105 of file dof_accessor.cc.
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Set the Level DoF indices of this cell to the given values.
Definition at line 312 of file dof_accessor.cc.
| const FiniteElement< dimension_, space_dimension_ > & DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::get_future_fe | ( | ) | const |
Return the finite element that will be assigned to this cell next time the triangulation gets refined and coarsened. If no future finite element has been specified for this cell via the set_future_fe_index() function, the active one will remain unchanged, in which case the active finite element will be returned.
For DoFHandlers without hp-capabilities enabled, this is of course always the same element, independent of the cell we are presently on, but for hp-DoFHandler objects this may change from cell to cell.
| types::fe_index DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::future_fe_index | ( | ) | const |
Return the fe_index of the finite element that will be assigned to this cell next time the triangulation gets refined and coarsened. If no future finite element has been specified for this cell via the set_future_fe_index() function, the active one will remain unchanged, in which case the fe_index of the active finite element will be returned.
| void DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::set_future_fe_index | ( | const types::fe_index | i | ) | const |
Set the fe_index of the finite element that will be assigned to this cell next time the triangulation gets refined and coarsened. A previously assigned future finite element will be overwritten.
See notes of future_fe_index() for information about restrictions on this functionality.
| bool DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::future_fe_index_set | ( | ) | const |
Return whether a future finite element has been set.
See notes of future_fe_index() for information about restrictions on this functionality.
| void DoFCellAccessor< dimension_, space_dimension_, level_dof_access >::clear_future_fe_index | ( | ) | const |
Revoke the future finite element assigned. Thus, the active finite element will remain unchanged next time the triangulation gets refined and coarsened.
See notes on future_fe_index() for information about restrictions on this functionality.
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Return a handle on the DoFHandler object which we are using.
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Implement the copy operator needed for the iterator classes.
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Copy operator used by the iterator class. Keeps the previously set dof handler, but sets the object coordinates of the TriaAccessor.
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Tell the caller whether get_active_or_mg_dof_indices() accesses active or level dofs.
Definition at line 367 of file dof_accessor.h.
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Pointer to the ith line bounding this object. If the current object is a line itself, then the only valid index is i equals to zero, and the function returns an iterator to itself.
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Pointer to the ith quad bounding this object. If the current object is a quad itself, then the only valid index is i equals to zero, and the function returns an iterator to itself.
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inlineinherited |
Return the global indices of the degrees of freedom located on this object in the standard ordering defined by the finite element (i.e., dofs on vertex 0, dofs on vertex 1, etc, dofs on line 0, dofs on line 1, etc, dofs on quad 0, etc.) This function is only available on active objects (see this glossary entry).
The cells needs to be an active cell (and not artificial in a parallel distributed computation).
The vector has to have the right size before being passed to this function.
The last argument denotes the finite element index. For the standard DoFHandler class, this value must be equal to its default value since that class only supports the same finite element on all cells anyway.
However, when the relevant DoFHandler object has hp-capabilities enabled, different finite element objects may be used on different cells. On faces between two cells, as well as vertices, there may therefore be two sets of degrees of freedom, one for each of the finite elements used on the adjacent cells. In order to specify which set of degrees of freedom to work on, the last argument is used to disambiguate. Finally, if this function is called for a cell object, there can only be a single set of degrees of freedom, and fe_index has to match the result of active_fe_index().
For cells, there is only a single possible finite element index (namely the one for that cell, returned by cell->active_fe_index. Consequently, the derived DoFCellAccessor class has an overloaded version of this function that calls the present function with cell->active_fe_index as last argument.
Definition at line 446 of file dof_accessor.cc.
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Return the global multilevel indices of the degrees of freedom that live on the current object with respect to the given level within the multigrid hierarchy. The indices refer to the local numbering for the level this line lives on.
Definition at line 457 of file dof_accessor.cc.
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Set the level DoF indices that are returned by get_mg_dof_indices.
Definition at line 466 of file dof_accessor.cc.
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Global DoF index of the i degree associated with the vertexth vertex of the present cell.
The last argument denotes the finite element index. For the standard DoFHandler class, this value must be equal to its default value since that class only supports the same finite element on all cells anyway.
However, when hp-capabilities are enabled, different finite element objects may be used on different cells. On faces between two cells, as well as vertices, there may therefore be two sets of degrees of freedom, one for each of the finite elements used on the adjacent cells. In order to specify which set of degrees of freedom to work on, the last argument is used to disambiguate. Finally, if this function is called for a cell object, there can only be a single set of degrees of freedom, and fe_index has to match the result of cell->active_fe_index(). Alternatively, if fe_index is left to its default value when this function is called on a cell, then this is interpreted as equal to cell->active_fe_index().
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Return the global DoF index of the ith degree of freedom associated with the vertexth vertex on level level. Also see vertex_dof_index().
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inherited |
Index of the ith degree of freedom of this object.
The last argument denotes the finite element index. For the standard DoFHandler class, this value must be equal to its default value since that class only supports the same finite element on all cells anyway.
However, when hp-capabilities are enabled, different finite element objects may be used on different cells. On faces between two cells, as well as vertices, there may therefore be two sets of degrees of freedom, one for each of the finite elements used on the adjacent cells. In order to specify which set of degrees of freedom to work on, the last argument is used to disambiguate. Finally, if this function is called for a cell object, there can only be a single set of degrees of freedom, and fe_index has to match the result of active_fe_index().
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Return the dof_index on the given level. Also see dof_index.
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inherited |
Return the number of finite elements that are active on a given object.
When hp-capabilities are disabled the answer is, of course, always one. However, when hp-capabilities are enabled, this isn't the case: If this is a cell, the answer is of course one. If it is a face, the answer may be one or two, depending on whether the two adjacent cells use the same finite element or not. If it is an edge in 3d, the possible return value may be one or any other value larger than that.
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Return the n-th active FE index on this object. For cells and all non-hp-objects, there is only a single active FE index, so the argument must be equal to zero. For lower-dimensional hp-objects, there are n_active_fe_indices() active finite elements, and this function can be queried for their indices.
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inherited |
Returns all active FE indices on this object.
The size of the returned set equals the number of finite elements that are active on this object.
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inherited |
Return true if the finite element with given index is active on the present object. When the current DoFHandler does not have hp-capabilities, this is of course the case only if fe_index equals zero. For cells, it is the case if fe_index equals active_fe_index() of this cell. For faces and other lower- dimensional objects, there may be more than one fe_index that are active on any given object (see n_active_fe_indices()).
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Return a reference to the finite element used on this object with the given fe_index. fe_index must be used on this object, i.e. fe_index_is_active(fe_index) must return true.
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staticinherited |
Exceptions for child classes
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staticinherited |
Exception
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staticinherited |
Exception
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staticinherited |
Exception
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A function has been called for a cell which should be active, but is refined.
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Exception
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inherited |
Compare for equality. Return true if the two accessors refer to the same object.
The template parameters of this function allow for a comparison of very different objects. Therefore, some of them are disabled. Namely, if the dimension, or the dof handler of the two objects differ, an exception is generated. It can be expected that this is an unwanted comparison.
The template parameter level_dof_access2 is ignored, such that an iterator with level access can be equal to one with access to the active degrees of freedom.
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inherited |
Compare for inequality. The boolean not of operator==().
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protectedinherited |
Reset the DoF handler pointer.
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protectedinherited |
Set the index of the ith degree of freedom of this object to index.
The last argument denotes the finite element index. For the standard DoFHandler class, this value must be equal to its default value since that class only supports the same finite element on all cells anyway.
However, when the relevant DoFHandler has hp-capabilities, different finite element objects may be used on different cells. On faces between two cells, as well as vertices, there may therefore be two sets of degrees of freedom, one for each of the finite elements used on the adjacent cells. In order to specify which set of degrees of freedom to work on, the last argument is used to disambiguate. Finally, if this function is called for a cell object, there can only be a single set of degrees of freedom, and fe_index has to match the result of active_fe_index().
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Definition at line 2114 of file dof_accessor.h.
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Extract dimension from DoFHandler.
Definition at line 1331 of file dof_accessor.h.
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Extract space dimension from DoFHandler.
Definition at line 1336 of file dof_accessor.h.
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staticconstexprinherited |
A static variable that allows users of this class to discover the value of the second template argument.
Definition at line 218 of file dof_accessor.h.
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staticconstexprinherited |
A static variable that allows users of this class to discover the value of the third template argument.
Definition at line 224 of file dof_accessor.h.
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Store the address of the DoFHandler object to be accessed.
Definition at line 659 of file dof_accessor.h.
1.11.0