Reference documentation for deal.II version Git 7a0e96d111 2021-06-21 21:20:26 -0400
MGTransferBlockBase Class Reference

#include <deal.II/multigrid/mg_transfer_block.h>

Inheritance diagram for MGTransferBlockBase:
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## Public Member Functions

MGTransferBlockBase ()

MGTransferBlockBase (const MGConstrainedDoFs &mg_constrained_dofs)

std::size_t memory_consumption () const

## Protected Member Functions

template<int dim, int spacedim>
void build (const DoFHandler< dim, spacedim > &dof_handler)

## Static Protected Member Functions

static ::ExceptionBaseExcMatricesNotBuilt ()

## Protected Attributes

std::vector< boolselected

unsigned int n_mg_blocks

std::vector< unsigned intmg_block

std::vector< std::vector< types::global_dof_index > > sizes

std::vector< types::global_dof_indexblock_start

std::vector< std::vector< types::global_dof_index > > mg_block_start

std::vector< std::shared_ptr< BlockSparseMatrix< double > > > prolongation_matrices

std::vector< std::vector< std::vector< std::pair< unsigned int, unsigned int > > > > copy_indices

SmartPointer< const MGConstrainedDoFs, MGTransferBlockBasemg_constrained_dofs

## Private Attributes

std::vector< std::shared_ptr< BlockSparsityPattern > > prolongation_sparsities

## Detailed Description

Implementation of matrix generation for MGTransferBlock.

This is the base class for MGTransfer objects for systems of equations where multigrid is applied only to one or some blocks, where a GlossBlock comprises all degrees of freedom generated by one base element.

Definition at line 60 of file mg_transfer_block.h.

## ◆ MGTransferBlockBase() [1/2]

 MGTransferBlockBase::MGTransferBlockBase ( )

Constructor without constraint matrices. Use this constructor only with discontinuous finite elements or with no local refinement.

Definition at line 39 of file multigrid.cc.

## ◆ MGTransferBlockBase() [2/2]

 MGTransferBlockBase::MGTransferBlockBase ( const MGConstrainedDoFs & mg_constrained_dofs )

Constructor with constraint matrices as well as mg_constrained_dofs.

Definition at line 45 of file multigrid.cc.

## ◆ memory_consumption()

 std::size_t MGTransferBlockBase::memory_consumption ( ) const

Memory used by this object.

Definition at line 174 of file multigrid.cc.

## ◆ build()

template<int dim, int spacedim>
 void MGTransferBlockBase::build ( const DoFHandler< dim, spacedim > & dof_handler )
protected

Actually build the prolongation matrices for each level.

This function is only called by derived classes. These can also set the member variables selected and others to restrict the transfer matrices to certain blocks.

Definition at line 207 of file mg_transfer_block.cc.

## ◆ selected

 std::vector MGTransferBlockBase::selected
protected

Flag of selected blocks.

The transfer operators only act on the blocks having a true entry here.

Definition at line 100 of file mg_transfer_block.h.

## ◆ n_mg_blocks

 unsigned int MGTransferBlockBase::n_mg_blocks
protected

Number of blocks of multigrid vector.

Definition at line 105 of file mg_transfer_block.h.

## ◆ mg_block

 std::vector MGTransferBlockBase::mg_block
protected

For each block of the whole block vector, list to what block of the multigrid vector it is mapped. Since depending on selected, there may be fewer multilevel blocks than original blocks, some of the entries may be illegal unsigned integers.

Definition at line 115 of file mg_transfer_block.h.

## ◆ sizes

 std::vector > MGTransferBlockBase::sizes
mutableprotected

Sizes of the multi-level vectors.

Definition at line 120 of file mg_transfer_block.h.

## ◆ block_start

 std::vector MGTransferBlockBase::block_start
protected

Start index of each block.

Definition at line 125 of file mg_transfer_block.h.

## ◆ mg_block_start

 std::vector > MGTransferBlockBase::mg_block_start
protected

Start index of each block on all levels.

Definition at line 130 of file mg_transfer_block.h.

## ◆ prolongation_sparsities

 std::vector > MGTransferBlockBase::prolongation_sparsities
private

Definition at line 138 of file mg_transfer_block.h.

## ◆ prolongation_matrices

 std::vector > > MGTransferBlockBase::prolongation_matrices
protected

The actual prolongation matrix. column indices belong to the dof indices of the mother cell, i.e. the coarse level. while row indices belong to the child cell, i.e. the fine level.

Definition at line 146 of file mg_transfer_block.h.

## ◆ copy_indices

 std::vector > > > MGTransferBlockBase::copy_indices
protected

Mapping for the copy_to/from_mg-functions. The indices into this vector are (in this order): global block number, level number. The data is first the global index inside the block, then the level index inside the block.

Definition at line 155 of file mg_transfer_block.h.

## ◆ mg_constrained_dofs

 SmartPointer MGTransferBlockBase::mg_constrained_dofs
protected

The mg_constrained_dofs of the level systems.

Definition at line 162 of file mg_transfer_block.h.

The documentation for this class was generated from the following files: