Reference documentation for deal.II version 9.0.0
Public Member Functions | Private Attributes | List of all members
PreconditionMG< dim, VectorType, TRANSFER > Class Template Reference
Multilevel support

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

Inheritance diagram for PreconditionMG< dim, VectorType, TRANSFER >:
[legend]

Public Member Functions

 PreconditionMG (const DoFHandler< dim > &dof_handler, Multigrid< VectorType > &mg, const TRANSFER &transfer)
 
 PreconditionMG (const std::vector< const DoFHandler< dim > *> &dof_handler, Multigrid< VectorType > &mg, const TRANSFER &transfer)
 
bool empty () const
 
template<class OtherVectorType >
void vmult (OtherVectorType &dst, const OtherVectorType &src) const
 
template<class OtherVectorType >
void vmult_add (OtherVectorType &dst, const OtherVectorType &src) const
 
template<class OtherVectorType >
void Tvmult (OtherVectorType &dst, const OtherVectorType &src) const
 
template<class OtherVectorType >
void Tvmult_add (OtherVectorType &dst, const OtherVectorType &src) const
 
IndexSet locally_owned_range_indices (const unsigned int block=0) const
 
IndexSet locally_owned_domain_indices (const unsigned int block=0) const
 
MPI_Comm get_mpi_communicator () const
 
boost::signals2::connection connect_transfer_to_mg (const std::function< void(bool)> &slot)
 
boost::signals2::connection connect_transfer_to_global (const std::function< void(bool)> &slot)
 
- Public Member Functions inherited from Subscriptor
 Subscriptor ()
 
 Subscriptor (const Subscriptor &)
 
 Subscriptor (Subscriptor &&) noexcept
 
virtual ~Subscriptor ()
 
Subscriptor & operator= (const Subscriptor &)
 
Subscriptor & operator= (Subscriptor &&) noexcept
 
void subscribe (const char *identifier=nullptr) const
 
void unsubscribe (const char *identifier=nullptr) const
 
unsigned int n_subscriptions () const
 
void list_subscribers () const
 
template<class Archive >
void serialize (Archive &ar, const unsigned int version)
 

Private Attributes

std::vector< SmartPointer< const DoFHandler< dim >, PreconditionMG< dim, VectorType, TRANSFER > > > dof_handler_vector
 
std::vector< const DoFHandler< dim > * > dof_handler_vector_raw
 
SmartPointer< Multigrid< VectorType >, PreconditionMG< dim, VectorType, TRANSFER > > multigrid
 
SmartPointer< const TRANSFER, PreconditionMG< dim, VectorType, TRANSFER > > transfer
 
const bool uses_dof_handler_vector
 
mg::Signals signals
 

Additional Inherited Members

- Static Public Member Functions inherited from Subscriptor
static ::ExceptionBase & ExcInUse (int arg1, std::string arg2, std::string arg3)
 
static ::ExceptionBase & ExcNoSubscriber (std::string arg1, std::string arg2)
 

Detailed Description

template<int dim, typename VectorType, class TRANSFER>
class PreconditionMG< dim, VectorType, TRANSFER >

Multi-level preconditioner. Here, we collect all information needed for multi-level preconditioning and provide the standard interface for LAC iterative methods.

Furthermore, it needs functions void copy_to_mg(const VectorType&) to store src in the right hand side of the multi-level method and void copy_from_mg(VectorType&) to store the result of the v-cycle in dst.

If VectorType is in fact a block vector and the TRANSFER object supports use of a separate DoFHandler for each block, this class also allows to be initialized with a separate DoFHandler for each block.

Author
Guido Kanschat, Daniel Arndt, 1999, 2000, 2001, 2002, 2017

Definition at line 466 of file multigrid.h.

Constructor & Destructor Documentation

◆ PreconditionMG() [1/2]

template<int dim, typename VectorType, class TRANSFER>
PreconditionMG< dim, VectorType, TRANSFER >::PreconditionMG ( const DoFHandler< dim > &  dof_handler,
Multigrid< VectorType > &  mg,
const TRANSFER &  transfer 
)

Constructor. Arguments are the multigrid object, pre-smoother, post- smoother and coarse grid solver.

◆ PreconditionMG() [2/2]

template<int dim, typename VectorType, class TRANSFER>
PreconditionMG< dim, VectorType, TRANSFER >::PreconditionMG ( const std::vector< const DoFHandler< dim > *> &  dof_handler,
Multigrid< VectorType > &  mg,
const TRANSFER &  transfer 
)

Same as above in case every component of a block vector uses its own DoFHandler.

Member Function Documentation

◆ empty()

template<int dim, typename VectorType, class TRANSFER>
bool PreconditionMG< dim, VectorType, TRANSFER >::empty ( ) const

Dummy function needed by other classes.

◆ vmult()

template<int dim, typename VectorType, class TRANSFER>
template<class OtherVectorType >
void PreconditionMG< dim, VectorType, TRANSFER >::vmult ( OtherVectorType &  dst,
const OtherVectorType &  src 
) const

Preconditioning operator. Calls the vcycle function of the MG object passed to the constructor.

This is the operator used by LAC iterative solvers.

◆ vmult_add()

template<int dim, typename VectorType, class TRANSFER>
template<class OtherVectorType >
void PreconditionMG< dim, VectorType, TRANSFER >::vmult_add ( OtherVectorType &  dst,
const OtherVectorType &  src 
) const

Preconditioning operator. Calls the vcycle function of the MG object passed to the constructor.

◆ Tvmult()

template<int dim, typename VectorType, class TRANSFER>
template<class OtherVectorType >
void PreconditionMG< dim, VectorType, TRANSFER >::Tvmult ( OtherVectorType &  dst,
const OtherVectorType &  src 
) const

Transposed preconditioning operator.

Not implemented, but the definition may be needed.

◆ Tvmult_add()

template<int dim, typename VectorType, class TRANSFER>
template<class OtherVectorType >
void PreconditionMG< dim, VectorType, TRANSFER >::Tvmult_add ( OtherVectorType &  dst,
const OtherVectorType &  src 
) const

Transposed preconditioning operator.

Not implemented, but the definition may be needed.

◆ locally_owned_range_indices()

template<int dim, typename VectorType, class TRANSFER>
IndexSet PreconditionMG< dim, VectorType, TRANSFER >::locally_owned_range_indices ( const unsigned int  block = 0) const

Return the partitioning of the range space of this preconditioner, i.e., the partitioning of the vectors that are result from matrix-vector products. By default, the respective information for the first DoFHandler object are returned.

◆ locally_owned_domain_indices()

template<int dim, typename VectorType, class TRANSFER>
IndexSet PreconditionMG< dim, VectorType, TRANSFER >::locally_owned_domain_indices ( const unsigned int  block = 0) const

Return the partitioning of the domain space of this preconditioner, i.e., the partitioning of the vectors this matrix has to be multiplied with. By default, the respective information for the first DoFHandler object are returned.

◆ get_mpi_communicator()

template<int dim, typename VectorType, class TRANSFER>
MPI_Comm PreconditionMG< dim, VectorType, TRANSFER >::get_mpi_communicator ( ) const

Return the MPI communicator object in use with this preconditioner.

◆ connect_transfer_to_mg()

template<int dim, typename VectorType, class TRANSFER>
boost::signals2::connection PreconditionMG< dim, VectorType, TRANSFER >::connect_transfer_to_mg ( const std::function< void(bool)> &  slot)

Connect a function to mg::Signals::transfer_to_mg.

◆ connect_transfer_to_global()

template<int dim, typename VectorType, class TRANSFER>
boost::signals2::connection PreconditionMG< dim, VectorType, TRANSFER >::connect_transfer_to_global ( const std::function< void(bool)> &  slot)

Connect a function to mg::Signals::transfer_to_global.

Member Data Documentation

◆ dof_handler_vector

template<int dim, typename VectorType, class TRANSFER>
std::vector<SmartPointer<const DoFHandler<dim>,PreconditionMG<dim,VectorType,TRANSFER> > > PreconditionMG< dim, VectorType, TRANSFER >::dof_handler_vector
private

Associated DoFHandler.

Definition at line 563 of file multigrid.h.

◆ dof_handler_vector_raw

template<int dim, typename VectorType, class TRANSFER>
std::vector<const DoFHandler<dim>*> PreconditionMG< dim, VectorType, TRANSFER >::dof_handler_vector_raw
private

Storage for the pointers to the DoFHandler objects without SmartPointer wrapper.

Definition at line 569 of file multigrid.h.

◆ multigrid

template<int dim, typename VectorType, class TRANSFER>
SmartPointer<Multigrid<VectorType>,PreconditionMG<dim,VectorType,TRANSFER> > PreconditionMG< dim, VectorType, TRANSFER >::multigrid
private

The multigrid object.

Definition at line 574 of file multigrid.h.

◆ transfer

template<int dim, typename VectorType, class TRANSFER>
SmartPointer<const TRANSFER,PreconditionMG<dim,VectorType,TRANSFER> > PreconditionMG< dim, VectorType, TRANSFER >::transfer
private

Object for grid transfer.

Definition at line 579 of file multigrid.h.

◆ uses_dof_handler_vector

template<int dim, typename VectorType, class TRANSFER>
const bool PreconditionMG< dim, VectorType, TRANSFER >::uses_dof_handler_vector
private

Flag to indicate if the object is initialized with a single DoFHandler or with one for each block.

Definition at line 585 of file multigrid.h.

◆ signals

template<int dim, typename VectorType, class TRANSFER>
mg::Signals PreconditionMG< dim, VectorType, TRANSFER >::signals
private

Signals used by this object

Definition at line 590 of file multigrid.h.

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