Reference documentation for deal.II version Git e46400c 2016-08-29 20:53:26 -0600
Public Types | Public Member Functions | Static Public Member Functions | Protected Attributes | Private Attributes | List of all members
PreconditionSelector< MatrixType, VectorType > Class Template Reference

#include <deal.II/lac/precondition_selector.h>

Inheritance diagram for PreconditionSelector< MatrixType, VectorType >:
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Public Types

typedef MatrixType::size_type size_type
 

Public Member Functions

 PreconditionSelector (const std::string &preconditioning, const typename VectorType::value_type &omega=1.)
 
virtual ~PreconditionSelector ()
 
void use_matrix (const MatrixType &M)
 
size_type m () const
 
size_type n () const
 
virtual void vmult (VectorType &dst, const VectorType &src) const
 
virtual void Tvmult (VectorType &dst, const VectorType &src) const
 
- Public Member Functions inherited from Subscriptor
 Subscriptor ()
 
 Subscriptor (const Subscriptor &)
 
 Subscriptor (Subscriptor &&)
 
virtual ~Subscriptor ()
 
Subscriptoroperator= (const Subscriptor &)
 
Subscriptoroperator= (Subscriptor &&)
 
void subscribe (const char *identifier=0) const
 
void unsubscribe (const char *identifier=0) const
 
unsigned int n_subscriptions () const
 
void list_subscribers () const
 
template<class Archive >
void serialize (Archive &ar, const unsigned int version)
 

Static Public Member Functions

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

Protected Attributes

std::string preconditioning
 

Private Attributes

SmartPointer< const MatrixType, PreconditionSelector< MatrixType, VectorType > > A
 
const VectorType::value_type omega
 

Detailed Description

template<typename MatrixType = SparseMatrix<double>, typename VectorType = ::Vector<double>>
class PreconditionSelector< MatrixType, VectorType >

Selects the preconditioner. The constructor of this class takes the name of the preconditioning and the damping parameter omega of the preconditioning and the use_matrix function takes the matrix that is used by the matrix-builtin precondition functions. Each time, the operator() function is called, this preselected preconditioner, this matrix and this omega is used for the preconditioning. This class is designed for being used as argument of the solve function of a Solver and it covers the selection of all matrix-builtin precondition functions. The selection of other preconditioners, like BlockSOR or ILU should be handled in derived classes by the user.

Usage

The simplest use of this class is the following:

// generate a @p SolverControl and
// a @p VectorMemory
SolverControl control;
// generate a solver
SolverCG<SparseMatrix<double>, Vector<double> > solver(control, memory);
// generate a @p PreconditionSelector
preconditioning("jacobi", 1.);
// give a matrix whose diagonal entries
// are to be used for the preconditioning.
// Generally the matrix of the linear
// equation system Ax=b.
preconditioning.use_matrix(A);
// call the @p solve function with this
// preconditioning as last argument
solver.solve(A,x,b,preconditioning);

The same example where also the SolverSelector class is used reads

// generate a @p SolverControl and
// a @p VectorMemory
SolverControl control;
// generate a @p SolverSelector that
// calls the @p SolverCG
solver_selector("cg", control, memory);
// generate a @p PreconditionSelector
preconditioning("jacobi", 1.);
preconditioning.use_matrix(A);
solver_selector.solve(A,x,b,preconditioning);

Now the use of the SolverSelector in combination with the PreconditionSelector allows the user to select both, the solver and the preconditioner, at the beginning of his program and each time the solver is started (that is several times e.g. in a nonlinear iteration) this preselected solver and preconditioner is called.

Author
Ralf Hartmann, 1999; extension for full compatibility with LinearOperator class: Jean-Paul Pelteret, 2015

Definition at line 95 of file precondition_selector.h.

Member Typedef Documentation

template<typename MatrixType = SparseMatrix<double>, typename VectorType = ::Vector<double>>
typedef MatrixType::size_type PreconditionSelector< MatrixType, VectorType >::size_type

Declare type for container size.

Definition at line 101 of file precondition_selector.h.

Constructor & Destructor Documentation

template<typename MatrixType , typename VectorType >
PreconditionSelector< MatrixType, VectorType >::PreconditionSelector ( const std::string &  preconditioning,
const typename VectorType::value_type &  omega = 1. 
)

Constructor. omega denotes the damping parameter of the preconditioning.

Definition at line 188 of file precondition_selector.h.

template<typename MatrixType , typename VectorType >
PreconditionSelector< MatrixType, VectorType >::~PreconditionSelector ( )
virtual

Destructor.

Definition at line 195 of file precondition_selector.h.

Member Function Documentation

template<typename MatrixType , typename VectorType >
void PreconditionSelector< MatrixType, VectorType >::use_matrix ( const MatrixType &  M)

Takes the matrix that is needed for preconditionings that involves a matrix. e.g. for precondition_jacobi, ~_sor, ~_ssor.

Definition at line 203 of file precondition_selector.h.

template<typename MatrixType , typename VectorType >
PreconditionSelector< MatrixType, VectorType >::size_type PreconditionSelector< MatrixType, VectorType >::m ( ) const
inline

Return the dimension of the codomain (or range) space. To remember: the matrix is of dimension \(m \times n\).

Definition at line 211 of file precondition_selector.h.

template<typename MatrixType , typename VectorType >
PreconditionSelector< MatrixType, VectorType >::size_type PreconditionSelector< MatrixType, VectorType >::n ( ) const
inline

Return the dimension of the domain space. To remember: the matrix is of dimension \(m \times n\).

Definition at line 220 of file precondition_selector.h.

template<typename MatrixType , typename VectorType >
void PreconditionSelector< MatrixType, VectorType >::vmult ( VectorType &  dst,
const VectorType &  src 
) const
virtual

Precondition procedure. Calls the preconditioning that was specified in the constructor.

Definition at line 229 of file precondition_selector.h.

template<typename MatrixType , typename VectorType >
void PreconditionSelector< MatrixType, VectorType >::Tvmult ( VectorType &  dst,
const VectorType &  src 
) const
virtual

Transpose precondition procedure. Calls the preconditioning that was specified in the constructor.

Definition at line 259 of file precondition_selector.h.

template<typename MatrixType , typename VectorType >
std::string PreconditionSelector< MatrixType, VectorType >::get_precondition_names ( )
static

Get the names of all implemented preconditionings.

Definition at line 289 of file precondition_selector.h.

Member Data Documentation

template<typename MatrixType = SparseMatrix<double>, typename VectorType = ::Vector<double>>
std::string PreconditionSelector< MatrixType, VectorType >::preconditioning
protected

Stores the name of the preconditioning.

Definition at line 167 of file precondition_selector.h.

template<typename MatrixType = SparseMatrix<double>, typename VectorType = ::Vector<double>>
SmartPointer<const MatrixType,PreconditionSelector<MatrixType,VectorType> > PreconditionSelector< MatrixType, VectorType >::A
private

Matrix that is used for the matrix-builtin preconditioning function. cf. also PreconditionUseMatrix.

Definition at line 174 of file precondition_selector.h.

template<typename MatrixType = SparseMatrix<double>, typename VectorType = ::Vector<double>>
const VectorType::value_type PreconditionSelector< MatrixType, VectorType >::omega
private

Stores the damping parameter of the preconditioner.

Definition at line 179 of file precondition_selector.h.


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