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Reference documentation for deal.II version Git 47f49d5886 2021-01-15 21:58:01 +0100
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#include <deal.II/lac/precondition.h>
Public Types | |
using | AdditionalData = typename PreconditionRelaxation< MatrixType >::AdditionalData |
using | size_type = typename MatrixType::size_type |
using | BaseClass = PreconditionRelaxation< MatrixType > |
Public Member Functions | |
void | initialize (const MatrixType &A, const typename BaseClass::AdditionalData ¶meters=typename BaseClass::AdditionalData()) |
template<class VectorType > | |
void | vmult (VectorType &, const VectorType &) const |
template<class VectorType > | |
void | Tvmult (VectorType &, const VectorType &) const |
template<class VectorType > | |
void | step (VectorType &x, const VectorType &rhs) const |
template<class VectorType > | |
void | Tstep (VectorType &x, const VectorType &rhs) const |
void | initialize (const MatrixType &A, const AdditionalData ¶meters=AdditionalData()) |
void | clear () |
size_type | m () const |
size_type | n () const |
template<class Archive > | |
void | serialize (Archive &ar, const unsigned int version) |
Subscriptor functionality | |
Classes derived from Subscriptor provide a facility to subscribe to this object. This is mostly used by the SmartPointer class. | |
void | subscribe (std::atomic< bool > *const validity, const std::string &identifier="") const |
void | unsubscribe (std::atomic< bool > *const validity, const std::string &identifier="") const |
unsigned int | n_subscriptions () const |
template<typename StreamType > | |
void | list_subscribers (StreamType &stream) const |
void | list_subscribers () const |
Static Public Member Functions | |
static ::ExceptionBase & | ExcInUse (int arg1, std::string arg2, std::string arg3) |
static ::ExceptionBase & | ExcNoSubscriber (std::string arg1, std::string arg2) |
Protected Attributes | |
SmartPointer< const MatrixType, PreconditionRelaxation< MatrixType > > | A |
double | relaxation |
Private Attributes | |
std::vector< std::size_t > | pos_right_of_diagonal |
SSOR preconditioner using matrix built-in function. The MatrixType
class used is required to have a function precondition_SSOR(VectorType&, const VectorType&, double)
. This class satisfies the relaxation concept.
Definition at line 650 of file precondition.h.
using PreconditionSSOR< MatrixType >::AdditionalData = typename PreconditionRelaxation<MatrixType>::AdditionalData |
An alias to the base class AdditionalData.
Definition at line 657 of file precondition.h.
using PreconditionSSOR< MatrixType >::size_type = typename MatrixType::size_type |
Declare type for container size.
Definition at line 662 of file precondition.h.
using PreconditionSSOR< MatrixType >::BaseClass = PreconditionRelaxation<MatrixType> |
An alias to the base class.
Definition at line 667 of file precondition.h.
void PreconditionSSOR< MatrixType >::initialize | ( | const MatrixType & | A, |
const typename BaseClass::AdditionalData & | parameters = typename BaseClass::AdditionalData() |
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) |
Initialize matrix and relaxation parameter. The matrix is just stored in the preconditioner object. The relaxation parameter should be larger than zero and smaller than 2 for numerical reasons. It defaults to 1.
void PreconditionSSOR< MatrixType >::vmult | ( | VectorType & | , |
const VectorType & | |||
) | const |
Apply preconditioner.
void PreconditionSSOR< MatrixType >::Tvmult | ( | VectorType & | , |
const VectorType & | |||
) | const |
Apply transpose preconditioner. Since this is a symmetric preconditioner, this function is the same as vmult().
void PreconditionSSOR< MatrixType >::step | ( | VectorType & | x, |
const VectorType & | rhs | ||
) | const |
Perform one step of the preconditioned Richardson iteration
void PreconditionSSOR< MatrixType >::Tstep | ( | VectorType & | x, |
const VectorType & | rhs | ||
) | const |
Perform one transposed step of the preconditioned Richardson iteration.
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inherited |
Initialize matrix and relaxation parameter. The matrix is just stored in the preconditioner object. The relaxation parameter should be larger than zero and smaller than 2 for numerical reasons. It defaults to 1.
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inherited |
Release the matrix and reset its pointer.
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inherited |
Return the dimension of the codomain (or range) space. Note that the matrix is of dimension \(m \times n\).
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inherited |
Return the dimension of the domain space. Note that the matrix is of dimension \(m \times n\).
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inherited |
Subscribes a user of the object by storing the pointer validity
. The subscriber may be identified by text supplied as identifier
.
Definition at line 136 of file subscriptor.cc.
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inherited |
Unsubscribes a user from the object.
identifier
and the validity
pointer must be the same as the one supplied to subscribe(). Definition at line 156 of file subscriptor.cc.
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inlineinherited |
Return the present number of subscriptions to this object. This allows to use this class for reference counted lifetime determination where the last one to unsubscribe also deletes the object.
Definition at line 301 of file subscriptor.h.
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inlineinherited |
List the subscribers to the input stream
.
Definition at line 318 of file subscriptor.h.
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inherited |
List the subscribers to deallog
.
Definition at line 204 of file subscriptor.cc.
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inlineinherited |
Read or write the data of this object to or from a stream for the purpose of serialization using the BOOST serialization library.
This function does not actually serialize any of the member variables of this class. The reason is that what this class stores is only who subscribes to this object, but who does so at the time of storing the contents of this object does not necessarily have anything to do with who subscribes to the object when it is restored. Consequently, we do not want to overwrite the subscribers at the time of restoring, and then there is no reason to write the subscribers out in the first place.
Definition at line 310 of file subscriptor.h.
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private |
An array that stores for each matrix row where the first position after the diagonal is located.
Definition at line 715 of file precondition.h.
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protectedinherited |
Pointer to the matrix object.
Definition at line 460 of file precondition.h.
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protectedinherited |
Relaxation parameter.
Definition at line 465 of file precondition.h.