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

Inheritance diagram for SolverRichardson< VectorType >:

Classes
struct	AdditionalData

Public Member Functions
	SolverRichardson (SolverControl &cn, VectorMemory< VectorType > &mem, const AdditionalData &data=AdditionalData())

	SolverRichardson (SolverControl &cn, const AdditionalData &data=AdditionalData())

virtual	~SolverRichardson () override=default

template<typename MatrixType , typename PreconditionerType >
void	solve (const MatrixType &A, VectorType &x, const VectorType &b, const PreconditionerType &preconditioner)

template<typename MatrixType , typename PreconditionerType >
void	Tsolve (const MatrixType &A, VectorType &x, const VectorType &b, const PreconditionerType &preconditioner)

void	set_omega (const double om=1.)

virtual void	print_vectors (const unsigned int step, const VectorType &x, const VectorType &r, const VectorType &d) const

Public Member Functions inherited from SolverBase< VectorType >
	SolverBase (SolverControl &solver_control, VectorMemory< VectorType > &vector_memory)

	SolverBase (SolverControl &solver_control)

boost::signals2::connection	connect (const std::function< SolverControl::State(const unsigned int iteration, const double check_value, const VectorType &current_iterate)> &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 (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

template<class Archive >
void	serialize (Archive &ar, const unsigned int version)

Protected Member Functions
virtual VectorType::value_type	criterion (const VectorType &r, const VectorType &d) const

Protected Attributes
AdditionalData	additional_data

Protected Attributes inherited from SolverBase< VectorType >
GrowingVectorMemory< VectorType >	static_vector_memory

VectorMemory< VectorType > &	memory

boost::signals2::signal< SolverControl::State(const unsigned int iteration, const double check_value, const VectorType &current_iterate), StateCombiner >	iteration_status

Additional Inherited Members
Public Types inherited from SolverBase< VectorType >
using	vector_type = VectorType

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<class VectorType = Vector<double>>
class SolverRichardson< VectorType >

Implementation of the preconditioned Richardson iteration method. The stopping criterion is the norm of the residual.

For the requirements on matrices and vectors in order to work with this class, see the documentation of the Solver base class.

Like all other solver classes, this class has a local structure called AdditionalData which is used to pass additional parameters to the solver, like damping parameters or the number of temporary vectors. We use this additional structure instead of passing these values directly to the constructor because this makes the use of the SolverSelector and other classes much easier and guarantees that these will continue to work even if number or type of the additional parameters for a certain solver changes.

For the Richardson method, the additional data is the damping parameter, which is the only content of the AdditionalData structure. By default, the constructor of the structure sets it to one.

Observing the progress of linear solver iterations

The solve() function of this class uses the mechanism described in the Solver base class to determine convergence. This mechanism can also be used to observe the progress of the iteration.

Author: Ralf Hartmann

Definition at line 63 of file solver_richardson.h.