This class implements a step size control using Adams-Bashforth and Crank-Nicolson for solving ordinary partial equations. More...

#include <StepsizeControl.hpp>

Inheritance diagram for sgpp::solver::StepsizeControl:

Public Member Functions
void	solve (SLESolver &LinearSystemSolver, sgpp::solver::OperationParabolicPDESolverSystem &System, bool bIdentifyLastStep=false, bool verbose=false)
	Pure virtual Function that defines a solve method for an ODE solver. More...

	StepsizeControl (size_t imax, double timestepSize, double eps, double sc, sgpp::base::ScreenOutput *screen=NULL, double gamma=0.5)
	Std-Constructer. More...

virtual	~StepsizeControl ()
	Std-Destructor. More...

Public Member Functions inherited from sgpp::solver::ODESolver
	ODESolver (size_t imax, double timestepSize)
	Std-Constructor. More...

virtual	~ODESolver ()
	Std-Destructor. More...

Public Member Functions inherited from sgpp::solver::SGSolver
double	getEpsilon ()
	gets the the epsilon, that is used in the SGSolver More...

size_t	getNumberIterations ()
	function that returns the number of needed solve steps More...

double	getResiduum ()
	function the returns the residuum (current or final), error of the solver More...

void	setEpsilon (double eps)
	resets the epsilon, that is used in the SGSolver More...

void	setMaxIterations (size_t nIterations)
	resets the number of maximum iterations More...

	SGSolver (size_t nMaximumIterations, double epsilon)
	Std-Constructor. More...

virtual	~SGSolver ()
	Std-Destructor. More...

Protected Member Functions
virtual void	corrector (SLESolver &LinearSystemSolver, sgpp::solver::OperationParabolicPDESolverSystem &System, double tmp_timestepsize, sgpp::base::DataVector &dv, sgpp::base::DataVector *rhs)=0

double	maxNorm (sgpp::solver::OperationParabolicPDESolverSystem &System, sgpp::base::DataVector &dv1, sgpp::base::DataVector &dv2)

virtual double	nextTimestep (double tmp_timestepsize, double tmp_timestepsize_old, double norm, double epsilon)=0

virtual double	norm (sgpp::solver::OperationParabolicPDESolverSystem &System, sgpp::base::DataVector &dv1, sgpp::base::DataVector &dv2)

virtual void	predictor (SLESolver &LinearSystemSolver, sgpp::solver::OperationParabolicPDESolverSystem &System, double tmp_timestepsize, sgpp::base::DataVector &dv, sgpp::base::DataVector &corr, sgpp::base::DataVector *rhs)=0

double	twoNorm (sgpp::solver::OperationParabolicPDESolverSystem &System, sgpp::base::DataVector &dv1, sgpp::base::DataVector &dv2)

Protected Attributes
double	_gamma
	damping factor More...

std::string	filename

double	myEps
	epsilon for the step size control More...

double	mySC
	temp. Stepsize Control More...

sgpp::base::ScreenOutput *	myScreen
	Pointer to sgpp::base::ScreenOutput object. More...

Protected Attributes inherited from sgpp::solver::SGSolver
double	myEpsilon
	epsilon needed in the, e.g. final error in the iterative solver, or a timestep More...

size_t	nIterations
	Number of Iterations needed for the solve. More...

size_t	nMaxIterations
	Number of maximum iterations for cg. More...

double	residuum
	residuum More...

Detailed Description

This class implements a step size control using Adams-Bashforth and Crank-Nicolson for solving ordinary partial equations.

Constructor & Destructor Documentation

◆ StepsizeControl()

sgpp::solver::StepsizeControl::StepsizeControl	(	size_t	imax,
		double	timestepSize,
		double	eps,
		double	sc,
		sgpp::base::ScreenOutput *	screen = `NULL`,
		double	gamma = `0.5`
	)

Std-Constructer.

Parameters

sc	step size
imax	number of maximum executed iterations
timestepSize	the size of one timestep
eps	the epsilon for the step size control
screen	possible pointer to a sgpp::base::ScreenOutput object
gamma	damping factor

References friedman::eps, myEps, mySC, and sgpp::solver::SGSolver::residuum.

◆ ~StepsizeControl()

sgpp::solver::StepsizeControl::~StepsizeControl ( )

virtual

Std-Destructor.

Member Function Documentation

◆ corrector()

virtual void sgpp::solver::StepsizeControl::corrector	(	SLESolver &	LinearSystemSolver,
		sgpp::solver::OperationParabolicPDESolverSystem &	System,
		double	tmp_timestepsize,
		sgpp::base::DataVector &	dv,
		sgpp::base::DataVector *	rhs
	)

protectedpure virtual

Implemented in sgpp::solver::VarTimestep.

Referenced by solve().

◆ maxNorm()

double sgpp::solver::StepsizeControl::maxNorm	(	sgpp::solver::OperationParabolicPDESolverSystem &	System,
		sgpp::base::DataVector &	dv1,
		sgpp::base::DataVector &	dv2
	)

protected

References sgpp::base::HashGridStorage::begin(), sgpp::base::HashGridStorage::end(), sgpp::base::HashGridStorage::find(), sgpp::solver::OperationParabolicPDESolverSystem::getGridCoefficientsForCG(), sgpp::solver::OperationParabolicPDESolverSystem::getGridStorage(), sgpp::solver::OperationParabolicPDESolverSystem::getOldGridStorage(), sgpp::base::DataVector::getPointer(), sgpp::base::DataVector::getSize(), python.statsfileInfo::i, python.utils.statsfile2gnuplot::j, mySC, and friedman::p.

Referenced by sgpp::solver::StepsizeControlEJ::~StepsizeControlEJ().

◆ nextTimestep()

virtual double sgpp::solver::StepsizeControl::nextTimestep	(	double	tmp_timestepsize,
		double	tmp_timestepsize_old,
		double	norm,
		double	epsilon
	)

protectedpure virtual

Implemented in sgpp::solver::VarTimestep, sgpp::solver::StepsizeControlBDF, and sgpp::solver::StepsizeControlMC.

Referenced by solve().

◆ norm()

double sgpp::solver::StepsizeControl::norm	(	sgpp::solver::OperationParabolicPDESolverSystem &	System,
		sgpp::base::DataVector &	dv1,
		sgpp::base::DataVector &	dv2
	)

protectedvirtual

References twoNorm().

Referenced by sgpp::solver::StepsizeControlMC::nextTimestep(), solve(), and sgpp::solver::StepsizeControlH::~StepsizeControlH().

◆ predictor()

virtual void sgpp::solver::StepsizeControl::predictor	(	SLESolver &	LinearSystemSolver,
		sgpp::solver::OperationParabolicPDESolverSystem &	System,
		double	tmp_timestepsize,
		sgpp::base::DataVector &	dv,
		sgpp::base::DataVector &	corr,
		sgpp::base::DataVector *	rhs
	)

protectedpure virtual

Implemented in sgpp::solver::VarTimestep.

Referenced by solve().

◆ solve()

void sgpp::solver::StepsizeControl::solve	(	SLESolver &	LinearSystemSolver,
		sgpp::solver::OperationParabolicPDESolverSystem &	System,
		bool	bIdentifyLastStep = `false`,
		bool	verbose = `false`
	)

virtual

Pure virtual Function that defines a solve method for an ODE solver.

Parameters

LinearSystemSolver	reference to an instance of a linear system solver that is used by this ODE solver
System	reference to an sgpp::base::OperationMatrix Object that implements the matrix vector multiplication
bIdentifyLastStep	set this to true to tell System the last step
verbose	prints information during execution of the solver

Implements sgpp::solver::ODESolver.

References _gamma, sgpp::solver::OperationParabolicPDESolverSystem::abortTimestep(), sgpp::solver::OperationParabolicPDESolverSystem::coarsenAndRefine(), corrector(), filename, sgpp::solver::OperationParabolicPDESolverSystem::getGridCoefficients(), sgpp::solver::OperationParabolicPDESolverSystem::getGridCoefficientsForSC(), sgpp::solver::SGSolver::getNumberIterations(), sgpp::solver::SGSolver::getResiduum(), sgpp::base::DataVector::getSize(), python.statsfileInfo::i, myEps, sgpp::solver::SGSolver::myEpsilon, myScreen, nextTimestep(), sgpp::solver::SGSolver::nMaxIterations, norm(), predictor(), sgpp::solver::OperationParabolicPDESolverSystem::saveAlpha(), analyse_erg::tmp, sgpp::base::ScreenOutput::update(), and sgpp::base::ScreenOutput::writeEmptyLines().

◆ twoNorm()

double sgpp::solver::StepsizeControl::twoNorm	(	sgpp::solver::OperationParabolicPDESolverSystem &	System,
		sgpp::base::DataVector &	dv1,
		sgpp::base::DataVector &	dv2
	)

protected

References sgpp::base::DataVector::dotProduct(), and sgpp::base::DataVector::sub().

Referenced by norm().

Member Data Documentation

◆ _gamma

double sgpp::solver::StepsizeControl::_gamma

protected

damping factor

Referenced by solve().

◆ filename

std::string sgpp::solver::StepsizeControl::filename

protected

Referenced by solve(), sgpp::solver::StepsizeControlBDF::StepsizeControlBDF(), sgpp::solver::StepsizeControlEJ::StepsizeControlEJ(), sgpp::solver::StepsizeControlH::StepsizeControlH(), sgpp::solver::StepsizeControlMC::StepsizeControlMC(), and sgpp::solver::VarTimestep::VarTimestep().

◆ myEps

double sgpp::solver::StepsizeControl::myEps

protected

epsilon for the step size control

Referenced by solve(), StepsizeControl(), sgpp::solver::StepsizeControlBDF::StepsizeControlBDF(), sgpp::solver::StepsizeControlEJ::StepsizeControlEJ(), and sgpp::solver::StepsizeControlH::StepsizeControlH().

◆ mySC

double sgpp::solver::StepsizeControl::mySC

protected

temp. Stepsize Control

Referenced by maxNorm(), StepsizeControl(), and sgpp::solver::StepsizeControlEJ::StepsizeControlEJ().

◆ myScreen

sgpp::base::ScreenOutput* sgpp::solver::StepsizeControl::myScreen

protected

Pointer to sgpp::base::ScreenOutput object.

Referenced by solve().

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

solver/src/sgpp/solver/ode/StepsizeControl.hpp
solver/src/sgpp/solver/ode/StepsizeControl.cpp

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

◆ StepsizeControl()

◆ ~StepsizeControl()

Member Function Documentation

◆ corrector()

◆ maxNorm()

◆ nextTimestep()

◆ norm()

◆ predictor()

◆ solve()

◆ twoNorm()

Member Data Documentation

◆ _gamma

◆ filename

◆ myEps

◆ mySC

◆ myScreen