sgpp::base::DirichletGridConverter Class Reference

This class handles the conversion of a boundary grid with dirichlet boundary conditions into an inner. More...

#include <DirichletGridConverter.hpp>

Public Member Functions
void	buildInnerGridWithCoefs (Grid &BoundaryGrid, DataVector &BoundaryCoefs, Grid **InnerGrid, DataVector **InnerCoefs)
	builds a sparse grid without any boundaries from a sparse grid with boundaries. More...
void	calcInnerCoefs (DataVector &BoundaryCoefs, DataVector &InnerCoefs)
	copies the boundary grid's inner coefficients to the inner grid coefficients More...
	DirichletGridConverter ()
	Constructor. More...
void	rebuildInnerGridWithCoefs (Grid &BoundaryGrid, DataVector &BoundaryCoefs, Grid **InnerGrid, DataVector **InnerCoefs)
	rebuilds a sparse grid without any boundaries from a sparse grid with boundaries. More...
void	updateBoundaryCoefs (DataVector &BoundaryCoefs, DataVector &InnerCoefs)
	copies the inner grid's coefficients to the identical (inner) ansatzfunctions in the boundary grid. More...
	~DirichletGridConverter ()
	Destructor. More...

Detailed Description

This class handles the conversion of a boundary grid with dirichlet boundary conditions into an inner.

This is useful in case of solving a linear system of the grid's ansatzfunctions' coefficients: Here the boundary points are needed during solving the system (they constant because dirichlet boundary conditions), so a lot of work can be saved if only the inner points are used.

Constructor & Destructor Documentation

DirichletGridConverter()

sgpp::base::DirichletGridConverter::DirichletGridConverter

(

)

Constructor.

~DirichletGridConverter()

sgpp::base::DirichletGridConverter::~DirichletGridConverter

(

)

Destructor.

Member Function Documentation

buildInnerGridWithCoefs()

void sgpp::base::DirichletGridConverter::buildInnerGridWithCoefs	(	Grid &	BoundaryGrid,
		DataVector &	BoundaryCoefs,
		Grid **	InnerGrid,
		DataVector **	InnerCoefs
	)

builds a sparse grid without any boundaries from a sparse grid with boundaries.

In addition the coefficient vector is also created and initialized for the inner grid.

Parameters

BoundaryGrid	the boundary grid whose inner should be extracted
BoundaryCoefs	the boundary's grid coefficients
InnerGrid	Pointer to the inner grid, initialized in this method
InnerCoefs	Pointer to the inner grid's coefficients, initialized in this mehtod

References sgpp::base::DataVector::get(), sgpp::base::Grid::getAlgorithmicDimensions(), sgpp::base::Grid::getBoundingBox(), sgpp::base::HashGridStorage::getNumberOfInnerPoints(), sgpp::base::HashGridStorage::getSize(), sgpp::base::Grid::getStorage(), sgpp::base::Grid::getStretching(), sgpp::base::Grid::getType(), python.statsfileInfo::i, sgpp::base::HashGridPoint::isInnerPoint(), sgpp::base::LinearBoundary, sgpp::base::LinearL0Boundary, sgpp::base::LinearStretchedBoundary, and sgpp::base::Grid::setAlgorithmicDimensions().

calcInnerCoefs()

void sgpp::base::DirichletGridConverter::calcInnerCoefs	(	DataVector &	BoundaryCoefs,
		DataVector &	InnerCoefs
	)

copies the boundary grid's inner coefficients to the inner grid coefficients

Here a very check, due to performance issues, is implemented to sync both vectors by checking the size of both vectors. It must match to the creation size determined in buildInnerGridWithCoefs.

Parameters

BoundaryCoefs	the boundary grid's coefficients
InnerCoefs	the inner grid's coefficients

References sgpp::base::DataVector::get(), python.statsfileInfo::i, and sgpp::base::DataVector::set().

Referenced by sgpp::pde::HeatEquationParabolicPDESolverSystemParallelOMP::generateRHS(), sgpp::pde::OperationEllipticPDESolverSystemDirichlet::generateRHS(), sgpp::pde::OperationParabolicPDESolverSystemDirichlet::generateRHS(), and sgpp::pde::OperationParabolicPDESolverSystemDirichlet::getGridCoefficientsForCG().

rebuildInnerGridWithCoefs()

void sgpp::base::DirichletGridConverter::rebuildInnerGridWithCoefs	(	Grid &	BoundaryGrid,
		DataVector &	BoundaryCoefs,
		Grid **	InnerGrid,
		DataVector **	InnerCoefs
	)

rebuilds a sparse grid without any boundaries from a sparse grid with boundaries.

In addition the coefficient vector is also created and initialized for the inner grid.

Parameters

BoundaryGrid	the boundary grid whose inner should be extracted
BoundaryCoefs	the boundary's grid coefficients
InnerGrid	Pointer to the inner grid, initialized in this method
InnerCoefs	Pointer to the inner grid's coefficients, initialized in this mehtod

References sgpp::base::DataVector::get(), sgpp::base::Grid::getAlgorithmicDimensions(), sgpp::base::HashGridStorage::getNumberOfInnerPoints(), sgpp::base::HashGridStorage::getSize(), sgpp::base::Grid::getStorage(), sgpp::base::Grid::getType(), python.statsfileInfo::i, sgpp::base::HashGridPoint::isInnerPoint(), sgpp::base::LinearBoundary, sgpp::base::LinearL0Boundary, and sgpp::base::LinearStretchedBoundary.

updateBoundaryCoefs()

void sgpp::base::DirichletGridConverter::updateBoundaryCoefs	(	DataVector &	BoundaryCoefs,
		DataVector &	InnerCoefs
	)

copies the inner grid's coefficients to the identical (inner) ansatzfunctions in the boundary grid.

Here a very check, due to performance issues, is implemented to sync both vectors by checking the size of both vectors. It must match to the creation size determined in buildInnerGridWithCoefs.

Parameters

BoundaryCoefs	the boundary grid's coefficients
InnerCoefs	the inner grid's coefficients

References sgpp::base::DataVector::get(), python.statsfileInfo::i, and sgpp::base::DataVector::set().

Referenced by sgpp::pde::HeatEquationParabolicPDESolverSystem::finishTimestep(), sgpp::pde::HeatEquationParabolicPDESolverSystemParallelOMP::finishTimestep(), and sgpp::pde::OperationEllipticPDESolverSystemDirichlet::getSolutionBoundGrid().

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

• base/src/sgpp/base/grid/common/DirichletGridConverter.hpp
• base/src/sgpp/base/grid/common/DirichletGridConverter.cpp