#include <multigrid.hpp>

Inheritance diagram for mfem::Multigrid:

Collaboration diagram for mfem::Multigrid:

Public Types
enum	CycleType { CycleType::VCYCLE, CycleType::WCYCLE }

Public Types inherited from mfem::Operator
enum	DiagonalPolicy { DIAG_ZERO, DIAG_ONE, DIAG_KEEP }
	Defines operator diagonal policy upon elimination of rows and/or columns. More...

enum	Type { ANY_TYPE, MFEM_SPARSEMAT, Hypre_ParCSR, PETSC_MATAIJ, PETSC_MATIS, PETSC_MATSHELL, PETSC_MATNEST, PETSC_MATHYPRE, PETSC_MATGENERIC, Complex_Operator, MFEM_ComplexSparseMat, Complex_Hypre_ParCSR }
	Enumeration defining IDs for some classes derived from Operator. More...

Public Member Functions
	Multigrid (const FiniteElementSpaceHierarchy &fespaces_)
	Constructs an empty multigrid for the given FiniteElementSpaceHierarchy. More...

virtual	~Multigrid ()
	Destructor. More...

void	AddLevel (Operator opr, Solver smoother, bool ownOperator, bool ownSmoother)
	Adds a level to the multigrid operator hierarchy. More...

int	NumLevels () const
	Returns the number of levels. More...

int	GetFinestLevelIndex () const
	Returns the index of the finest level. More...

const Operator *	GetOperatorAtLevel (int level) const
	Returns operator at given level. More...

Operator *	GetOperatorAtLevel (int level)
	Returns operator at given level. More...

const Operator *	GetOperatorAtFinestLevel () const
	Returns operator at finest level. More...

Operator *	GetOperatorAtFinestLevel ()
	Returns operator at finest level. More...

Solver *	GetSmootherAtLevel (int level) const
	Returns smoother at given level. More...

Solver *	GetSmootherAtLevel (int level)
	Returns smoother at given level. More...

void	SetCycleType (CycleType cycleType_, int preSmoothingSteps_, int postSmoothingSteps_)
	Set the cycle type and number of pre- and post-smoothing steps used by Mult. More...

virtual void	Mult (const Vector &x, Vector &y) const override
	Application of the multigrid as a preconditioner. More...

virtual void	SetOperator (const Operator &op) override
	Not supported for multigrid. More...

void	FormFineLinearSystem (Vector &x, Vector &b, OperatorHandle &A, Vector &X, Vector &B)
	Form the linear system A X = B, corresponding to the operator on the finest level. More...

void	RecoverFineFEMSolution (const Vector &X, const Vector &b, Vector &x)
	Recover the solution of a linear system formed with FormFineLinearSystem() More...

Public Member Functions inherited from mfem::Solver
	Solver (int s=0, bool iter_mode=false)
	Initialize a square Solver with size s. More...

	Solver (int h, int w, bool iter_mode=false)
	Initialize a Solver with height h and width w. More...

Public Member Functions inherited from mfem::Operator
void	InitTVectors (const Operator Po, const Operator Ri, const Operator *Pi, Vector &x, Vector &b, Vector &X, Vector &B) const
	Initializes memory for true vectors of linear system. More...

	Operator (int s=0)
	Construct a square Operator with given size s (default 0). More...

	Operator (int h, int w)
	Construct an Operator with the given height (output size) and width (input size). More...

int	Height () const
	Get the height (size of output) of the Operator. Synonym with NumRows(). More...

int	NumRows () const
	Get the number of rows (size of output) of the Operator. Synonym with Height(). More...

int	Width () const
	Get the width (size of input) of the Operator. Synonym with NumCols(). More...

int	NumCols () const
	Get the number of columns (size of input) of the Operator. Synonym with Width(). More...

virtual MemoryClass	GetMemoryClass () const
	Return the MemoryClass preferred by the Operator. More...

virtual void	MultTranspose (const Vector &x, Vector &y) const
	Action of the transpose operator: `y=A^t(x)`. The default behavior in class Operator is to generate an error. More...

virtual Operator &	GetGradient (const Vector &x) const
	Evaluate the gradient operator at the point x. The default behavior in class Operator is to generate an error. More...

virtual const Operator *	GetProlongation () const
	Prolongation operator from linear algebra (linear system) vectors, to input vectors for the operator. `NULL` means identity. More...

virtual const Operator *	GetRestriction () const
	Restriction operator from input vectors for the operator to linear algebra (linear system) vectors. `NULL` means identity. More...

virtual const Operator *	GetOutputProlongation () const
	Prolongation operator from linear algebra (linear system) vectors, to output vectors for the operator. `NULL` means identity. More...

virtual const Operator *	GetOutputRestriction () const
	Restriction operator from output vectors for the operator to linear algebra (linear system) vectors. `NULL` means identity. More...

void	FormLinearSystem (const Array< int > &ess_tdof_list, Vector &x, Vector &b, Operator *&A, Vector &X, Vector &B, int copy_interior=0)
	Form a constrained linear system using a matrix-free approach. More...

void	FormRectangularLinearSystem (const Array< int > &trial_tdof_list, const Array< int > &test_tdof_list, Vector &x, Vector &b, Operator *&A, Vector &X, Vector &B)
	Form a column-constrained linear system using a matrix-free approach. More...

virtual void	RecoverFEMSolution (const Vector &X, const Vector &b, Vector &x)
	Reconstruct a solution vector x (e.g. a GridFunction) from the solution X of a constrained linear system obtained from Operator::FormLinearSystem() or Operator::FormRectangularLinearSystem(). More...

void	FormSystemOperator (const Array< int > &ess_tdof_list, Operator *&A)
	Return in A a parallel (on truedofs) version of this square operator. More...

void	FormRectangularSystemOperator (const Array< int > &trial_tdof_list, const Array< int > &test_tdof_list, Operator *&A)
	Return in A a parallel (on truedofs) version of this rectangular operator (including constraints). More...

void	FormDiscreteOperator (Operator *&A)
	Return in A a parallel (on truedofs) version of this rectangular operator. More...

void	PrintMatlab (std::ostream &out, int n=0, int m=0) const
	Prints operator with input size n and output size m in Matlab format. More...

virtual	~Operator ()
	Virtual destructor. More...

Type	GetType () const
	Return the type ID of the Operator class. More...

Protected Attributes
const FiniteElementSpaceHierarchy &	fespaces

Array< Array< int > * >	essentialTrueDofs

Array< BilinearForm * >	bfs

Protected Attributes inherited from mfem::Operator
int	height
	Dimension of the output / number of rows in the matrix. More...

int	width
	Dimension of the input / number of columns in the matrix. More...

Additional Inherited Members
Public Attributes inherited from mfem::Solver
bool	iterative_mode
	If true, use the second argument of Mult() as an initial guess. More...

Protected Member Functions inherited from mfem::Operator
void	FormConstrainedSystemOperator (const Array< int > &ess_tdof_list, ConstrainedOperator *&Aout)
	see FormSystemOperator() More...

void	FormRectangularConstrainedSystemOperator (const Array< int > &trial_tdof_list, const Array< int > &test_tdof_list, RectangularConstrainedOperator *&Aout)
	see FormRectangularSystemOperator() More...

Operator *	SetupRAP (const Operator Pi, const Operator Po)
	Returns RAP Operator of this, taking in input/output Prolongation matrices. More...

Detailed Description

Multigrid solver class.

Definition at line 25 of file multigrid.hpp.

Member Enumeration Documentation

enum mfem::Multigrid::CycleType

strong

Enumerator
VCYCLE
WCYCLE

Definition at line 28 of file multigrid.hpp.

Constructor & Destructor Documentation

mfem::Multigrid::Multigrid ( const FiniteElementSpaceHierarchy & fespaces_ )

Constructs an empty multigrid for the given FiniteElementSpaceHierarchy.

Definition at line 17 of file multigrid.cpp.

mfem::Multigrid::~Multigrid ( )

virtual

Destructor.

Definition at line 22 of file multigrid.cpp.

Member Function Documentation

void mfem::Multigrid::AddLevel	(	Operator *	opr,
		Solver *	smoother,
		bool	ownOperator,
		bool	ownSmoother
	)

Adds a level to the multigrid operator hierarchy.

The ownership of the operators and solvers/smoothers may be transferred to the Multigrid by setting the according boolean variables.

Definition at line 62 of file multigrid.cpp.

void mfem::Multigrid::FormFineLinearSystem	(	Vector &	x,
		Vector &	b,
		OperatorHandle &	A,
		Vector &	X,
		Vector &	B
	)

Form the linear system A X = B, corresponding to the operator on the finest level.

Definition at line 201 of file multigrid.cpp.

int mfem::Multigrid::GetFinestLevelIndex ( ) const

Returns the index of the finest level.

Definition at line 84 of file multigrid.cpp.

const Operator * mfem::Multigrid::GetOperatorAtFinestLevel ( ) const

Returns operator at finest level.

Definition at line 96 of file multigrid.cpp.

Operator * mfem::Multigrid::GetOperatorAtFinestLevel ( )

Returns operator at finest level.

Definition at line 101 of file multigrid.cpp.

const Operator * mfem::Multigrid::GetOperatorAtLevel ( int level ) const

Returns operator at given level.

Definition at line 86 of file multigrid.cpp.

Operator * mfem::Multigrid::GetOperatorAtLevel ( int level )

Returns operator at given level.

Definition at line 91 of file multigrid.cpp.

Solver * mfem::Multigrid::GetSmootherAtLevel ( int level ) const

Returns smoother at given level.

Definition at line 106 of file multigrid.cpp.

Solver * mfem::Multigrid::GetSmootherAtLevel ( int level )

Returns smoother at given level.

Definition at line 111 of file multigrid.cpp.

void mfem::Multigrid::Mult	(	const Vector &	x,
		Vector &	y
	)		const

overridevirtual

Application of the multigrid as a preconditioner.

Implements mfem::Operator.

Definition at line 124 of file multigrid.cpp.

int mfem::Multigrid::NumLevels ( ) const

Returns the number of levels.

Definition at line 82 of file multigrid.cpp.

void mfem::Multigrid::RecoverFineFEMSolution	(	const Vector &	X,
		const Vector &	b,
		Vector &	x
	)

Recover the solution of a linear system formed with FormFineLinearSystem()

Definition at line 207 of file multigrid.cpp.

void mfem::Multigrid::SetCycleType	(	CycleType	cycleType_,
		int	preSmoothingSteps_,
		int	postSmoothingSteps_
	)

Set the cycle type and number of pre- and post-smoothing steps used by Mult.

Definition at line 116 of file multigrid.cpp.

void mfem::Multigrid::SetOperator ( const Operator & op )

overridevirtual

Not supported for multigrid.

Implements mfem::Solver.

Definition at line 133 of file multigrid.cpp.

Member Data Documentation

Array<BilinearForm*> mfem::Multigrid::bfs

protected

Definition at line 37 of file multigrid.hpp.

Array<Array<int>*> mfem::Multigrid::essentialTrueDofs

protected

Definition at line 36 of file multigrid.hpp.

const FiniteElementSpaceHierarchy& mfem::Multigrid::fespaces

protected

Definition at line 35 of file multigrid.hpp.

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

fem/multigrid.hpp
fem/multigrid.cpp

Public Types

Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation