mfem::BilinearForm Class Reference

#include <bilinearform.hpp>

Inheritance diagram for mfem::BilinearForm:

Collaboration diagram for mfem::BilinearForm:

Public Member Functions
	BilinearForm (FiniteElementSpace *f)
	Creates bilinear form associated with FE space *f. More...
	BilinearForm (FiniteElementSpace *f, BilinearForm *bf, int ps=0)
	Create a BilinearForm on the FiniteElementSpace f, using the same integrators as the BilinearForm bf. More...
int	Size () const
	Get the size of the BilinearForm as a square matrix. More...
void	SetAssemblyLevel (AssemblyLevel assembly_level)
	Set the desired assembly level. The default is AssemblyLevel::FULL. More...
void	EnableStaticCondensation ()
bool	StaticCondensationIsEnabled () const
FiniteElementSpace *	SCFESpace () const
	Return the trace FE space associated with static condensation. More...
void	EnableHybridization (FiniteElementSpace *constr_space, BilinearFormIntegrator *constr_integ, const Array< int > &ess_tdof_list)
void	UsePrecomputedSparsity (int ps=1)
void	UseSparsity (int *I, int *J, bool isSorted)
	Use the given CSR sparsity pattern to allocate the internal SparseMatrix. More...
void	UseSparsity (SparseMatrix &A)
	Use the sparsity of A to allocate the internal SparseMatrix. More...
void	AllocateMatrix ()
Array< BilinearFormIntegrator * > *	GetDBFI ()
	Access all integrators added with AddDomainIntegrator(). More...
Array< BilinearFormIntegrator * > *	GetBBFI ()
	Access all integrators added with AddBoundaryIntegrator(). More...
Array< Array< int > * > *	GetBBFI_Marker ()
	Access all boundary markers added with AddBoundaryIntegrator(). If no marker was specified when the integrator was added, the corresponding pointer (to Array<int>) will be NULL. More...
Array< BilinearFormIntegrator * > *	GetFBFI ()
	Access all integrators added with AddInteriorFaceIntegrator(). More...
Array< BilinearFormIntegrator * > *	GetBFBFI ()
	Access all integrators added with AddBdrFaceIntegrator(). More...
Array< Array< int > * > *	GetBFBFI_Marker ()
	Access all boundary markers added with AddBdrFaceIntegrator(). If no marker was specified when the integrator was added, the corresponding pointer (to Array<int>) will be NULL. More...
const double &	operator() (int i, int j)
virtual double &	Elem (int i, int j)
	Returns reference to a_{ij}. More...
virtual const double &	Elem (int i, int j) const
	Returns constant reference to a_{ij}. More...
virtual void	Mult (const Vector &x, Vector &y) const
	Matrix vector multiplication. More...
void	FullMult (const Vector &x, Vector &y) const
virtual void	AddMult (const Vector &x, Vector &y, const double a=1.0) const
void	FullAddMult (const Vector &x, Vector &y) const
virtual void	AddMultTranspose (const Vector &x, Vector &y, const double a=1.0) const
void	FullAddMultTranspose (const Vector &x, Vector &y) const
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...
double	InnerProduct (const Vector &x, const Vector &y) const
virtual MatrixInverse *	Inverse () const
	Returns a pointer to (approximation) of the matrix inverse. More...
virtual void	Finalize (int skip_zeros=1)
	Finalizes the matrix initialization. More...
const SparseMatrix &	SpMat () const
	Returns a reference to the sparse matrix. More...
SparseMatrix &	SpMat ()
SparseMatrix *	LoseMat ()
const SparseMatrix &	SpMatElim () const
	Returns a reference to the sparse matrix of eliminated b.c. More...
SparseMatrix &	SpMatElim ()
void	AddDomainIntegrator (BilinearFormIntegrator *bfi)
	Adds new Domain Integrator. Assumes ownership of bfi. More...
void	AddBoundaryIntegrator (BilinearFormIntegrator *bfi)
	Adds new Boundary Integrator. Assumes ownership of bfi. More...
void	AddBoundaryIntegrator (BilinearFormIntegrator *bfi, Array< int > &bdr_marker)
	Adds new Boundary Integrator, restricted to specific boundary attributes. More...
void	AddInteriorFaceIntegrator (BilinearFormIntegrator *bfi)
	Adds new interior Face Integrator. Assumes ownership of bfi. More...
void	AddBdrFaceIntegrator (BilinearFormIntegrator *bfi)
	Adds new boundary Face Integrator. Assumes ownership of bfi. More...
void	AddBdrFaceIntegrator (BilinearFormIntegrator *bfi, Array< int > &bdr_marker)
	Adds new boundary Face Integrator, restricted to specific boundary attributes. More...
void	operator= (const double a)
void	Assemble (int skip_zeros=1)
	Assembles the form i.e. sums over all domain/bdr integrators. More...
virtual const Operator *	GetProlongation () const
	Get the finite element space prolongation matrix. More...
virtual const Operator *	GetRestriction () const
	Get the finite element space restriction matrix. More...
virtual void	FormLinearSystem (const Array< int > &ess_tdof_list, Vector &x, Vector &b, OperatorHandle &A, Vector &X, Vector &B, int copy_interior=0)
	Form the linear system A X = B, corresponding to this bilinear form and the linear form b(.). More...
template<typename OpType >
void	FormLinearSystem (const Array< int > &ess_tdof_list, Vector &x, Vector &b, OpType &A, Vector &X, Vector &B, int copy_interior=0)
	Form the linear system A X = B, corresponding to this bilinear form and the linear form b(.). More...
virtual void	FormSystemMatrix (const Array< int > &ess_tdof_list, OperatorHandle &A)
	Form the linear system matrix A, see FormLinearSystem() for details. More...
template<typename OpType >
void	FormSystemMatrix (const Array< int > &ess_tdof_list, OpType &A)
	Form the linear system matrix A, see FormLinearSystem() for details. More...
virtual void	RecoverFEMSolution (const Vector &X, const Vector &b, Vector &x)
	Recover the solution of a linear system formed with FormLinearSystem(). More...
void	ComputeElementMatrices ()
	Compute and store internally all element matrices. More...
void	FreeElementMatrices ()
	Free the memory used by the element matrices. More...
void	ComputeElementMatrix (int i, DenseMatrix &elmat)
void	AssembleElementMatrix (int i, const DenseMatrix &elmat, Array< int > &vdofs, int skip_zeros=1)
void	AssembleBdrElementMatrix (int i, const DenseMatrix &elmat, Array< int > &vdofs, int skip_zeros=1)
void	EliminateEssentialBC (const Array< int > &bdr_attr_is_ess, const Vector &sol, Vector &rhs, DiagonalPolicy dpolicy=DIAG_ONE)
	Eliminate essential boundary DOFs from the system. More...
void	EliminateEssentialBC (const Array< int > &bdr_attr_is_ess, DiagonalPolicy dpolicy=DIAG_ONE)
	Eliminate essential boundary DOFs from the system matrix. More...
void	EliminateEssentialBCDiag (const Array< int > &bdr_attr_is_ess, double value)
	Perform elimination and set the diagonal entry to the given value. More...
void	EliminateVDofs (const Array< int > &vdofs, const Vector &sol, Vector &rhs, DiagonalPolicy dpolicy=DIAG_ONE)
	Eliminate the given vdofs. NOTE: here, vdofs is a list of DOFs. More...
void	EliminateVDofs (const Array< int > &vdofs, DiagonalPolicy dpolicy=DIAG_ONE)
	Eliminate the given vdofs, storing the eliminated part internally. More...
void	EliminateEssentialBCFromDofs (const Array< int > &ess_dofs, const Vector &sol, Vector &rhs, DiagonalPolicy dpolicy=DIAG_ONE)
	Similar to EliminateVDofs(const Array<int> &, const Vector &, Vector &, DiagonalPolicy) but here ess_dofs is a marker (boolean) array on all vector-dofs (ess_dofs[i] < 0 is true). More...
void	EliminateEssentialBCFromDofs (const Array< int > &ess_dofs, DiagonalPolicy dpolicy=DIAG_ONE)
	Similar to EliminateVDofs(const Array<int> &, DiagonalPolicy) but here ess_dofs is a marker (boolean) array on all vector-dofs (ess_dofs[i] < 0 is true). More...
void	EliminateEssentialBCFromDofsDiag (const Array< int > &ess_dofs, double value)
	Perform elimination and set the diagonal entry to the given value. More...
void	EliminateVDofsInRHS (const Array< int > &vdofs, const Vector &x, Vector &b)
	Use the stored eliminated part of the matrix (see EliminateVDofs(const Array<int> &, DiagonalPolicy)) to modify the r.h.s. b; vdofs is a list of DOFs (non-directional, i.e. >= 0). More...
double	FullInnerProduct (const Vector &x, const Vector &y) const
virtual void	Update (FiniteElementSpace *nfes=NULL)
FiniteElementSpace *	GetFES ()
	(DEPRECATED) Return the FE space associated with the BilinearForm. More...
FiniteElementSpace *	FESpace ()
	Return the FE space associated with the BilinearForm. More...
const FiniteElementSpace *	FESpace () const
	Read-only access to the associated FiniteElementSpace. More...
void	SetDiagonalPolicy (DiagonalPolicy policy)
	Sets diagonal policy used upon construction of the linear system. More...
virtual	~BilinearForm ()
	Destroys bilinear form. More...
Public Member Functions inherited from mfem::Matrix
	Matrix (int s)
	Creates a square matrix of size s. More...
	Matrix (int h, int w)
	Creates a matrix of the given height and width. More...
virtual void	Print (std::ostream &out=mfem::out, int width_=4) const
	Prints matrix to stream out. More...
virtual	~Matrix ()
	Destroys matrix. More...
Public Member Functions inherited from mfem::Operator
	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 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...
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	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 Member Functions
void	AllocMat ()
void	ConformingAssemble ()
	BilinearForm ()

Protected Attributes
SparseMatrix *	mat
	Sparse matrix to be associated with the form. Owned. More...
SparseMatrix *	mat_e
	Matrix used to eliminate b.c. Owned. More...
FiniteElementSpace *	fes
	FE space on which the form lives. Not owned. More...
AssemblyLevel	assembly
	The form assembly level (full, partial, etc.) More...
int	batch
	Element batch size used in the form action (1, 8, num_elems, etc.) More...
BilinearFormExtension *	ext
long	sequence
int	extern_bfs
	Indicates the BilinearFormIntegrators stored in dbfi, bbfi, fbfi, and bfbfi are owned by another BilinearForm. More...
Array< BilinearFormIntegrator * >	dbfi
	Set of Domain Integrators to be applied. More...
Array< BilinearFormIntegrator * >	bbfi
	Set of Boundary Integrators to be applied. More...
Array< Array< int > * >	bbfi_marker
	Entries are not owned. More...
Array< BilinearFormIntegrator * >	fbfi
	Set of interior face Integrators to be applied. More...
Array< BilinearFormIntegrator * >	bfbfi
	Set of boundary face Integrators to be applied. More...
Array< Array< int > * >	bfbfi_marker
	Entries are not owned. More...
DenseMatrix	elemmat
Array< int >	vdofs
DenseTensor *	element_matrices
	Owned. More...
StaticCondensation *	static_cond
	Owned. More...
Hybridization *	hybridization
	Owned. More...
DiagonalPolicy	diag_policy
int	precompute_sparsity
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 Types inherited from mfem::Matrix
enum	DiagonalPolicy { DIAG_ZERO, DIAG_ONE, DIAG_KEEP }
Public Types inherited from mfem::Operator
enum	Type {   ANY_TYPE, MFEM_SPARSEMAT, Hypre_ParCSR, PETSC_MATAIJ,   PETSC_MATIS, PETSC_MATSHELL, PETSC_MATNEST, PETSC_MATHYPRE,   PETSC_MATGENERIC }
	Enumeration defining IDs for some classes derived from Operator. More...

Detailed Description

Class for bilinear form - "Matrix" with associated FE space and BLFIntegrators.

Definition at line 49 of file bilinearform.hpp.

Constructor & Destructor Documentation

mfem::BilinearForm::BilinearForm ( )

inlineprotected

Definition at line 113 of file bilinearform.hpp.

mfem::BilinearForm::BilinearForm

(

FiniteElementSpace *

f

)

Creates bilinear form associated with FE space *f.

The pointer f is not owned by the newly constructed object.

Definition at line 66 of file bilinearform.cpp.

mfem::BilinearForm::BilinearForm	(	FiniteElementSpace *	f,
		BilinearForm *	bf,
		int	ps = 0
	)

Create a BilinearForm on the FiniteElementSpace f, using the same integrators as the BilinearForm bf.

The pointer f is not owned by the newly constructed object.

The integrators in bf are copied as pointers and they are not owned by the newly constructed BilinearForm.

The optional parameter ps is used to initialize the internal flag precompute_sparsity, see UsePrecomputedSparsity() for details.

Definition at line 84 of file bilinearform.cpp.

mfem::BilinearForm::~BilinearForm ( )

virtual

Destroys bilinear form.

Definition at line 977 of file bilinearform.cpp.

Member Function Documentation

void mfem::BilinearForm::AddBdrFaceIntegrator

(

BilinearFormIntegrator *

bfi

)

Adds new boundary Face Integrator. Assumes ownership of bfi.

Definition at line 256 of file bilinearform.cpp.

void mfem::BilinearForm::AddBdrFaceIntegrator	(	BilinearFormIntegrator *	bfi,
		Array< int > &	bdr_marker
	)

Adds new boundary Face Integrator, restricted to specific boundary attributes.

Assumes ownership of bfi. The array bdr_marker is stored internally as a pointer to the given Array<int> object.

Definition at line 262 of file bilinearform.cpp.

void mfem::BilinearForm::AddBoundaryIntegrator

(

BilinearFormIntegrator *

bfi

)

Adds new Boundary Integrator. Assumes ownership of bfi.

Definition at line 238 of file bilinearform.cpp.

void mfem::BilinearForm::AddBoundaryIntegrator	(	BilinearFormIntegrator *	bfi,
		Array< int > &	bdr_marker
	)

Adds new Boundary Integrator, restricted to specific boundary attributes.

Assumes ownership of bfi. The array bdr_marker is stored internally as a pointer to the given Array<int> object.

Definition at line 244 of file bilinearform.cpp.

void mfem::BilinearForm::AddDomainIntegrator

(

BilinearFormIntegrator *

bfi

)

Adds new Domain Integrator. Assumes ownership of bfi.

Definition at line 233 of file bilinearform.cpp.

void mfem::BilinearForm::AddInteriorFaceIntegrator

(

BilinearFormIntegrator *

bfi

)

Adds new interior Face Integrator. Assumes ownership of bfi.

Definition at line 251 of file bilinearform.cpp.

virtual void mfem::BilinearForm::AddMult ( const Vector &  x, Vector &  y, const double  a = 1.0  ) const

inlinevirtual

Definition at line 235 of file bilinearform.hpp.

virtual void mfem::BilinearForm::AddMultTranspose ( const Vector &  x, Vector &  y, const double  a = 1.0  ) const

inlinevirtual

Definition at line 241 of file bilinearform.hpp.

void mfem::BilinearForm::AllocateMatrix ( )

inline

Pre-allocate the internal SparseMatrix before assembly. If the flag 'precompute sparsity' is set, the matrix is allocated in CSR format (i.e. finalized) and the entries are initialized with zeros.

Definition at line 199 of file bilinearform.hpp.

void mfem::BilinearForm::AllocMat ( )

protected

Definition at line 21 of file bilinearform.cpp.

void mfem::BilinearForm::Assemble

(

int

skip_zeros = 1

)

Assembles the form i.e. sums over all domain/bdr integrators.

Definition at line 341 of file bilinearform.cpp.

void mfem::BilinearForm::AssembleBdrElementMatrix	(	int	i,
		const DenseMatrix &	elmat,
		Array< int > &	vdofs,
		int	skip_zeros = 1
	)

Definition at line 319 of file bilinearform.cpp.

void mfem::BilinearForm::AssembleElementMatrix	(	int	i,
		const DenseMatrix &	elmat,
		Array< int > &	vdofs,
		int	skip_zeros = 1
	)

Definition at line 297 of file bilinearform.cpp.

void mfem::BilinearForm::ComputeElementMatrices

(

)

Compute and store internally all element matrices.

Definition at line 750 of file bilinearform.cpp.

void mfem::BilinearForm::ComputeElementMatrix	(	int	i,
		DenseMatrix &	elmat
	)

Definition at line 269 of file bilinearform.cpp.

void mfem::BilinearForm::ConformingAssemble ( )

protected

Definition at line 543 of file bilinearform.cpp.

double & mfem::BilinearForm::Elem ( int  i, int  j  )

virtual

Returns reference to a_{ij}.

Implements mfem::Matrix.

Definition at line 210 of file bilinearform.cpp.

const double & mfem::BilinearForm::Elem ( int  i, int  j  ) const

virtual

Returns constant reference to a_{ij}.

Implements mfem::Matrix.

Definition at line 215 of file bilinearform.cpp.

void mfem::BilinearForm::EliminateEssentialBC	(	const Array< int > &	bdr_attr_is_ess,
		const Vector &	sol,
		Vector &	rhs,
		DiagonalPolicy	dpolicy = DIAG_ONE
	)

Eliminate essential boundary DOFs from the system.

The array bdr_attr_is_ess marks boundary attributes that constitute the essential part of the boundary. By default, the diagonal at the essential DOFs is set to 1.0. This behavior is controlled by the argument dpolicy.

Definition at line 792 of file bilinearform.cpp.

void mfem::BilinearForm::EliminateEssentialBC	(	const Array< int > &	bdr_attr_is_ess,
		DiagonalPolicy	dpolicy = DIAG_ONE
	)

Eliminate essential boundary DOFs from the system matrix.

Definition at line 810 of file bilinearform.cpp.

void mfem::BilinearForm::EliminateEssentialBCDiag	(	const Array< int > &	bdr_attr_is_ess,
		double	value
	)

Perform elimination and set the diagonal entry to the given value.

Definition at line 827 of file bilinearform.cpp.

void mfem::BilinearForm::EliminateEssentialBCFromDofs	(	const Array< int > &	ess_dofs,
		const Vector &	sol,
		Vector &	rhs,
		DiagonalPolicy	dpolicy = DIAG_ONE
	)

Similar to EliminateVDofs(const Array<int> &, const Vector &, Vector &, DiagonalPolicy) but here ess_dofs is a marker (boolean) array on all vector-dofs (ess_dofs[i] < 0 is true).

Definition at line 884 of file bilinearform.cpp.

void mfem::BilinearForm::EliminateEssentialBCFromDofs	(	const Array< int > &	ess_dofs,
		DiagonalPolicy	dpolicy = DIAG_ONE
	)

Similar to EliminateVDofs(const Array<int> &, DiagonalPolicy) but here ess_dofs is a marker (boolean) array on all vector-dofs (ess_dofs[i] < 0 is true).

Definition at line 899 of file bilinearform.cpp.

void mfem::BilinearForm::EliminateEssentialBCFromDofsDiag	(	const Array< int > &	ess_dofs,
		double	value
	)

Perform elimination and set the diagonal entry to the given value.

Definition at line 911 of file bilinearform.cpp.

void mfem::BilinearForm::EliminateVDofs	(	const Array< int > &	vdofs,
		const Vector &	sol,
		Vector &	rhs,
		DiagonalPolicy	dpolicy = DIAG_ONE
	)

Eliminate the given vdofs. NOTE: here, vdofs is a list of DOFs.

Definition at line 844 of file bilinearform.cpp.

void mfem::BilinearForm::EliminateVDofs	(	const Array< int > &	vdofs,
		DiagonalPolicy	dpolicy = DIAG_ONE
	)

Eliminate the given vdofs, storing the eliminated part internally.

This method works in conjunction with EliminateVDofsInRHS() and allows elimination of boundary conditions in multiple right-hand sides. In this method, vdofs is a list of DOFs.

Definition at line 862 of file bilinearform.cpp.

void mfem::BilinearForm::EliminateVDofsInRHS	(	const Array< int > &	vdofs,
		const Vector &	x,
		Vector &	b
	)

Use the stored eliminated part of the matrix (see EliminateVDofs(const Array<int> &, DiagonalPolicy)) to modify the r.h.s. b; vdofs is a list of DOFs (non-directional, i.e. >= 0).

Definition at line 923 of file bilinearform.cpp.

void mfem::BilinearForm::EnableHybridization	(	FiniteElementSpace *	constr_space,
		BilinearFormIntegrator *	constr_integ,
		const Array< int > &	ess_tdof_list
	)

Enable hybridization; for details see the description for class Hybridization in fem/hybridization.hpp. This method should be called before assembly.

Definition at line 167 of file bilinearform.cpp.

void mfem::BilinearForm::EnableStaticCondensation

(

)

Enable the use of static condensation. For details see the description for class StaticCondensation in fem/staticcond.hpp This method should be called before assembly. If the number of unknowns after static condensation is not reduced, it is not enabled.

Definition at line 144 of file bilinearform.cpp.

FiniteElementSpace* mfem::BilinearForm::FESpace ( )

inline

Return the FE space associated with the BilinearForm.

Definition at line 481 of file bilinearform.hpp.

const FiniteElementSpace* mfem::BilinearForm::FESpace ( ) const

inline

Read-only access to the associated FiniteElementSpace.

Definition at line 483 of file bilinearform.hpp.

void mfem::BilinearForm::Finalize ( int  skip_zeros = 1 )

virtual

Finalizes the matrix initialization.

Reimplemented from mfem::Matrix.

Definition at line 225 of file bilinearform.cpp.

void mfem::BilinearForm::FormLinearSystem ( const Array< int > &  ess_tdof_list, Vector &  x, Vector &  b, OperatorHandle &  A, Vector &  X, Vector &  B, int  copy_interior = 0  )

virtual

Form the linear system A X = B, corresponding to this bilinear form and the linear form b(.).

This method applies any necessary transformations to the linear system such as: eliminating boundary conditions; applying conforming constraints for non-conforming AMR; parallel assembly; static condensation; hybridization.

The GridFunction-size vector x must contain the essential b.c. The BilinearForm and the LinearForm-size vector b must be assembled.

The vector X is initialized with a suitable initial guess: when using hybridization, the vector X is set to zero; otherwise, the essential entries of X are set to the corresponding b.c. and all other entries are set to zero (copy_interior == 0) or copied from x (copy_interior != 0).

This method can be called multiple times (with the same ess_tdof_list array) to initialize different right-hand sides and boundary condition values.

After solving the linear system, the finite element solution x can be recovered by calling RecoverFEMSolution() (with the same vectors X, b, and x).

NOTE: If there are no transformations, X simply reuses the data of x.

Reimplemented in mfem::ParBilinearForm.

Definition at line 578 of file bilinearform.cpp.

template<typename OpType >

void mfem::BilinearForm::FormLinearSystem ( const Array< int > &  ess_tdof_list, Vector &  x, Vector &  b, OpType &  A, Vector &  X, Vector &  B, int  copy_interior = 0  )

inline

Form the linear system A X = B, corresponding to this bilinear form and the linear form b(.).

Version of the method FormLinearSystem() where the system matrix is returned in the variable A, of type OpType, holding a reference to the system matrix (created with the method OpType::MakeRef()). The reference will be invalidated when SetOperatorType(), Update(), or the destructor is called.

Currently, this method can be used only with AssemblyLevel::FULL.

Definition at line 369 of file bilinearform.hpp.

void mfem::BilinearForm::FormSystemMatrix ( const Array< int > &  ess_tdof_list, OperatorHandle &  A  )

virtual

Form the linear system matrix A, see FormLinearSystem() for details.

Reimplemented in mfem::ParBilinearForm.

Definition at line 649 of file bilinearform.cpp.

template<typename OpType >

void mfem::BilinearForm::FormSystemMatrix ( const Array< int > &  ess_tdof_list, OpType &  A  )

inline

Form the linear system matrix A, see FormLinearSystem() for details.

Version of the method FormSystemMatrix() where the system matrix is returned in the variable A, of type OpType, holding a reference to the system matrix (created with the method OpType::MakeRef()). The reference will be invalidated when SetOperatorType(), Update(), or the destructor is called.

Currently, this method can be used only with AssemblyLevel::FULL.

Definition at line 393 of file bilinearform.hpp.

void mfem::BilinearForm::FreeElementMatrices ( )

inline

Free the memory used by the element matrices.

Definition at line 413 of file bilinearform.hpp.

void mfem::BilinearForm::FullAddMult ( const Vector &  x, Vector &  y  ) const

inline

Definition at line 238 of file bilinearform.hpp.

void mfem::BilinearForm::FullAddMultTranspose ( const Vector &  x, Vector &  y  ) const

inline

Definition at line 245 of file bilinearform.hpp.

double mfem::BilinearForm::FullInnerProduct ( const Vector &  x, const Vector &  y  ) const

inline

Definition at line 471 of file bilinearform.hpp.

void mfem::BilinearForm::FullMult ( const Vector &  x, Vector &  y  ) const

inline

Definition at line 232 of file bilinearform.hpp.

Array<BilinearFormIntegrator*>* mfem::BilinearForm::GetBBFI ( )

inline

Access all integrators added with AddBoundaryIntegrator().

Definition at line 205 of file bilinearform.hpp.

Array<Array<int>*>* mfem::BilinearForm::GetBBFI_Marker ( )

inline

Access all boundary markers added with AddBoundaryIntegrator(). If no marker was specified when the integrator was added, the corresponding pointer (to Array<int>) will be NULL.

Definition at line 209 of file bilinearform.hpp.

Array<BilinearFormIntegrator*>* mfem::BilinearForm::GetBFBFI ( )

inline

Access all integrators added with AddBdrFaceIntegrator().

Definition at line 215 of file bilinearform.hpp.

Array<Array<int>*>* mfem::BilinearForm::GetBFBFI_Marker ( )

inline

Access all boundary markers added with AddBdrFaceIntegrator(). If no marker was specified when the integrator was added, the corresponding pointer (to Array<int>) will be NULL.

Definition at line 219 of file bilinearform.hpp.

Array<BilinearFormIntegrator*>* mfem::BilinearForm::GetDBFI ( )

inline

Access all integrators added with AddDomainIntegrator().

Definition at line 202 of file bilinearform.hpp.

Array<BilinearFormIntegrator*>* mfem::BilinearForm::GetFBFI ( )

inline

Access all integrators added with AddInteriorFaceIntegrator().

Definition at line 212 of file bilinearform.hpp.

FiniteElementSpace* mfem::BilinearForm::GetFES ( )

inline

(DEPRECATED) Return the FE space associated with the BilinearForm.

Deprecated:

Use FESpace() instead.

Definition at line 478 of file bilinearform.hpp.

virtual const Operator* mfem::BilinearForm::GetProlongation ( ) const

inlinevirtual

Get the finite element space prolongation matrix.

Reimplemented from mfem::Operator.

Reimplemented in mfem::ParBilinearForm.

Definition at line 323 of file bilinearform.hpp.

virtual const Operator* mfem::BilinearForm::GetRestriction ( ) const

inlinevirtual

Get the finite element space restriction matrix.

Reimplemented from mfem::Operator.

Reimplemented in mfem::ParBilinearForm.

Definition at line 326 of file bilinearform.hpp.

double mfem::BilinearForm::InnerProduct ( const Vector &  x, const Vector &  y  ) const

inline

Definition at line 251 of file bilinearform.hpp.

MatrixInverse * mfem::BilinearForm::Inverse ( ) const

virtual

Returns a pointer to (approximation) of the matrix inverse.

Implements mfem::Matrix.

Definition at line 220 of file bilinearform.cpp.

SparseMatrix* mfem::BilinearForm::LoseMat ( )

inline

Definition at line 271 of file bilinearform.hpp.

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

inlinevirtual

Matrix vector multiplication.

Implements mfem::Operator.

Definition at line 230 of file bilinearform.hpp.

virtual void mfem::BilinearForm::MultTranspose ( const Vector &  x, Vector &  y  ) const

inlinevirtual

Action of the transpose operator: y=A^t(x). The default behavior in class Operator is to generate an error.

Reimplemented from mfem::Operator.

Definition at line 248 of file bilinearform.hpp.

const double& mfem::BilinearForm::operator() ( int  i, int  j  )

inline

Definition at line 221 of file bilinearform.hpp.

void mfem::BilinearForm::operator= ( const double  a )

inline

Definition at line 313 of file bilinearform.hpp.

void mfem::BilinearForm::RecoverFEMSolution ( const Vector &  X, const Vector &  b, Vector &  x  )

virtual

Recover the solution of a linear system formed with FormLinearSystem().

Call this method after solving a linear system constructed using the FormLinearSystem() method to recover the solution as a GridFunction-size vector in x. Use the same arguments as in the FormLinearSystem() call.

Reimplemented from mfem::Operator.

Reimplemented in mfem::ParBilinearForm.

Definition at line 692 of file bilinearform.cpp.

FiniteElementSpace* mfem::BilinearForm::SCFESpace ( ) const

inline

Return the trace FE space associated with static condensation.

Definition at line 167 of file bilinearform.hpp.

void mfem::BilinearForm::SetAssemblyLevel

(

AssemblyLevel

assembly_level

)

Set the desired assembly level. The default is AssemblyLevel::FULL.

This method must be called before assembly.

Definition at line 115 of file bilinearform.cpp.

void mfem::BilinearForm::SetDiagonalPolicy

(

DiagonalPolicy

policy

)

Sets diagonal policy used upon construction of the linear system.

Definition at line 972 of file bilinearform.cpp.

int mfem::BilinearForm::Size ( ) const

inline

Get the size of the BilinearForm as a square matrix.

Definition at line 150 of file bilinearform.hpp.

const SparseMatrix& mfem::BilinearForm::SpMat ( ) const

inline

Returns a reference to the sparse matrix.

Definition at line 261 of file bilinearform.hpp.

SparseMatrix& mfem::BilinearForm::SpMat ( )

inline

Definition at line 266 of file bilinearform.hpp.

const SparseMatrix& mfem::BilinearForm::SpMatElim ( ) const

inline

Returns a reference to the sparse matrix of eliminated b.c.

Definition at line 274 of file bilinearform.hpp.

SparseMatrix& mfem::BilinearForm::SpMatElim ( )

inline

Definition at line 279 of file bilinearform.hpp.

bool mfem::BilinearForm::StaticCondensationIsEnabled ( ) const

inline

Check if static condensation was actually enabled by a previous call to EnableStaticCondensation().

Definition at line 164 of file bilinearform.hpp.

void mfem::BilinearForm::Update ( FiniteElementSpace *  nfes = NULL )

virtual

Reimplemented in mfem::ParBilinearForm.

Definition at line 930 of file bilinearform.cpp.

void mfem::BilinearForm::UsePrecomputedSparsity ( int  ps = 1 )

inline

For scalar FE spaces, precompute the sparsity pattern of the matrix (assuming dense element matrices) based on the types of integrators present in the bilinear form.

Definition at line 180 of file bilinearform.hpp.

void mfem::BilinearForm::UseSparsity	(	int *	I,
		int *	J,
		bool	isSorted
	)

Use the given CSR sparsity pattern to allocate the internal SparseMatrix.

• The I and J arrays must define a square graph with size equal to GetVSize() of the associated FiniteElementSpace.
• This method should be called after enabling static condensation or hybridization, if used.
• In the case of static condensation, I and J are not used.
• The ownership of the arrays I and J remains with the caller.

Definition at line 184 of file bilinearform.cpp.

void mfem::BilinearForm::UseSparsity

(

SparseMatrix &

A

)

Use the sparsity of A to allocate the internal SparseMatrix.

Definition at line 200 of file bilinearform.cpp.

Member Data Documentation

AssemblyLevel mfem::BilinearForm::assembly

protected

The form assembly level (full, partial, etc.)

Definition at line 62 of file bilinearform.hpp.

int mfem::BilinearForm::batch

protected

Element batch size used in the form action (1, 8, num_elems, etc.)

Definition at line 64 of file bilinearform.hpp.

Array<BilinearFormIntegrator*> mfem::BilinearForm::bbfi

protected

Set of Boundary Integrators to be applied.

Definition at line 81 of file bilinearform.hpp.

Array<Array<int>*> mfem::BilinearForm::bbfi_marker

protected

Entries are not owned.

Definition at line 82 of file bilinearform.hpp.

Array<BilinearFormIntegrator*> mfem::BilinearForm::bfbfi

protected

Set of boundary face Integrators to be applied.

Definition at line 88 of file bilinearform.hpp.

Array<Array<int>*> mfem::BilinearForm::bfbfi_marker

protected

Entries are not owned.

Definition at line 89 of file bilinearform.hpp.

Array<BilinearFormIntegrator*> mfem::BilinearForm::dbfi

protected

Set of Domain Integrators to be applied.

Definition at line 78 of file bilinearform.hpp.

DiagonalPolicy mfem::BilinearForm::diag_policy

protected

This member allows one to specify what should be done to the diagonal matrix entries and corresponding RHS values upon elimination of the constrained DoFs.

Definition at line 104 of file bilinearform.hpp.

DenseTensor* mfem::BilinearForm::element_matrices

protected

Owned.

Definition at line 94 of file bilinearform.hpp.

DenseMatrix mfem::BilinearForm::elemmat

protected

Definition at line 91 of file bilinearform.hpp.

BilinearFormExtension* mfem::BilinearForm::ext

protected

Extension for supporting Full Assembly (FA), Element Assembly (EA), Partial Assembly (PA), or Matrix Free assembly (MF).

Definition at line 67 of file bilinearform.hpp.

int mfem::BilinearForm::extern_bfs

protected

Indicates the BilinearFormIntegrators stored in dbfi, bbfi, fbfi, and bfbfi are owned by another BilinearForm.

Definition at line 75 of file bilinearform.hpp.

Array<BilinearFormIntegrator*> mfem::BilinearForm::fbfi

protected

Set of interior face Integrators to be applied.

Definition at line 85 of file bilinearform.hpp.

FiniteElementSpace* mfem::BilinearForm::fes

protected

FE space on which the form lives. Not owned.

Definition at line 59 of file bilinearform.hpp.

Hybridization* mfem::BilinearForm::hybridization

protected

Owned.

Definition at line 97 of file bilinearform.hpp.

SparseMatrix* mfem::BilinearForm::mat

protected

Sparse matrix to be associated with the form. Owned.

Definition at line 53 of file bilinearform.hpp.

SparseMatrix* mfem::BilinearForm::mat_e

protected

Matrix used to eliminate b.c. Owned.

Definition at line 56 of file bilinearform.hpp.

int mfem::BilinearForm::precompute_sparsity

protected

Definition at line 106 of file bilinearform.hpp.

long mfem::BilinearForm::sequence

protected

Indicates the Mesh::sequence corresponding to the current state of the BilinearForm.

Definition at line 71 of file bilinearform.hpp.

StaticCondensation* mfem::BilinearForm::static_cond

protected

Owned.

Definition at line 96 of file bilinearform.hpp.

Array<int> mfem::BilinearForm::vdofs

protected

Definition at line 92 of file bilinearform.hpp.

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

• fem/bilinearform.hpp
• fem/bilinearform.cpp