mfem::ThresholdDerefiner Class Reference

De-refinement operator using an error threshold. More...

#include <mesh_operators.hpp>

Inheritance diagram for mfem::ThresholdDerefiner:

Collaboration diagram for mfem::ThresholdDerefiner:

Public Member Functions
	ThresholdDerefiner (ErrorEstimator &est)
	Construct a ThresholdDerefiner using the given ErrorEstimator.
void	SetThreshold (real_t thresh)
	Set the de-refinement threshold. The default value is zero.
void	SetOp (int oper)
void	SetNCLimit (int nc_limit_)
	Set the maximum ratio of refinement levels of adjacent elements (0 = unlimited).
void	Reset () override
	Reset the associated estimator.
Public Member Functions inherited from mfem::MeshOperator
bool	Apply (Mesh &mesh)
	Perform the mesh operation.
bool	Stop () const
	Check if STOP action is requested, e.g. stopping criterion is satisfied.
bool	Repeat () const
	Check if REPEAT action is requested, i.e. FiniteElementSpaces and GridFunctions need to be updated, and Apply() must be called again.
bool	Continue () const
	Check if CONTINUE action is requested, i.e. FiniteElementSpaces and GridFunctions need to be updated and computations should continue.
bool	Refined () const
	Check if the mesh was refined.
bool	Derefined () const
	Check if the mesh was de-refined.
bool	Rebalanced () const
	Check if the mesh was rebalanced.
int	GetActionInfo () const
	Get the full ActionInfo value generated by the last call to Apply().
virtual	~MeshOperator ()
	The destructor is virtual.

Protected Member Functions
int	ApplyImpl (Mesh &mesh) override
	Apply the operator to the mesh.
Protected Member Functions inherited from mfem::MeshOperator
	MeshOperator ()
	Constructor to be used by derived classes.

Protected Attributes
ErrorEstimator &	estimator
real_t	threshold
int	nc_limit
int	op

Additional Inherited Members
Public Types inherited from mfem::MeshOperator
enum	Action {   NONE = 0 , CONTINUE = 1 , STOP = 2 , REPEAT = 3 ,   MASK_UPDATE = 1 , MASK_ACTION = 3 }
	Action and information constants and masks. More...
enum	Info { REFINED = 4*1 , DEREFINED = 4*2 , REBALANCED = 4*3 , MASK_INFO = ~3 }

Detailed Description

De-refinement operator using an error threshold.

This de-refinement operator marks elements in the hierarchy whose children are leaves and their combined error is below a given threshold. The errors of the children are combined by one of the following operations:

• op = 0: minimum of the errors
• op = 1: sum of the errors (default)
• op = 2: maximum of the errors.

Definition at line 274 of file mesh_operators.hpp.

Constructor & Destructor Documentation

ThresholdDerefiner()

mfem::ThresholdDerefiner::ThresholdDerefiner ( ErrorEstimator & est )

inline

Construct a ThresholdDerefiner using the given ErrorEstimator.

Definition at line 289 of file mesh_operators.hpp.

Member Function Documentation

ApplyImpl()

int mfem::ThresholdDerefiner::ApplyImpl ( Mesh & mesh )

overrideprotectedvirtual

Apply the operator to the mesh.

Returns

DEREFINED + CONTINUE if some elements were de-refined; NONE otherwise.

Implements mfem::MeshOperator.

Definition at line 158 of file mesh_operators.cpp.

Reset()

void mfem::ThresholdDerefiner::Reset ( )

inlineoverridevirtual

Reset the associated estimator.

Implements mfem::MeshOperator.

Definition at line 313 of file mesh_operators.hpp.

SetNCLimit()

void mfem::ThresholdDerefiner::SetNCLimit ( int nc_limit_ )

inline

Set the maximum ratio of refinement levels of adjacent elements (0 = unlimited).

Definition at line 306 of file mesh_operators.hpp.

SetOp()

void mfem::ThresholdDerefiner::SetOp ( int oper )

inline

Definition at line 302 of file mesh_operators.hpp.

SetThreshold()

void mfem::ThresholdDerefiner::SetThreshold ( real_t thresh )

inline

Set the de-refinement threshold. The default value is zero.

Definition at line 300 of file mesh_operators.hpp.

Member Data Documentation

estimator

ErrorEstimator& mfem::ThresholdDerefiner::estimator

protected

Definition at line 277 of file mesh_operators.hpp.

nc_limit

int mfem::ThresholdDerefiner::nc_limit

protected

Definition at line 280 of file mesh_operators.hpp.

op

int mfem::ThresholdDerefiner::op

protected

Definition at line 280 of file mesh_operators.hpp.

threshold

real_t mfem::ThresholdDerefiner::threshold

protected

Definition at line 279 of file mesh_operators.hpp.

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

• mesh/mesh_operators.hpp
• mesh/mesh_operators.cpp