SolverGMRES< VECTOR >::AdditionalData Struct Reference

#include <solver_gmres.h>

Public Member Functions
	AdditionalData (const unsigned int max_n_tmp_vectors=30, const bool right_preconditioning=false, const bool use_default_residual=true, const bool force_re_orthogonalization=false)

Public Attributes
unsigned int	max_n_tmp_vectors
bool	right_preconditioning
bool	use_default_residual
bool	force_re_orthogonalization

Detailed Description

template<class VECTOR = Vector<double>>
struct SolverGMRES< VECTOR >::AdditionalData

Standardized data struct to pipe additional data to the solver.

Definition at line 162 of file solver_gmres.h.

Constructor & Destructor Documentation

template<class VECTOR = Vector<double>>

SolverGMRES< VECTOR >::AdditionalData::AdditionalData	(	const unsigned int	max_n_tmp_vectors = 30,
		const bool	right_preconditioning = false,
		const bool	use_default_residual = true,
		const bool	force_re_orthogonalization = false
	)

Constructor. By default, set the number of temporary vectors to 30, i.e. do a restart every 28 iterations. Also set preconditioning from left, the residual of the stopping criterion to the default residual, and re-orthogonalization only if necessary.

Member Data Documentation

template<class VECTOR = Vector<double>>

unsigned int SolverGMRES< VECTOR >::AdditionalData::max_n_tmp_vectors

Maximum number of temporary vectors. This parameter controls the size of the Arnoldi basis, which for historical reasons is max_n_tmp_vectors-2.

Definition at line 180 of file solver_gmres.h.

template<class VECTOR = Vector<double>>

bool SolverGMRES< VECTOR >::AdditionalData::right_preconditioning

Flag for right preconditioning.

Note

Change between left and right preconditioning will also change the way residuals are evaluated. See the corresponding section in the SolverGMRES.

Definition at line 189 of file solver_gmres.h.

template<class VECTOR = Vector<double>>

bool SolverGMRES< VECTOR >::AdditionalData::use_default_residual

Flag for the default residual that is used to measure convergence.

Definition at line 194 of file solver_gmres.h.

template<class VECTOR = Vector<double>>

bool SolverGMRES< VECTOR >::AdditionalData::force_re_orthogonalization

Flag to force re-orthogonalization of orthonormal basis in every step. If set to false, the solver automatically checks for loss of orthogonality every 5 iterations and enables re-orthogonalization only if necessary.

Definition at line 202 of file solver_gmres.h.

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The documentation for this struct was generated from the following file:

• include/deal.II/lac/solver_gmres.h