Belos::details Namespace Reference

Classes
class	MultiVecTsqrAdapter
	TSQR adapter for MultiVec. More...
class	ProjectedLeastSquaresProblem
	"Container" for the GMRES projected least-squares problem. More...
class	LocalDenseMatrixOps
	Low-level operations on non-distributed dense matrices. More...
class	ProjectedLeastSquaresSolver
	Methods for solving GMRES' projected least-squares problem. More...
class	StubTsqrAdapter
	"Stub" TSQR adaptor for unsupported multivector types. More...

Enumerations
enum	ERobustness { ROBUSTNESS_NONE, ROBUSTNESS_SOME, ROBUSTNESS_LOTS, ROBUSTNESS_INVALID }
	Robustness level of projected least-squares solver operations. More...

Functions
std::string	robustnessEnumToString (const ERobustness x)
	Convert the given ERobustness enum value to a string. More...
ERobustness	robustnessStringToEnum (const std::string &x)
	Convert the given robustness string value to an ERobustness enum. More...
Teuchos::RCP < Teuchos::ParameterEntryValidator >	robustnessValidator ()
	Make a ParameterList validator for ERobustness. More...

Enumeration Type Documentation

enum Belos::details::ERobustness

Robustness level of projected least-squares solver operations.

Author

Mark Hoemmen

"Robustness" refers in particular to dense triangular solves. ROBUSTNESS_NONE means use the BLAS' _TRSM, which may result in inaccurate or invalid (e.g., NaN or Inf) results if the upper triangular matrix R is singular. ROBUSTNESS_LOTS means use an SVD-based least-squares solver for upper triangular solves. This will work even if R is singular, but is much more expensive than _TRSM (in fact, it's at least N times more expensive, where N is the number of columns in R). ROBUSTNESS_SOME means some algorithmic point in between those two extremes.

The projected least-squares solver may use this enum to control the robustness of other operations besides dense triangular solves.

Enumerator
ROBUSTNESS_NONE
ROBUSTNESS_SOME
ROBUSTNESS_LOTS
ROBUSTNESS_INVALID

Definition at line 800 of file BelosProjectedLeastSquaresSolver.hpp.

Function Documentation

std::string Belos::details::robustnessEnumToString ( const ERobustness  x )

inline

Convert the given ERobustness enum value to a string.

Definition at line 809 of file BelosProjectedLeastSquaresSolver.hpp.

ERobustness Belos::details::robustnessStringToEnum ( const std::string &  x )

inline

Convert the given robustness string value to an ERobustness enum.

Definition at line 820 of file BelosProjectedLeastSquaresSolver.hpp.

Teuchos::RCP<Teuchos::ParameterEntryValidator> Belos::details::robustnessValidator ( )

inline

Make a ParameterList validator for ERobustness.

Use this validator when you are setting up a default ParameterList for a solver that accepts a ERobustness parameter. This will let users supply a string that turns into an enum value.

The validator converts strings ("None", "Some", "Lots") to the corresponding ERobustness enum values. It also includes documentation for each value.

Definition at line 843 of file BelosProjectedLeastSquaresSolver.hpp.