Teuchos::details::GivensRotator< ScalarType, false > Class Template Reference

#include <Teuchos_BLAS.hpp>

List of all members.

Public Member Functions
void	ROTG (ScalarType *da, ScalarType *db, ScalarType *c, ScalarType *s) const
Private Member Functions
ScalarType	SIGN (ScalarType x, ScalarType y) const

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Detailed Description

template<typename ScalarType>
class Teuchos::details::GivensRotator< ScalarType, false >

Definition at line 307 of file Teuchos_BLAS.hpp.

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Member Function Documentation

template<typename ScalarType >

void Teuchos::details::GivensRotator< ScalarType, false >::ROTG	(	ScalarType *	da,
		ScalarType *	db,
		ScalarType *	c,
		ScalarType *	s
	)		const

Definition at line 418 of file Teuchos_BLAS.hpp.

template<typename ScalarType >

ScalarType Teuchos::details::GivensRotator< ScalarType, false >::SIGN	(	ScalarType	x,
		ScalarType	y
	)		const [inline, private]

Return ABS(x) if y > 0 or y is +0, else -ABS(x) (if y is -0 or < 0).

Note that SIGN respects IEEE 754 floating-point signed zero. This is a hopefully correct implementation of the Fortran type-generic SIGN intrinsic. ROTG for complex arithmetic doesn't require this function. C99 provides a copysign() math library function, but we are not able to rely on the existence of C99 functions here.

We provide this method on purpose only for the real-arithmetic specialization of GivensRotator. Complex numbers don't have a sign; they have an angle.

Definition at line 327 of file Teuchos_BLAS.hpp.

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

• Teuchos_BLAS.hpp