JMATH::JSVD3D::JGivens Struct Reference

Givens quaternion. More...

Public Member Functions
	JGivens (const double a, const double b)
	Constructor. More...
double	geta () const
	get new a value More...
double	getb () const
	get new b value More...

Public Attributes
double	ch
	cosine rotation angle More...
double	sh
	sine rotation angle More...

Static Public Attributes
static constexpr double	EPSILON = 1.0e-6

Detailed Description

Givens quaternion.

Definition at line 374 of file JSVD3D.hh.

Constructor & Destructor Documentation

JMATH::JSVD3D::JGivens::JGivens ( const double  a, const double  b  )

inline

Constructor.

Parameters

a	pivot point on diagonal
b	lower triangular entry we want to annihilate

Definition at line 384 of file JSVD3D.hh.

      {
        using namespace std;

        const double rho = sqrt(a*a + b*b);

        sh = rho > EPSILON ? b : 0.0;
        ch = fabs(a) + max(rho,EPSILON);

        if (a < 0.0) {
          swap(sh,ch);
        }

        const double w = 1.0 / sqrt(ch*ch + sh*sh);

        ch *= w;
        sh *= w;
      }

Member Function Documentation

double JMATH::JSVD3D::JGivens::geta ( ) const

inline

get new a value

Definition at line 404 of file JSVD3D.hh.

double JMATH::JSVD3D::JGivens::getb ( ) const

inline

get new b value

Definition at line 405 of file JSVD3D.hh.

Member Data Documentation

constexpr double JMATH::JSVD3D::JGivens::EPSILON = 1.0e-6

static

Definition at line 376 of file JSVD3D.hh.

double JMATH::JSVD3D::JGivens::ch

cosine rotation angle

Definition at line 407 of file JSVD3D.hh.

double JMATH::JSVD3D::JGivens::sh

sine rotation angle

Definition at line 408 of file JSVD3D.hh.

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

• JSVD3D.hh