Represents 2x2 symmetric matrix, used as weight matrix. More...

#include <msm_wt_mat_2d.h>

Public Member Functions
	msm_wt_mat_2d ()
	msm_wt_mat_2d (double m11, double m12, double m22)
	~msm_wt_mat_2d ()
void	set_axes (double u1, double u2, double s1, double s2)
	Sets axis (eigenvector) of matrix and var along each.
double	m11 () const
double	m12 () const
double	m21 () const
double	m22 () const
double	det () const
void	eigen_values (double &EV1, double &EV2)
	Calculate eigenvalues.
msm_wt_mat_2d	transform_by (double a, double b) const
	Calculates W2=T'WT where T is 2x2 matrix (a,-b;b,a).
double	xWx (double x, double y) const
	Compute (x y)W(x y)'.
msm_wt_mat_2d	operator* (msm_wt_mat_2d &W) const
	Post multiply by W.
msm_wt_mat_2d &	operator*= (double s)
	Multiply this by scalar.
msm_wt_mat_2d &	operator+= (const msm_wt_mat_2d &W)
	Add W to this.
msm_wt_mat_2d	inverse () const
	Returns inverse (or pseudo-inverse).
void	print_summary (vcl_ostream &os) const
	Print class to os.
void	b_write (vsl_b_ostream &bfs) const
	Save class to binary file stream.
void	b_read (vsl_b_istream &bfs)
	Load class from binary file stream.
bool	operator== (const msm_wt_mat_2d &wt_mat)
	Equality test.
Private Attributes
double	m11_
double	m12_
double	m22_

Detailed Description

Represents 2x2 symmetric matrix, used as weight matrix.

Stores the 3 unique elements and contains various utility functions.

Definition at line 16 of file msm_wt_mat_2d.h.

Constructor & Destructor Documentation

msm_wt_mat_2d::msm_wt_mat_2d ( ) [inline]

Definition at line 23 of file msm_wt_mat_2d.h.

msm_wt_mat_2d::msm_wt_mat_2d	(	double	m11,
		double	m12,
		double	m22
	)		`[inline]`

Definition at line 27 of file msm_wt_mat_2d.h.

msm_wt_mat_2d::~msm_wt_mat_2d ( ) [inline]

Definition at line 32 of file msm_wt_mat_2d.h.

Member Function Documentation

void msm_wt_mat_2d::b_read ( vsl_b_istream & bfs )

Load class from binary file stream.

Definition at line 117 of file msm_wt_mat_2d.cxx.

void msm_wt_mat_2d::b_write ( vsl_b_ostream & bfs ) const

Save class to binary file stream.

Definition at line 107 of file msm_wt_mat_2d.cxx.

double msm_wt_mat_2d::det ( ) const [inline]

Definition at line 47 of file msm_wt_mat_2d.h.

void msm_wt_mat_2d::eigen_values	(	double &	EV1,
		double &	EV2
	)

Calculate eigenvalues.

Definition at line 42 of file msm_wt_mat_2d.cxx.

msm_wt_mat_2d msm_wt_mat_2d::inverse ( ) const

Returns inverse (or pseudo-inverse).

Definition at line 29 of file msm_wt_mat_2d.cxx.

double msm_wt_mat_2d::m11 ( ) const [inline]

Definition at line 41 of file msm_wt_mat_2d.h.

double msm_wt_mat_2d::m12 ( ) const [inline]

Definition at line 42 of file msm_wt_mat_2d.h.

double msm_wt_mat_2d::m21 ( ) const [inline]

Definition at line 43 of file msm_wt_mat_2d.h.

double msm_wt_mat_2d::m22 ( ) const [inline]

Definition at line 44 of file msm_wt_mat_2d.h.

msm_wt_mat_2d msm_wt_mat_2d::operator* ( msm_wt_mat_2d & W ) const

Post multiply by W.

Definition at line 61 of file msm_wt_mat_2d.cxx.

msm_wt_mat_2d & msm_wt_mat_2d::operator*= ( double s )

Multiply this by scalar.

Definition at line 69 of file msm_wt_mat_2d.cxx.

msm_wt_mat_2d & msm_wt_mat_2d::operator+= ( const msm_wt_mat_2d & W )

Add W to this.

Definition at line 78 of file msm_wt_mat_2d.cxx.

bool msm_wt_mat_2d::operator== ( const msm_wt_mat_2d & wt_mat )

Equality test.

Definition at line 87 of file msm_wt_mat_2d.cxx.

void msm_wt_mat_2d::print_summary ( vcl_ostream & os ) const

Print class to os.

Definition at line 99 of file msm_wt_mat_2d.cxx.

void msm_wt_mat_2d::set_axes	(	double	u1,
		double	u2,
		double	s1,
		double	s2
	)

Sets axis (eigenvector) of matrix and var along each.

Sets to s1*u*u' + s2*v*v', where u is the unit vector (u1 u2)/|u1,u2|, and v is the unit vector orthogonal to this. u is then an eigenvector with associated eigenvalue s1, v is the other eigenvector, with eigenvalue s2

Definition at line 17 of file msm_wt_mat_2d.cxx.