Freestyle::OGF::MatrixUtil Namespace Reference

Functions
void	semi_definite_symmetric_eigen (const double *mat, int n, double *eigen_vec, double *eigen_val)

Variables
static const double	EPS = 0.00001
static int	MAX_ITER = 100

Function Documentation

semi_definite_symmetric_eigen()

void Freestyle::OGF::MatrixUtil::semi_definite_symmetric_eigen	(	const double *	mat,
		int	n,
		double *	eigen_vec,
		double *	eigen_val )

computes the eigen values and eigen vectors of a semi definite symmetric matrix

Parameters

mat	The matrix stored in column symmetric storage, i.e. matrix = { m11, m12, m22, m13, m23, m33, m14, m24, m34, m44 ... } size = n(n+1)/2
eigen_vec	(return) = { v1, v2, v3, ..., vn } where vk = vk0, vk1, ..., vkn size = n^2, must be allocated by caller.
eigen_val	(return) are in decreasing order size = n, must be allocated by caller.

Definition at line 23 of file matrix_util.cpp.

References Freestyle::a, cos(), ELEM, EPS, fabs(), l, M_PI_4, MAX_ITER, v, and Freestyle::x.

Referenced by Freestyle::OGF::NormalCycle::end().

Variable Documentation

EPS

const double Freestyle::OGF::MatrixUtil::EPS = 0.00001

static

Definition at line 20 of file matrix_util.cpp.

Referenced by semi_definite_symmetric_eigen().

MAX_ITER

int Freestyle::OGF::MatrixUtil::MAX_ITER = 100

static

Definition at line 21 of file matrix_util.cpp.

Referenced by semi_definite_symmetric_eigen().