vertex_lcfi::util Namespace Reference

Utility classes for the vertex package. More...

Classes
class	HelixRep
	Multi-Perpose 3 Vector. More...
class	SymMatrix2x2
class	Matrix2x2
class	Matrix3x3
class	Matrix5x5
class	SymMatrix6x6
class	Matrix6x6
class	SymMatrix5x5
class	SymMatrix3x3
class	bin
class	histogram_data
class	efficiency_purity
class	Vector3
	Multi-Perpose 3 Vector. More...

Enumerations
enum	Projection {   ThreeD, RPhi, Z, ThreeD,   RPhi, Z }
	Projection Type.
enum	Projection {   ThreeD, RPhi, Z, ThreeD,   RPhi, Z }
	Projection Type.

Functions
template<class charT , class traits >
std::basic_ostream< charT, traits > &	operator<< (std::basic_ostream< charT, traits > &os, const HelixRep &H)
double	determinant (Matrix3x3 input)
SymMatrix5x5	InvertMatrix5x5 (SymMatrix5x5 input)
Matrix3x3	InvertMatrix (Matrix3x3 input)
Matrix2x2	InvertMatrix2 (Matrix2x2 input)
string	makeString (const double param)
string	makeString (const void *param)
string	makeString (const bool param)
string	makeString (const string param)
double	gamSer (double a, double x)
	Incomplete gamma function P(a,x) via its series representation.
double	gamCf (double a, double x)
	Computation of the incomplete gamma function P(a,x) via its continued fraction representation.
double	gamma (double a, double x)
	Computation of the upper incomplete gamma function P(a,x)
double	lnGamma (double z)
	Computation of ln[gamma(z)] for all z>0. More...
double	prob (double ChiSquared, double DegreesOfFreedom)
	Calculate probability from Chi Squared and Degrees of freedom.

Detailed Description

Utility classes for the vertex package.

Function Documentation

double vertex_lcfi::util::lnGamma

(

double

z

)

Computation of ln[gamma(z)] for all z>0.

The algorithm is based on the article by C.Lanczos [1] as denoted in Numerical Recipes 2nd ed. on p. 207 (W.H.Press et al.). [1] C.Lanczos, SIAM Journal of Numerical Analysis B1 (1964), 86. The accuracy of the result is better than 2e-10.

Definition at line 68 of file util.cpp.

Referenced by gamCf(), and gamSer().