GammaNumericalGenerator Class Reference

#include <GammaNumericalGenerator.h>

Inheritance diagram for GammaNumericalGenerator:

Public Member Functions
virtual double	function (double x)
	The probability density function implementation. More...
double	gamma () const
	Random generator. More...
double	gamma_exp () const
double	gamma_lin () const
	GammaNumericalGenerator (const RandomEngine *engine, double a=0, double b=0, double x1=0, double x2=0)
	Constructor : initialization of the Random Generator. More...
bool	isValid () const
virtual	~GammaNumericalGenerator ()
	Default destructor. More...
Public Member Functions inherited from BaseNumericalRandomGenerator
	BaseNumericalRandomGenerator (const RandomEngine *engine, double xmin=0., double xmax=1., int n=1000, int iter=6)
double	generate () const
	The random generation according to function() More...
double	generateExp () const
double	generateLin () const
void	initialize ()
	The initialization (numerical integarion, inversion) More...
bool	setSubInterval (double x1, double x2)
	To shoot in a given interval. More...
virtual	~BaseNumericalRandomGenerator ()
	Default destructor. More...

Private Member Functions
double	ersatzt (double x)
	Gamma Function. More...

Private Attributes
double	a_
double	b_
bool	valid

Additional Inherited Members
Protected Attributes inherited from BaseNumericalRandomGenerator
double	deltar
std::vector< double >	f
int	iter
int	n
const RandomEngine *	random
double	rmin
std::vector< double >	sampling
double	xmax
double	xmin

Detailed Description

Definition at line 12 of file GammaNumericalGenerator.h.

Constructor & Destructor Documentation

GammaNumericalGenerator::GammaNumericalGenerator ( const RandomEngine *  engine, double  a = 0, double  b = 0, double  x1 = 0, double  x2 = 0  )

inline

Constructor : initialization of the Random Generator.

Definition at line 17 of file GammaNumericalGenerator.h.

References a, b, BaseNumericalRandomGenerator::initialize(), and valid.

                                                              : 
     BaseNumericalRandomGenerator(engine,x1,x2,1000),
     a_(a),b_(b),valid(false) {

    if(a>0&&b>0) 
      {
    valid=true;
    initialize();
      }
  }

virtual GammaNumericalGenerator::~GammaNumericalGenerator ( )

inlinevirtual

Default destructor.

Definition at line 30 of file GammaNumericalGenerator.h.

{}

Member Function Documentation

double GammaNumericalGenerator::ersatzt ( double  x )

inlineprivate

Gamma Function.

Definition at line 47 of file GammaNumericalGenerator.h.

References a_, b_, create_public_lumi_plots::exp, funct::pow(), and x.

Referenced by function().

                           { 
    double bt=b_*x;
    return  b_*pow(bt,a_-1)*exp(-bt);
  }

virtual double GammaNumericalGenerator::function ( double  x )

inlinevirtual

The probability density function implementation.

Implements BaseNumericalRandomGenerator.

Definition at line 40 of file GammaNumericalGenerator.h.

References ersatzt(), and x.

{ return ersatzt(x); }

double GammaNumericalGenerator::gamma ( ) const

inline

Random generator.

Definition at line 33 of file GammaNumericalGenerator.h.

References BaseNumericalRandomGenerator::generate().

{ return generate(); }

double GammaNumericalGenerator::gamma_exp ( ) const

inline

Definition at line 35 of file GammaNumericalGenerator.h.

References BaseNumericalRandomGenerator::generateExp().

{return generateExp();}

double GammaNumericalGenerator::gamma_lin ( ) const

inline

Definition at line 37 of file GammaNumericalGenerator.h.

References BaseNumericalRandomGenerator::generateLin().

{return generateLin();}

bool GammaNumericalGenerator::isValid ( void  ) const

inline

Definition at line 42 of file GammaNumericalGenerator.h.

References valid.

{return valid;}

Member Data Documentation

double GammaNumericalGenerator::a_

private

Definition at line 53 of file GammaNumericalGenerator.h.

Referenced by ersatzt().

double GammaNumericalGenerator::b_

private

Definition at line 53 of file GammaNumericalGenerator.h.

Referenced by ersatzt().

bool GammaNumericalGenerator::valid

private

Definition at line 54 of file GammaNumericalGenerator.h.

Referenced by GammaNumericalGenerator(), and isValid().