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 (RandomEngineAndDistribution const *random) const
	Random generator. More...
double	gamma_exp (RandomEngineAndDistribution const *random) const
double	gamma_lin (RandomEngineAndDistribution const *random) const
	GammaNumericalGenerator (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 (double xmin=0., double xmax=1., int n=1000, int iter=6)
double	generate (RandomEngineAndDistribution const *) const
	The random generation according to function() More...
double	generateExp (RandomEngineAndDistribution const *) const
double	generateLin (RandomEngineAndDistribution const *) 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
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 ( 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(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 29 of file GammaNumericalGenerator.h.

{}

Member Function Documentation

double GammaNumericalGenerator::ersatzt ( double  x )

inlineprivate

Gamma Function.

Definition at line 46 of file GammaNumericalGenerator.h.

References a_, b_, JetChargeProducer_cfi::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 39 of file GammaNumericalGenerator.h.

References ersatzt(), and x.

{ return ersatzt(x); }

double GammaNumericalGenerator::gamma ( RandomEngineAndDistribution const *  random ) const

inline

Random generator.

Definition at line 32 of file GammaNumericalGenerator.h.

References BaseNumericalRandomGenerator::generate().

{ return generate(random); }

double GammaNumericalGenerator::gamma_exp ( RandomEngineAndDistribution const *  random ) const

inline

Definition at line 34 of file GammaNumericalGenerator.h.

References BaseNumericalRandomGenerator::generateExp().

{return generateExp(random);}

double GammaNumericalGenerator::gamma_lin ( RandomEngineAndDistribution const *  random ) const

inline

Definition at line 36 of file GammaNumericalGenerator.h.

References BaseNumericalRandomGenerator::generateLin().

{return generateLin(random);}

bool GammaNumericalGenerator::isValid ( void  ) const

inline

Definition at line 41 of file GammaNumericalGenerator.h.

References valid.

Referenced by ntupleDataFormat._Object::_checkIsValid(), and core.AutoHandle.AutoHandle::ReallyLoad().

{return valid;}

Member Data Documentation

double GammaNumericalGenerator::a_

private

Definition at line 52 of file GammaNumericalGenerator.h.

Referenced by ersatzt().

double GammaNumericalGenerator::b_

private

Definition at line 52 of file GammaNumericalGenerator.h.

Referenced by ersatzt().

bool GammaNumericalGenerator::valid

private

Definition at line 53 of file GammaNumericalGenerator.h.

Referenced by GammaNumericalGenerator(), and isValid().