GammaNumericalGenerator Class Reference

#include <GammaNumericalGenerator.h>

Inheritance diagram for GammaNumericalGenerator:

Public Member Functions
double	function (double x) override
	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
	~GammaNumericalGenerator () override
	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 15 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();
    }
  }

GammaNumericalGenerator::~GammaNumericalGenerator ( )

inlineoverride

Default destructor.

Definition at line 24 of file GammaNumericalGenerator.h.

{}

Member Function Documentation

double GammaNumericalGenerator::ersatzt ( double  x )

inlineprivate

Gamma Function.

Definition at line 40 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);
  }

double GammaNumericalGenerator::function ( double  x )

inlineoverridevirtual

The probability density function implementation.

Implements BaseNumericalRandomGenerator.

Definition at line 34 of file GammaNumericalGenerator.h.

References ersatzt(), and x.

{ return ersatzt(x); }

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

inline

Random generator.

Definition at line 27 of file GammaNumericalGenerator.h.

References BaseNumericalRandomGenerator::generate().

{ return generate(random); }

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

inline

Definition at line 29 of file GammaNumericalGenerator.h.

References BaseNumericalRandomGenerator::generateExp().

{ return generateExp(random); }

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

inline

Definition at line 31 of file GammaNumericalGenerator.h.

References BaseNumericalRandomGenerator::generateLin().

{ return generateLin(random); }

bool GammaNumericalGenerator::isValid ( void  ) const

inline

Definition at line 36 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 46 of file GammaNumericalGenerator.h.

Referenced by ersatzt().

double GammaNumericalGenerator::b_

private

Definition at line 46 of file GammaNumericalGenerator.h.

Referenced by ersatzt().

bool GammaNumericalGenerator::valid

private

Definition at line 47 of file GammaNumericalGenerator.h.

Referenced by GammaNumericalGenerator(), and isValid().