LandauFluctuationGenerator Class Reference

#include <LandauFluctuationGenerator.h>

Inheritance diagram for LandauFluctuationGenerator:

Public Member Functions
virtual double	function (double x)
	The probability density function implementation. More...
double	landau (RandomEngineAndDistribution const *random) const
	Random generator of the dE/dX spread (Landau function) More...
	LandauFluctuationGenerator ()
	Constructor : initialization of the Random Generator. More...
virtual	~LandauFluctuationGenerator ()
	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)
	Ersatzt for Landau Fluctuations (very good approximation) More...

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 20 of file LandauFluctuationGenerator.h.

Constructor & Destructor Documentation

LandauFluctuationGenerator::LandauFluctuationGenerator ( )

inline

Constructor : initialization of the Random Generator.

Definition at line 25 of file LandauFluctuationGenerator.h.

References BaseNumericalRandomGenerator::initialize().

                               :
    BaseNumericalRandomGenerator(-3.5,25.) {
    initialize();
  }

virtual LandauFluctuationGenerator::~LandauFluctuationGenerator ( )

inlinevirtual

Default destructor.

Definition at line 31 of file LandauFluctuationGenerator.h.

{}

Member Function Documentation

double LandauFluctuationGenerator::ersatzt ( double  x )

inlineprivate

Ersatzt for Landau Fluctuations (very good approximation)

Definition at line 42 of file LandauFluctuationGenerator.h.

References JetChargeProducer_cfi::exp, M_PI, and mathSSE::sqrt().

Referenced by function().

                           { 
    return  std::exp(-0.5 * ( x + std::exp(-x) )) / std::sqrt (2. *M_PI); 
  }

virtual double LandauFluctuationGenerator::function ( double  x )

inlinevirtual

The probability density function implementation.

Implements BaseNumericalRandomGenerator.

Definition at line 37 of file LandauFluctuationGenerator.h.

References ersatzt(), and x.

{ return ersatzt(x); }

double LandauFluctuationGenerator::landau ( RandomEngineAndDistribution const *  random ) const

inline

Random generator of the dE/dX spread (Landau function)

Definition at line 34 of file LandauFluctuationGenerator.h.

References BaseNumericalRandomGenerator::generate().

Referenced by PreshowerHitMaker::addHit(), and EnergyLossSimulator::compute().

{ return generate(random); }