Reference Manual

CMS 3D

#include <LandauFluctuationGenerator.h>

Inheritance diagram for LandauFluctuationGenerator:

Public Member Functions
double	function (double x) override
	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...

	~LandauFluctuationGenerator () 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)
	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 23 of file LandauFluctuationGenerator.h.

References BaseNumericalRandomGenerator::initialize().

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

BaseNumericalRandomGenerator::BaseNumericalRandomGenerator

BaseNumericalRandomGenerator(double xmin=0., double xmax=1., int n=1000, int iter=6)

Definition: BaseNumericalRandomGenerator.cc:7

BaseNumericalRandomGenerator::initialize

void initialize()

The initialization (numerical integarion, inversion)

Definition: BaseNumericalRandomGenerator.cc:13

LandauFluctuationGenerator::~LandauFluctuationGenerator ( )

inlineoverride

Default destructor.

Definition at line 26 of file LandauFluctuationGenerator.h.

26 {}

Member Function Documentation

double LandauFluctuationGenerator::ersatzt ( double x )

inlineprivate

Ersatzt for Landau Fluctuations (very good approximation)

Definition at line 36 of file LandauFluctuationGenerator.h.

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

Referenced by function().

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

T sqrt(T t)

Definition: SSEVec.h:19

#define M_PI

Definition: BXVectorInputProducer.cc:50

JetChargeProducer_cfi.exp

exp

Definition: JetChargeProducer_cfi.py:6

double LandauFluctuationGenerator::function ( double x )

inlineoverridevirtual

The probability density function implementation.

Implements BaseNumericalRandomGenerator.

Definition at line 32 of file LandauFluctuationGenerator.h.

References ersatzt(), and x.

32 { return ersatzt(x); }

LandauFluctuationGenerator::ersatzt

double ersatzt(double x)

Ersatzt for Landau Fluctuations (very good approximation)

Definition: LandauFluctuationGenerator.h:36

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

inline

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

Definition at line 29 of file LandauFluctuationGenerator.h.

References BaseNumericalRandomGenerator::generate().

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

29 { return generate(random); }

BaseNumericalRandomGenerator::generate

double generate(RandomEngineAndDistribution const *) const

The random generation according to function()

Definition: BaseNumericalRandomGenerator.cc:75