This class provides a static interface for generating random numbers.

By default a private copy of TRandom3 is used to generate all random numbers.

Definition at line 24 of file RooRandom.h.

Classes
struct	Guard

Public Member Functions
virtual	~RooRandom ()

Static Public Member Functions
static TRandom *	randomGenerator ()
	Return a pointer to a singleton random-number generator implementation. More...

static void	setRandomGenerator (TRandom *gen)
	set the random number generator; takes ownership of the object passed as parameter More...

static Double_t	uniform (TRandom *generator=randomGenerator())
	Return a number uniformly distributed from (0,1) More...

static void	uniform (UInt_t dimension, Double_t vector[], TRandom *generator=randomGenerator())
	Fill the vector provided with random numbers uniformly distributed from (0,1) More...

static UInt_t	integer (UInt_t max, TRandom *generator=randomGenerator())
	Return an integer uniformly distributed from [0,n-1]. More...

static Double_t	gaussian (TRandom *generator=randomGenerator())
	Return a Gaussian random variable with mean 0 and variance 1. More...

static RooQuasiRandomGenerator *	quasiGenerator ()
	Return a pointer to a singleton quasi-random generator implementation. More...

static Bool_t	quasi (UInt_t dimension, Double_t vector[], RooQuasiRandomGenerator *generator=quasiGenerator())
	Return a quasi-random number in the range (0,1) using the Niederreiter base 2 generator described in Bratley, Fox, Niederreiter, ACM Trans. More...

Private Member Functions
	RooRandom ()

Static Private Attributes
static TRandom *	_theGenerator = 0

static RooQuasiRandomGenerator *	_theQuasiGenerator = 0

static struct Guard	guard

Friends
struct	RooRandom::Guard

#include <RooRandom.h>

Constructor & Destructor Documentation

virtual RooRandom::~RooRandom ( )

inlinevirtual

Definition at line 27 of file RooRandom.h.

RooRandom::RooRandom ( )

private

Member Function Documentation

Double_t RooRandom::gaussian ( TRandom * generator = randomGenerator() )

static

Return a Gaussian random variable with mean 0 and variance 1.

Definition at line 111 of file RooRandom.cxx.

Referenced by ClassImp(), RooMultiVarGaussian::generateEvent(), and RooFitResult::randomizePars().

UInt_t RooRandom::integer	(	UInt_t	max,
		TRandom *	generator = `randomGenerator()`
	)

static

Return an integer uniformly distributed from [0,n-1].

Definition at line 102 of file RooRandom.cxx.

Referenced by RooStats::HypoTestCalculatorGeneric::GetHypoTest(), RooAbsCategoryLValue::randomize(), RooAbsPdf::randomizeProtoOrder(), and RooStats::HypoTestCalculatorGeneric::UseSameAltToys().

Bool_t RooRandom::quasi	(	UInt_t	dimension,
		Double_t	vector[],
		RooQuasiRandomGenerator *	generator = `quasiGenerator()`
	)

static

Return a quasi-random number in the range (0,1) using the Niederreiter base 2 generator described in Bratley, Fox, Niederreiter, ACM Trans.

Model. Comp. Sim. 2, 195 (1992).

Definition at line 122 of file RooRandom.cxx.

Referenced by RooGrid::generatePoint().

RooQuasiRandomGenerator * RooRandom::quasiGenerator ( )

static

Return a pointer to a singleton quasi-random generator implementation.

Creates the object the first time it is called.

Definition at line 74 of file RooRandom.cxx.

TRandom * RooRandom::randomGenerator ( )

static

Return a pointer to a singleton random-number generator implementation.

Creates the object the first time it is called.

Definition at line 54 of file RooRandom.cxx.

Referenced by ClassImp(), RooStats::ToyMCStudy::execute(), FourBinInstructional(), RooAbsGenContext::generate(), RooBinnedGenContext::generate(), RooAbsPdf::generateBinned(), RooPoisson::generateEvent(), RooLognormal::generateEvent(), RooLandau::generateEvent(), RooGamma::generateEvent(), RooGaussian::generateEvent(), RooGaussModel::generateEvent(), RooGExpModel::generateEvent(), RooStats::HypoTestCalculatorGeneric::GetHypoTest(), HybridOriginalDemo(), RooStats::ToyMCStudy::initialize(), RooStudyPackage::initRandom(), IntervalExamples(), RooRandomizeParamMCSModule::processBeforeGen(), RooFoamGenerator::RooFoamGenerator(), rs401d_FeldmanCousins(), RooMCStudy::run(), and RooUnitTest::runTest().

void RooRandom::setRandomGenerator ( TRandom * gen )

static

set the random number generator; takes ownership of the object passed as parameter

Definition at line 64 of file RooRandom.cxx.

Double_t RooRandom::uniform ( TRandom * generator = randomGenerator() )

static

Return a number uniformly distributed from (0,1)

Definition at line 84 of file RooRandom.cxx.

void RooRandom::uniform	(	UInt_t	dimension,
		Double_t	vector[],
		TRandom *	generator = `randomGenerator()`
	)

static

Fill the vector provided with random numbers uniformly distributed from (0,1)

Definition at line 93 of file RooRandom.cxx.

Friends And Related Function Documentation

friend struct RooRandom::Guard

friend

Definition at line 49 of file RooRandom.h.

Member Data Documentation

TRandom * RooRandom::_theGenerator = 0

staticprivate

Definition at line 43 of file RooRandom.h.

Referenced by RooRandom::Guard::~Guard().

RooQuasiRandomGenerator * RooRandom::_theQuasiGenerator = 0

staticprivate

Definition at line 44 of file RooRandom.h.

Referenced by RooRandom::Guard::~Guard().

RooRandom::Guard RooRandom::guard

staticprivate

Definition at line 48 of file RooRandom.h.

Collaboration diagram for RooRandom:

[legend]

The documentation for this class was generated from the following files:

roofit/roofitcore/inc/RooRandom.h
roofit/roofitcore/src/RooRandom.cxx

Classes

Public Member Functions

Static Public Member Functions

Private Member Functions

Static Private Attributes

Friends

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation