RooRandom Class Reference

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 Double_t	gaussian (TRandom *generator=randomGenerator())
	Return a Gaussian random variable with mean 0 and variance 1. More...
static UInt_t	integer (UInt_t max, TRandom *generator=randomGenerator())
	Return an integer uniformly distributed from [0,n-1]. 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...
static RooQuasiRandomGenerator *	quasiGenerator ()
	Return a pointer to a singleton quasi-random generator implementation. More...
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...

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

~RooRandom()

virtual RooRandom::~RooRandom ( )

inlinevirtual

Definition at line 27 of file RooRandom.h.

RooRandom()

RooRandom::RooRandom ( )

private

Member Function Documentation

gaussian()

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.

integer()

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.

quasi()

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.

quasiGenerator()

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.

randomGenerator()

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.

setRandomGenerator()

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.

uniform() [1/2]

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

static

Return a number uniformly distributed from (0,1)

Definition at line 84 of file RooRandom.cxx.

uniform() [2/2]

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

RooRandom::Guard

friend struct RooRandom::Guard

friend

Definition at line 49 of file RooRandom.h.

Member Data Documentation

_theGenerator

TRandom * RooRandom::_theGenerator = 0

staticprivate

Definition at line 43 of file RooRandom.h.

_theQuasiGenerator

RooQuasiRandomGenerator * RooRandom::_theQuasiGenerator = 0

staticprivate

Definition at line 44 of file RooRandom.h.

guard

RooRandom::Guard RooRandom::guard

staticprivate

Definition at line 48 of file RooRandom.h.

---

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

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