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 ()
virtual TClass *	IsA () const
virtual void	Streamer (TBuffer &)
void	StreamerNVirtual (TBuffer &ClassDef_StreamerNVirtual_b)

Static Public Member Functions
static TClass *	Class ()
static const char *	Class_Name ()
static constexpr Version_t	Class_Version ()
static const char *	DeclFileName ()
static double	gaussian (TRandom *generator=randomGenerator())
	Return a Gaussian random variable with mean 0 and variance 1.
static UInt_t	integer (UInt_t max, TRandom *generator=randomGenerator())
	Return an integer uniformly distributed from [0,n-1].
static bool	quasi (UInt_t dimension, double 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.
static RooQuasiRandomGenerator *	quasiGenerator ()
	Return a pointer to a singleton quasi-random generator implementation.
static TRandom *	randomGenerator ()
	Return a pointer to a singleton random-number generator implementation.
static void	setRandomGenerator (TRandom *gen)
	set the random number generator; takes ownership of the object passed as parameter
static double	uniform (TRandom *generator=randomGenerator())
	Return a number uniformly distributed from (0,1)
static void	uniform (UInt_t dimension, double vector[], TRandom *generator=randomGenerator())
	Fill the vector provided with random numbers uniformly distributed from (0,1)

Private Member Functions
	RooRandom ()

Static Private Attributes
static TRandom *	_theGenerator = nullptr
	random number generator
static RooQuasiRandomGenerator *	_theQuasiGenerator = nullptr
	quasi random number sequence generator
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

Class()

static TClass * RooRandom::Class ( )

static

Returns

TClass describing this class

Class_Name()

static const char * RooRandom::Class_Name ( )

static

Returns

Name of this class

Class_Version()

static constexpr Version_t RooRandom::Class_Version ( )

inlinestaticconstexpr

Returns

Version of this class

Definition at line 51 of file RooRandom.h.

DeclFileName()

static const char * RooRandom::DeclFileName ( )

inlinestatic

Returns

Name of the file containing the class declaration

Definition at line 51 of file RooRandom.h.

gaussian()

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

static

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

Definition at line 105 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 96 of file RooRandom.cxx.

IsA()

virtual TClass * RooRandom::IsA ( ) const

inlinevirtual

Returns

TClass describing current object

Definition at line 51 of file RooRandom.h.

quasi()

bool RooRandom::quasi ( UInt_t  dimension, double  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 116 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 68 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 48 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 58 of file RooRandom.cxx.

Streamer()

virtual void RooRandom::Streamer ( TBuffer &  )

virtual

StreamerNVirtual()

void RooRandom::StreamerNVirtual ( TBuffer &  ClassDef_StreamerNVirtual_b )

inline

Definition at line 51 of file RooRandom.h.

uniform() [1/2]

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

static

Return a number uniformly distributed from (0,1)

Definition at line 78 of file RooRandom.cxx.

uniform() [2/2]

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

static

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

Definition at line 87 of file RooRandom.cxx.

Friends And Related Symbol Documentation

RooRandom::Guard

friend struct RooRandom::Guard

friend

Definition at line 49 of file RooRandom.h.

Member Data Documentation

_theGenerator

TRandom * RooRandom::_theGenerator = nullptr

staticprivate

random number generator

Definition at line 43 of file RooRandom.h.

_theQuasiGenerator

RooQuasiRandomGenerator * RooRandom::_theQuasiGenerator = nullptr

staticprivate

quasi random number sequence generator

Definition at line 44 of file RooRandom.h.

guard

RooRandom::Guard RooRandom::guard

staticprivate

Definition at line 48 of file RooRandom.h.

Libraries for RooRandom:

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

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