ROOT::Math::MersenneTwisterEngine Class Reference

Random number generator class based on M.

Matsumoto and T. Nishimura, Mersenne Twister: A 623-diminsionally equidistributed uniform pseudorandom number generator ACM Transactions on Modeling and Computer Simulation, Vol. 8, No. 1, January 1998, pp 3–30.

For more information see the Mersenne Twister homepage [http://www.math.keio.ac.jp/~matumoto/emt.html]

Advantage:

• large period 2**19937 -1
• relativly fast (slightly slower than TRandom1 and TRandom2 but much faster than TRandom1)

Drawback: a relative large internal state of 624 integers

Definition at line 47 of file MersenneTwisterEngine.h.

Public Types
typedef TRandomEngine	BaseType

Public Member Functions
	MersenneTwisterEngine (unsigned int seed=4357)
virtual	~MersenneTwisterEngine ()
void	SetSeed (unsigned int seed)
	set the seed x More...
virtual double	Rndm ()
double	operator() ()
unsigned int	IntRndm ()
Public Member Functions inherited from ROOT::Math::TRandomEngine
virtual	~TRandomEngine ()
Public Member Functions inherited from ROOT::Math::RandomBaseEngine
virtual	~RandomBaseEngine ()

Private Member Functions
double	Rndm_impl ()
	generate a random double number More...

Private Attributes
uint32_t	fMt [624]
int	fCount624

#include <Math/MersenneTwisterEngine.h>

Inheritance diagram for ROOT::Math::MersenneTwisterEngine:

Member Typedef Documentation

typedef TRandomEngine ROOT::Math::MersenneTwisterEngine::BaseType

Definition at line 52 of file MersenneTwisterEngine.h.

Constructor & Destructor Documentation

ROOT::Math::MersenneTwisterEngine::MersenneTwisterEngine ( unsigned int  seed = 4357 )

inline

Definition at line 54 of file MersenneTwisterEngine.h.

virtual ROOT::Math::MersenneTwisterEngine::~MersenneTwisterEngine ( )

inlinevirtual

Definition at line 58 of file MersenneTwisterEngine.h.

Member Function Documentation

unsigned int ROOT::Math::MersenneTwisterEngine::IntRndm ( )

inline

Definition at line 68 of file MersenneTwisterEngine.h.

double ROOT::Math::MersenneTwisterEngine::operator() ( )

inline

Definition at line 66 of file MersenneTwisterEngine.h.

virtual double ROOT::Math::MersenneTwisterEngine::Rndm ( )

inlinevirtual

Implements ROOT::Math::RandomBaseEngine.

Definition at line 63 of file MersenneTwisterEngine.h.

double ROOT::Math::MersenneTwisterEngine::Rndm_impl ( )

private

generate a random double number

Definition at line 37 of file MersenneTwisterEngine.cxx.

Referenced by IntRndm(), operator()(), Rndm(), and Rndm_impl().

void ROOT::Math::MersenneTwisterEngine::SetSeed

(

unsigned int

seed

)

set the seed x

Definition at line 24 of file MersenneTwisterEngine.cxx.

Referenced by MersenneTwisterEngine().

Member Data Documentation

int ROOT::Math::MersenneTwisterEngine::fCount624

private

Definition at line 80 of file MersenneTwisterEngine.h.

Referenced by Rndm_impl(), and SetSeed().

uint32_t ROOT::Math::MersenneTwisterEngine::fMt[624]

private

Definition at line 79 of file MersenneTwisterEngine.h.

Referenced by Rndm_impl(), and SetSeed().

Collaboration diagram for ROOT::Math::MersenneTwisterEngine:

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

• math/mathcore/inc/Math/MersenneTwisterEngine.h
• math/mathcore/src/MersenneTwisterEngine.cxx