library: libCore
#include "TRandom3.h"

TRandom3

class description - header file - source file - inheritance tree (.pdf)

class TRandom3 : public TRandom

Inheritance Chart:

TObject

TNamed

TRandom

TRandom3


    public:

                       TRandom3(UInt_t seed = 4357)
                       TRandom3(const TRandom3&)
               virtual ~TRandom3()
        static TClass* Class()
       virtual TClass* IsA() const
             TRandom3& operator=(const TRandom3&)
      virtual Double_t Rndm(Int_t i = 0)
          virtual void RndmArray(Int_t n, Float_t* array)
          virtual void RndmArray(Int_t n, Double_t* array)
          virtual void SetSeed(UInt_t seed = 0)
          virtual void ShowMembers(TMemberInspector& insp, char* parent)
          virtual void Streamer(TBuffer& b)
                  void StreamerNVirtual(TBuffer& b)

Data Members

    private:

      UInt_t fMt[624]   
       Int_t fCount624

Class Description


 TRandom3

 Random number generator class based on
   M. Matsumoto and T. Nishimura,
   Mersenne Twistor: 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 Twistor homepage
   http://www.math.keio.ac.jp/~matumoto/emt.html

 Advantage: large period 2**19937-1
            relativly fast
              (only two times slower than TRandom, but
               two times faster than TRandom2)
 Drawback:  a relative large internal state of 624 integers


 Aug.99 ROOT implementation based on CLHEP by P.Malzacher

 the original code contains the following copyright notice:
 This library is free software; you can redistribute it and/or

TRandom3(UInt_t seed)

*-*-*-*-*-*-*-*-*-*-*default constructor*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
 If seed is 0, the seed is automatically computed via a TUUID object.
 In this case the seed is guaranteed to be unique in space and time.

~TRandom3()

*-*-*-*-*-*-*-*-*-*-*default destructor*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
*-*                  ==================

Double_t Rndm(Int_t)

  Machine independent random number generator.
  Produces uniformly-distributed floating points in ]0,1]
  Method: Mersenne Twistor

void RndmArray(Int_t n, Float_t *array)

 Return an array of n random numbers uniformly distributed in ]0,1]

void RndmArray(Int_t n, Double_t *array)

 Return an array of n random numbers uniformly distributed in ]0,1]

void SetSeed(UInt_t seed)

  Set the random generator sequence
 if seed is 0 (default value) a TUUID is generated and used to fill
 the first 8 integers of the seed array.
 In this case the seed is guaranteed to be unique in space and time.
 Use upgraded seeding procedure to fix a known problem when seeding with values
 with many zero in the bit pattern (like 2**28).
 see http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/MT2002/emt19937ar.html

void Streamer(TBuffer &R__b)

 Stream an object of class TRandom3.

TRandom3(UInt_t seed=4357)

Author: Peter Malzacher 31/08/99
Last update: root/base:$Name: $:$Id: TRandom3.cxx,v 1.14 2006/06/16 13:05:33 brun Exp $

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