ROOT  6.06/09
Reference Guide
Public Member Functions | Private Attributes | List of all members
TRandom3 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:

Drawback: a relative large internal state of 624 integers

Definition at line 29 of file TRandom3.h.

Public Member Functions

 TRandom3 (UInt_t seed=4357)
 
virtual ~TRandom3 ()
 *-*-*-*-*-*-*-*-*-*-*default destructor*-*-*-*-*-*-*-*-*-*-*-*-*-*-* *-* ================== More...
 
virtual UInt_t GetSeed () const
 
virtual Double_t Rndm (Int_t i=0)
 Machine independent random number generator. More...
 
virtual void RndmArray (Int_t n, Float_t *array)
 Return an array of n random numbers uniformly distributed in ]0,1]. More...
 
virtual void RndmArray (Int_t n, Double_t *array)
 Return an array of n random numbers uniformly distributed in ]0,1]. More...
 
virtual void SetSeed (UInt_t seed=0)
 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. More...
 
- Public Member Functions inherited from TRandom
 TRandom (UInt_t seed=65539)
 
virtual ~TRandom ()
 Default destructor. More...
 
virtual Int_t Binomial (Int_t ntot, Double_t prob)
 Generates a random integer N according to the binomial law. More...
 
virtual Double_t BreitWigner (Double_t mean=0, Double_t gamma=1)
 Return a number distributed following a BreitWigner function with mean and gamma. More...
 
virtual void Circle (Double_t &x, Double_t &y, Double_t r)
 Generates random vectors, uniformly distributed over a circle of given radius. More...
 
virtual Double_t Exp (Double_t tau)
 Returns an exponential deviate. More...
 
virtual Double_t Gaus (Double_t mean=0, Double_t sigma=1)
 Samples a random number from the standard Normal (Gaussian) Distribution with the given mean and sigma. More...
 
virtual UInt_t Integer (UInt_t imax)
 Returns a random integer on [ 0, imax-1 ]. More...
 
virtual Double_t Landau (Double_t mean=0, Double_t sigma=1)
 Generate a random number following a Landau distribution with location parameter mu and scale parameter sigma: Landau( (x-mu)/sigma ) Note that mu is not the mpv(most probable value) of the Landa distribution and sigma is not the standard deviation of the distribution which is not defined. More...
 
virtual Int_t Poisson (Double_t mean)
 Generates a random integer N according to a Poisson law. More...
 
virtual Double_t PoissonD (Double_t mean)
 Generates a random number according to a Poisson law. More...
 
virtual void Rannor (Float_t &a, Float_t &b)
 Return 2 numbers distributed following a gaussian with mean=0 and sigma=1. More...
 
virtual void Rannor (Double_t &a, Double_t &b)
 Return 2 numbers distributed following a gaussian with mean=0 and sigma=1. More...
 
virtual void ReadRandom (const char *filename)
 Reads saved random generator status from filename. More...
 
virtual void Sphere (Double_t &x, Double_t &y, Double_t &z, Double_t r)
 Generates random vectors, uniformly distributed over the surface of a sphere of given radius. More...
 
virtual Double_t Uniform (Double_t x1=1)
 Returns a uniform deviate on the interval (0, x1). More...
 
virtual Double_t Uniform (Double_t x1, Double_t x2)
 Returns a uniform deviate on the interval (x1, x2). More...
 
virtual void WriteRandom (const char *filename) const
 Writes random generator status to filename. More...
 
- Public Member Functions inherited from TNamed
 TNamed ()
 
 TNamed (const char *name, const char *title)
 
 TNamed (const TString &name, const TString &title)
 
 TNamed (const TNamed &named)
 
TNamedoperator= (const TNamed &rhs)
 TNamed assignment operator. More...
 
virtual ~TNamed ()
 
virtual void Clear (Option_t *option="")
 Set name and title to empty strings (""). More...
 
virtual TObjectClone (const char *newname="") const
 Make a clone of an object using the Streamer facility. More...
 
virtual Int_t Compare (const TObject *obj) const
 Compare two TNamed objects. More...
 
virtual void Copy (TObject &named) const
 Copy this to obj. More...
 
virtual void FillBuffer (char *&buffer)
 Encode TNamed into output buffer. More...
 
virtual const char * GetName () const
 Returns name of object. More...
 
virtual const char * GetTitle () const
 Returns title of object. More...
 
virtual ULong_t Hash () const
 Return hash value for this object. More...
 
virtual Bool_t IsSortable () const
 
virtual void SetName (const char *name)
 Change (i.e. More...
 
virtual void SetNameTitle (const char *name, const char *title)
 Change (i.e. set) all the TNamed parameters (name and title). More...
 
virtual void SetTitle (const char *title="")
 Change (i.e. set) the title of the TNamed. More...
 
virtual void ls (Option_t *option="") const
 List TNamed name and title. More...
 
virtual void Print (Option_t *option="") const
 Print TNamed name and title. More...
 
virtual Int_t Sizeof () const
 Return size of the TNamed part of the TObject. More...
 
- Public Member Functions inherited from TObject
 TObject ()
 
 TObject (const TObject &object)
 TObject copy ctor. More...
 
TObjectoperator= (const TObject &rhs)
 TObject assignment operator. More...
 
virtual ~TObject ()
 TObject destructor. More...
 
virtual void AppendPad (Option_t *option="")
 Append graphics object to current pad. More...
 
virtual void Browse (TBrowser *b)
 Browse object. May be overridden for another default action. More...
 
virtual const char * ClassName () const
 Returns name of class to which the object belongs. More...
 
virtual void Delete (Option_t *option="")
 Delete this object. More...
 
virtual Int_t DistancetoPrimitive (Int_t px, Int_t py)
 Computes distance from point (px,py) to the object. More...
 
virtual void Draw (Option_t *option="")
 Default Draw method for all objects. More...
 
virtual void DrawClass () const
 Draw class inheritance tree of the class to which this object belongs. More...
 
virtual TObjectDrawClone (Option_t *option="") const
 Draw a clone of this object in the current pad. More...
 
virtual void Dump () const
 Dump contents of object on stdout. More...
 
virtual void Execute (const char *method, const char *params, Int_t *error=0)
 Execute method on this object with the given parameter string, e.g. More...
 
virtual void Execute (TMethod *method, TObjArray *params, Int_t *error=0)
 Execute method on this object with parameters stored in the TObjArray. More...
 
virtual void ExecuteEvent (Int_t event, Int_t px, Int_t py)
 Execute action corresponding to an event at (px,py). More...
 
virtual TObjectFindObject (const char *name) const
 Must be redefined in derived classes. More...
 
virtual TObjectFindObject (const TObject *obj) const
 Must be redefined in derived classes. More...
 
virtual Option_tGetDrawOption () const
 Get option used by the graphics system to draw this object. More...
 
virtual UInt_t GetUniqueID () const
 Return the unique object id. More...
 
virtual const char * GetIconName () const
 Returns mime type name of object. More...
 
virtual Option_tGetOption () const
 
virtual char * GetObjectInfo (Int_t px, Int_t py) const
 Returns string containing info about the object at position (px,py). More...
 
virtual Bool_t HandleTimer (TTimer *timer)
 Execute action in response of a timer timing out. More...
 
virtual Bool_t InheritsFrom (const char *classname) const
 Returns kTRUE if object inherits from class "classname". More...
 
virtual Bool_t InheritsFrom (const TClass *cl) const
 Returns kTRUE if object inherits from TClass cl. More...
 
virtual void Inspect () const
 Dump contents of this object in a graphics canvas. More...
 
virtual Bool_t IsFolder () const
 Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More...
 
virtual Bool_t IsEqual (const TObject *obj) const
 Default equal comparison (objects are equal if they have the same address in memory). More...
 
Bool_t IsOnHeap () const
 
Bool_t IsZombie () const
 
virtual Bool_t Notify ()
 This method must be overridden to handle object notification. More...
 
virtual void Paint (Option_t *option="")
 This method must be overridden if a class wants to paint itself. More...
 
virtual void Pop ()
 Pop on object drawn in a pad to the top of the display list. More...
 
virtual Int_t Read (const char *name)
 Read contents of object with specified name from the current directory. More...
 
virtual void RecursiveRemove (TObject *obj)
 Recursively remove this object from a list. More...
 
virtual void SaveAs (const char *filename="", Option_t *option="") const
 Save this object in the file specified by filename. More...
 
virtual void SavePrimitive (std::ostream &out, Option_t *option="")
 Save a primitive as a C++ statement(s) on output stream "out". More...
 
virtual void SetDrawOption (Option_t *option="")
 Set drawing option for object. More...
 
virtual void SetUniqueID (UInt_t uid)
 Set the unique object id. More...
 
virtual void UseCurrentStyle ()
 Set current style settings in this object This function is called when either TCanvas::UseCurrentStyle or TROOT::ForceStyle have been invoked. More...
 
virtual Int_t Write (const char *name=0, Int_t option=0, Int_t bufsize=0)
 Write this object to the current directory. More...
 
virtual Int_t Write (const char *name=0, Int_t option=0, Int_t bufsize=0) const
 Write this object to the current directory. More...
 
voidoperator new (size_t sz)
 
voidoperator new[] (size_t sz)
 
voidoperator new (size_t sz, void *vp)
 
voidoperator new[] (size_t sz, void *vp)
 
void operator delete (void *ptr)
 Operator delete. More...
 
void operator delete[] (void *ptr)
 Operator delete []. More...
 
void SetBit (UInt_t f, Bool_t set)
 Set or unset the user status bits as specified in f. More...
 
void SetBit (UInt_t f)
 
void ResetBit (UInt_t f)
 
Bool_t TestBit (UInt_t f) const
 
Int_t TestBits (UInt_t f) const
 
void InvertBit (UInt_t f)
 
virtual void Info (const char *method, const char *msgfmt,...) const
 Issue info message. More...
 
virtual void Warning (const char *method, const char *msgfmt,...) const
 Issue warning message. More...
 
virtual void Error (const char *method, const char *msgfmt,...) const
 Issue error message. More...
 
virtual void SysError (const char *method, const char *msgfmt,...) const
 Issue system error message. More...
 
virtual void Fatal (const char *method, const char *msgfmt,...) const
 Issue fatal error message. More...
 
void AbstractMethod (const char *method) const
 Use this method to implement an "abstract" method that you don't want to leave purely abstract. More...
 
void MayNotUse (const char *method) const
 Use this method to signal that a method (defined in a base class) may not be called in a derived class (in principle against good design since a child class should not provide less functionality than its parent, however, sometimes it is necessary). More...
 
void Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const
 Use this method to declare a method obsolete. More...
 

Private Attributes

UInt_t fMt [624]
 
Int_t fCount624
 

Additional Inherited Members

- Public Types inherited from TObject
enum  EStatusBits {
  kCanDelete = BIT(0), kMustCleanup = BIT(3), kObjInCanvas = BIT(3), kIsReferenced = BIT(4),
  kHasUUID = BIT(5), kCannotPick = BIT(6), kNoContextMenu = BIT(8), kInvalidObject = BIT(13)
}
 
enum  { kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kBitMask = 0x00ffffff }
 
enum  { kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) }
 
- Static Public Member Functions inherited from TObject
static Long_t GetDtorOnly ()
 Return destructor only flag. More...
 
static void SetDtorOnly (void *obj)
 Set destructor only flag. More...
 
static Bool_t GetObjectStat ()
 Get status of object stat flag. More...
 
static void SetObjectStat (Bool_t stat)
 Turn on/off tracking of objects in the TObjectTable. More...
 
- Protected Member Functions inherited from TObject
void MakeZombie ()
 
virtual void DoError (int level, const char *location, const char *fmt, va_list va) const
 Interface to ErrorHandler (protected). More...
 
- Protected Attributes inherited from TRandom
UInt_t fSeed
 
- Protected Attributes inherited from TNamed
TString fName
 
TString fTitle
 

#include <TRandom3.h>

+ Inheritance diagram for TRandom3:
+ Collaboration diagram for TRandom3:

Constructor & Destructor Documentation

TRandom3::TRandom3 ( UInt_t  seed = 4357)
TRandom3::~TRandom3 ( )
virtual

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

Definition at line 84 of file TRandom3.cxx.

Member Function Documentation

virtual UInt_t TRandom3::GetSeed ( ) const
inlinevirtual

Reimplemented from TRandom.

Definition at line 39 of file TRandom3.h.

Double_t TRandom3::Rndm ( Int_t  i = 0)
virtual

Machine independent random number generator.

Produces uniformly-distributed floating points in (0,1) Method: Mersenne Twister

Reimplemented from TRandom.

Definition at line 93 of file TRandom3.cxx.

Referenced by TLimitDataSource::AddChannel(), FillCArray(), FillMatrix(), FillMatrixSym(), TMVA::Interval::GetRndm(), TMVA::LogInterval::GetRndm(), initValues(), RndmArray(), SetSeed(), TRandom1::SetSeed2(), and testNdimFit().

void TRandom3::RndmArray ( Int_t  n,
Float_t array 
)
virtual

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

Reimplemented from TRandom.

Definition at line 137 of file TRandom3.cxx.

Referenced by fillRandom(), and main().

void TRandom3::RndmArray ( Int_t  n,
Double_t array 
)
virtual

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

Reimplemented from TRandom.

Definition at line 145 of file TRandom3.cxx.

void TRandom3::SetSeed ( UInt_t  seed = 0)
virtual

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

Reimplemented from TRandom.

Definition at line 200 of file TRandom3.cxx.

Referenced by TSVDUnfold::GetAdetCovMatrix(), TSVDUnfold::GetUnfoldCovMatrix(), initMatrix(), TMVA::RandomGenerator::RandomGenerator(), testkdTreeBinning(), writeCArray(), writeSMatrix(), writeSMatrixSym(), writeTMatrix(), writeTMatrixSym(), writeTrackD(), and writeTrackD32().

Member Data Documentation

Int_t TRandom3::fCount624
private

Definition at line 33 of file TRandom3.h.

Referenced by Rndm(), RndmArray(), and SetSeed().

UInt_t TRandom3::fMt[624]
private

Definition at line 32 of file TRandom3.h.

Referenced by Rndm(), RndmArray(), and SetSeed().


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