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ROOT
Reference Guide |
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ROOT
Reference Guide |
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Random number generator class based on the maximally quidistributed combined Tausworthe generator by L'Ecuyer.
The period of the generator is 2**88 (about 10**26) and it uses only 3 words for the state.
For more information see: P. L'Ecuyer, Mathematics of Computation, 65, 213 (1996) P. L'Ecuyer, Mathematics of Computation, 68, 225 (1999)
The publication are available online at [http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme.ps] [http://www.iro.umontreal.ca/~lecuyer/myftp/papers/tausme2.ps]
Definition at line 27 of file TRandom2.h.
Public Member Functions | |
| TRandom2 (UInt_t seed=1) | |
| Default constructor. More... | |
| virtual | ~TRandom2 () |
| Default destructor. More... | |
| virtual Double_t | Rndm () |
| TausWorth generator from L'Ecuyer, uses as seed 3x32bits integers Use a mask of 0xffffffffUL to make in work on 64 bit machines Periodicity of about 10**26 Generate number in interval (0,1) : 0 and 1 are not included in the interval. More... | |
| virtual Double_t | Rndm () |
| Machine independent random number generator. More... | |
| virtual Double_t | Rndm (Int_t) |
| virtual void | RndmArray (Int_t n, Double_t *array) |
| Return an array of n random numbers uniformly distributed in ]0,1]. 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 | SetSeed (ULong_t seed=0) |
| Set the generator seed. More... | |
 Public Member Functions inherited from TRandom | |
| TRandom (UInt_t seed=65539) | |
| Default constructor. For seed see SetSeed(). More... | |
| 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 | GetSeed () const |
| virtual UInt_t | Integer (UInt_t imax) |
| Returns a random integer uniformly distributed on the interval [ 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 (Double_t &a, Double_t &b) |
| Return 2 numbers distributed following a gaussian with mean=0 and sigma=1. 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 | ReadRandom (const char *filename) |
| Reads saved random generator status from filename. More... | |
| virtual Double_t | Rndm () |
| Machine independent random number generator. More... | |
| virtual Double_t | Rndm (Int_t) |
| virtual void | RndmArray (Int_t n, Double_t *array) |
| Return an array of n random numbers uniformly distributed in ]0,1]. 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 | SetSeed (ULong_t seed=0) |
| Set the random generator seed. 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, Double_t x2) |
| Returns a uniform deviate on the interval (x1, x2). More... | |
| virtual Double_t | Uniform (Double_t x1=1) |
| Returns a uniform deviate on the interval (0, x1). 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 TNamed &named) | |
| TNamed copy ctor. More... | |
| TNamed (const TString &name, const TString &title) | |
| virtual | ~TNamed () |
| TNamed destructor. More... | |
| virtual void | Clear (Option_t *option="") |
| Set name and title to empty strings (""). More... | |
| virtual TObject * | Clone (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 | ls (Option_t *option="") const |
| List TNamed name and title. More... | |
| TNamed & | operator= (const TNamed &rhs) |
| TNamed assignment operator. More... | |
| virtual void | Print (Option_t *option="") const |
| Print TNamed name and title. More... | |
| virtual void | SetName (const char *name) |
| Set the name of the TNamed. More... | |
| virtual void | SetNameTitle (const char *name, const char *title) |
| Set all the TNamed parameters (name and title). More... | |
| virtual void | SetTitle (const char *title="") |
| Set the title of the TNamed. More... | |
| virtual Int_t | Sizeof () const |
| Return size of the TNamed part of the TObject. More... | |
| Public Member Functions inherited from TObject | |
| TObject () | |
| TObject constructor. More... | |
| TObject (const TObject &object) | |
| TObject copy ctor. More... | |
| virtual | ~TObject () |
| TObject destructor. 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... | |
| 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... | |
| ULong_t | CheckedHash () |
| Check and record whether this class has a consistent Hash/RecursiveRemove setup (*) and then return the regular Hash value for this object. More... | |
| virtual const char * | ClassName () const |
| Returns name of class to which the object belongs. More... | |
| virtual void | Clear (Option_t *="") |
| virtual TObject * | Clone (const char *newname="") const |
| Make a clone of an object using the Streamer facility. More... | |
| virtual Int_t | Compare (const TObject *obj) const |
| Compare abstract method. More... | |
| virtual void | Copy (TObject &object) const |
| Copy this to obj. 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 TObject * | DrawClone (Option_t *option="") const |
Draw a clone of this object in the current selected pad for instance with: gROOT->SetSelectedPad(gPad). More... | |
| virtual void | Dump () const |
| Dump contents of object on stdout. More... | |
| virtual void | Error (const char *method, const char *msgfmt,...) const |
| Issue error message. 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 void | Fatal (const char *method, const char *msgfmt,...) const |
| Issue fatal error message. More... | |
| virtual TObject * | FindObject (const char *name) const |
| Must be redefined in derived classes. More... | |
| virtual TObject * | FindObject (const TObject *obj) const |
| Must be redefined in derived classes. More... | |
| virtual Option_t * | GetDrawOption () const |
| Get option used by the graphics system to draw this object. More... | |
| virtual const char * | GetIconName () const |
| Returns mime type name of object. More... | |
| virtual const char * | GetName () const |
| Returns name of object. More... | |
| virtual char * | GetObjectInfo (Int_t px, Int_t py) const |
| Returns string containing info about the object at position (px,py). More... | |
| virtual Option_t * | GetOption () const |
| virtual const char * | GetTitle () const |
| Returns title of object. More... | |
| virtual UInt_t | GetUniqueID () const |
| Return the unique object id. More... | |
| virtual Bool_t | HandleTimer (TTimer *timer) |
| Execute action in response of a timer timing out. More... | |
| virtual ULong_t | Hash () const |
| Return hash value for this object. More... | |
| Bool_t | HasInconsistentHash () const |
| Return true is the type of this object is known to have an inconsistent setup for Hash and RecursiveRemove (i.e. More... | |
| virtual void | Info (const char *method, const char *msgfmt,...) const |
| Issue info message. 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... | |
| void | InvertBit (UInt_t f) |
| virtual Bool_t | IsEqual (const TObject *obj) const |
| Default equal comparison (objects are equal if they have the same address in memory). More... | |
| virtual Bool_t | IsFolder () const |
| Returns kTRUE in case object contains browsable objects (like containers or lists of other objects). More... | |
| R__ALWAYS_INLINE Bool_t | IsOnHeap () const |
| virtual Bool_t | IsSortable () const |
| R__ALWAYS_INLINE Bool_t | IsZombie () const |
| virtual void | ls (Option_t *option="") const |
| The ls function lists the contents of a class on stdout. 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... | |
| virtual Bool_t | Notify () |
| This method must be overridden to handle object notification. More... | |
| void | Obsolete (const char *method, const char *asOfVers, const char *removedFromVers) const |
| Use this method to declare a method obsolete. More... | |
| void | operator delete (void *ptr) |
| Operator delete. More... | |
| void | operator delete[] (void *ptr) |
| Operator delete []. More... | |
| void * | operator new (size_t sz) |
| void * | operator new (size_t sz, void *vp) |
| void * | operator new[] (size_t sz) |
| void * | operator new[] (size_t sz, void *vp) |
| TObject & | operator= (const TObject &rhs) |
| TObject assignment operator. 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 void | Print (Option_t *option="") const |
| This method must be overridden when a class wants to print itself. 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... | |
| void | ResetBit (UInt_t f) |
| 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... | |
| void | SetBit (UInt_t f) |
| void | SetBit (UInt_t f, Bool_t set) |
| Set or unset the user status bits as specified in f. 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 | SysError (const char *method, const char *msgfmt,...) const |
| Issue system error message. More... | |
| R__ALWAYS_INLINE Bool_t | TestBit (UInt_t f) const |
| Int_t | TestBits (UInt_t f) const |
| 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 void | Warning (const char *method, const char *msgfmt,...) const |
| Issue warning message. 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... | |
| Public Member Functions inherited from ROOT::Math::TRandomEngine | |
| virtual | ~TRandomEngine () |
| virtual double | Rndm ()=0 |
Protected Attributes | |
| UInt_t | fSeed1 |
| UInt_t | fSeed2 |
| Protected Attributes inherited from TRandom | |
| UInt_t | fSeed |
| Protected Attributes inherited from TNamed | |
| TString | fName |
| TString | fTitle |
Additional Inherited Members | |
| Public Types inherited from TObject | |
| enum | { kIsOnHeap = 0x01000000 , kNotDeleted = 0x02000000 , kZombie = 0x04000000 , kInconsistent = 0x08000000 , kBitMask = 0x00ffffff } |
| enum | { kSingleKey = BIT(0) , kOverwrite = BIT(1) , kWriteDelete = BIT(2) } |
| enum | EDeprecatedStatusBits { kObjInCanvas = BIT(3) } |
| enum | EStatusBits { kCanDelete = BIT(0) , kMustCleanup = BIT(3) , kIsReferenced = BIT(4) , kHasUUID = BIT(5) , kCannotPick = BIT(6) , kNoContextMenu = BIT(8) , kInvalidObject = BIT(13) } |
| Static Public Member Functions inherited from TObject | |
| static Long_t | GetDtorOnly () |
| Return destructor only flag. More... | |
| static Bool_t | GetObjectStat () |
| Get status of object stat flag. More... | |
| static void | SetDtorOnly (void *obj) |
| Set destructor only flag. More... | |
| static void | SetObjectStat (Bool_t stat) |
| Turn on/off tracking of objects in the TObjectTable. More... | |
| Protected Types inherited from TObject | |
| enum | { kOnlyPrepStep = BIT(3) } |
| Protected Member Functions inherited from TObject | |
| virtual void | DoError (int level, const char *location, const char *fmt, va_list va) const |
| Interface to ErrorHandler (protected). More... | |
| void | MakeZombie () |
#include <TRandom2.h>
| TRandom2::TRandom2 | ( | UInt_t | seed = 1 | ) |
Default constructor.
Definition at line 36 of file TRandom2.cxx.
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virtual |
Default destructor.
Definition at line 46 of file TRandom2.cxx.
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virtual |
TausWorth generator from L'Ecuyer, uses as seed 3x32bits integers Use a mask of 0xffffffffUL to make in work on 64 bit machines Periodicity of about 10**26 Generate number in interval (0,1) : 0 and 1 are not included in the interval.
Reimplemented from TRandom.
Definition at line 56 of file TRandom2.cxx.
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virtual |
Machine independent random number generator.
Based on the BSD Unix (Rand) Linear congrential generator. Produces uniformly-distributed floating points between 0 and 1. Identical sequence on all machines of >= 32 bits. Periodicity = 2**31, generates a number in (0,1). Note that this is a generator which is known to have defects (the lower random bits are correlated) and therefore should NOT be used in any statistical study).
Reimplemented from TRandom.
Definition at line 49 of file TRandom.cxx.
Return an array of n random numbers uniformly distributed in ]0,1].
Reimplemented from TRandom.
Definition at line 95 of file TRandom2.cxx.
Return an array of n random numbers uniformly distributed in ]0,1].
Reimplemented from TRandom.
Definition at line 75 of file TRandom2.cxx.
Set the generator seed.
If the seed given is zero, generate automatically seed values which are different every time by using TRandom3 and TUUID If a seed is given generate the other two needed for the generator state using a linear congruential generator The only condition, stated at the end of the 1999 L'Ecuyer paper is that the seeds must be greater than 1,7 and 15. Note that after seeting the seed the generator is warmed up by calling it internally few times therefore the returned seed in TRandom2::GetSeed will be a different value. For this generator the user will have to store the provided seed externally if he wants to reproduce the random sequence
Reimplemented from TRandom.
Definition at line 123 of file TRandom2.cxx.
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protected |
Definition at line 30 of file TRandom2.h.
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protected |
Definition at line 31 of file TRandom2.h.
