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ROOT 6.10/09 Reference Guide |
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ROOT 6.10/09 Reference Guide |
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 27 of file TRandom3.h.
Public Member Functions | |
| TRandom3 (UInt_t seed=4357) | |
| -*-*-*-*-*-*-*-*-*-*default constructor-*-*-*-*-*-*-*-*-*-*-*-*-*-* If seed is 0, the seed is automatically computed via a TUUID object. More... | |
| virtual | ~TRandom3 () |
| -*-*-*-*-*-*-*-*-*-*default destructor-*-*-*-*-*-*-*-*-*-*-*-*-*-* *-* ================== More... | |
| virtual UInt_t | GetSeed () const |
| virtual Double_t | Rndm () |
| 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 (ULong_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) | |
| 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 | 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 Double_t | Rndm (Int_t) |
| 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) | |
| TNamed copy ctor. More... | |
| virtual | ~TNamed () |
| 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... | |
| 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 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 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 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 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... | |
| Bool_t | IsOnHeap () const |
| Bool_t | IsZombie () const |
| 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 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, Bool_t set) |
| Set or unset the user status bits as specified in f. More... | |
| void | SetBit (UInt_t f) |
| 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... | |
| 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 () |
Private Attributes | |
| Int_t | fCount624 |
| UInt_t | fMt [624] |
Additional Inherited Members | |
| Public Types inherited from TObject | |
| enum | { kIsOnHeap = 0x01000000, kNotDeleted = 0x02000000, kZombie = 0x04000000, kBitMask = 0x00ffffff } |
| enum | { kSingleKey = BIT(0), kOverwrite = BIT(1), kWriteDelete = BIT(2) } |
| 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) } |
| 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 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 () |
| Protected Attributes inherited from TRandom | |
| UInt_t | fSeed |
| Protected Attributes inherited from TNamed | |
| TString | fName |
| TString | fTitle |
#include <TRandom3.h>
| TRandom3::TRandom3 | ( | UInt_t | seed = 4357 | ) |
-*-*-*-*-*-*-*-*-*-*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.
Definition at line 74 of file TRandom3.cxx.
|
virtual |
-*-*-*-*-*-*-*-*-*-*default destructor-*-*-*-*-*-*-*-*-*-*-*-*-*-* *-* ==================
Definition at line 85 of file TRandom3.cxx.
|
inlinevirtual |
Reimplemented from TRandom.
Definition at line 37 of file TRandom3.h.
|
virtual |
Machine independent random number generator.
Produces uniformly-distributed floating points in (0,1) Method: Mersenne Twister
Reimplemented from TRandom.
Definition at line 94 of file TRandom3.cxx.
Return an array of n random numbers uniformly distributed in ]0,1].
Reimplemented from TRandom.
Definition at line 138 of file TRandom3.cxx.
Return an array of n random numbers uniformly distributed in ]0,1].
Reimplemented from TRandom.
Definition at line 146 of file TRandom3.cxx.
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 201 of file TRandom3.cxx.
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private |
Definition at line 31 of file TRandom3.h.
|
private |
Definition at line 30 of file TRandom3.h.
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