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TRandom.h
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1// @(#)root/mathcore:$Id$
2// Author: Rene Brun 15/12/95
3
4/*************************************************************************
5 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
6 * All rights reserved. *
7 * *
8 * For the licensing terms see $ROOTSYS/LICENSE. *
9 * For the list of contributors see $ROOTSYS/README/CREDITS. *
10 *************************************************************************/
11
12#ifndef ROOT_TRandom
13#define ROOT_TRandom
14
15#include "Math/TRandomEngine.h"
16
17//////////////////////////////////////////////////////////////////////////
18// //
19// TRandom //
20// //
21// Simple prototype random number generator class (periodicity = 10**9) //
22// //
23//////////////////////////////////////////////////////////////////////////
24
25#include "TNamed.h"
26
27class TRandom : public TNamed, public ROOT::Math::TRandomEngine {
28
29protected:
30 UInt_t fSeed; //Random number generator seed
31
32public:
33 TRandom(UInt_t seed=65539);
34 ~TRandom() override;
35 virtual Int_t Binomial(Int_t ntot, Double_t prob);
36 virtual Double_t BreitWigner(Double_t mean=0, Double_t gamma=1);
37 virtual void Circle(Double_t &x, Double_t &y, Double_t r);
38 virtual Double_t Exp(Double_t tau);
39 virtual Double_t Gaus(Double_t mean=0, Double_t sigma=1);
40 virtual UInt_t GetSeed() const;
41 virtual UInt_t Integer(UInt_t imax);
42 virtual Double_t Landau(Double_t mean=0, Double_t sigma=1);
43 virtual Int_t Poisson(Double_t mean);
44 virtual Double_t PoissonD(Double_t mean);
45 virtual void Rannor(Float_t &a, Float_t &b);
46 virtual void Rannor(Double_t &a, Double_t &b);
47 virtual void ReadRandom(const char *filename);
48 virtual void SetSeed(ULong_t seed=0);
49 Double_t Rndm() override;
50 // keep for backward compatibility
51 virtual Double_t Rndm(Int_t ) { return Rndm(); }
52 virtual void RndmArray(Int_t n, Float_t *array);
53 virtual void RndmArray(Int_t n, Double_t *array);
54 virtual void Sphere(Double_t &x, Double_t &y, Double_t &z, Double_t r);
55 virtual Double_t Uniform(Double_t x1=1);
56 virtual Double_t Uniform(Double_t x1, Double_t x2);
57 virtual void WriteRandom(const char *filename) const;
58
59 ClassDefOverride(TRandom,3) //Simple Random number generator (periodicity = 10**9)
60};
61
62R__EXTERN TRandom *gRandom;
63
64#endif
R__EXTERN
#define R__EXTERN
Definition: DllImport.h:27
Int_t
int Int_t
Definition: RtypesCore.h:45
Float_t
float Float_t
Definition: RtypesCore.h:57
Double_t
double Double_t
Definition: RtypesCore.h:59
ULong_t
unsigned long ULong_t
Definition: RtypesCore.h:55
ClassDefOverride
#define ClassDefOverride(name, id)
Definition: Rtypes.h:339
filename
Option_t Option_t TPoint TPoint const char GetTextMagnitude GetFillStyle GetLineColor GetLineWidth GetMarkerStyle GetTextAlign GetTextColor GetTextSize void char Point_t Rectangle_t WindowAttributes_t Float_t Float_t Float_t Int_t Int_t UInt_t UInt_t Rectangle_t Int_t Int_t Window_t TString Int_t GCValues_t GetPrimarySelectionOwner GetDisplay GetScreen GetColormap GetNativeEvent const char const char dpyName wid window const char font_name cursor keysym reg const char only_if_exist regb h Point_t winding char text const char depth char const char Int_t count const char ColorStruct_t color const char filename
Definition: TGWin32VirtualXProxy.cxx:232
b
Option_t Option_t TPoint TPoint const char GetTextMagnitude GetFillStyle GetLineColor GetLineWidth GetMarkerStyle GetTextAlign GetTextColor GetTextSize void char Point_t Rectangle_t WindowAttributes_t Float_t Float_t Float_t b
Definition: TGWin32VirtualXProxy.cxx:168
r
Option_t Option_t TPoint TPoint const char GetTextMagnitude GetFillStyle GetLineColor GetLineWidth GetMarkerStyle GetTextAlign GetTextColor GetTextSize void char Point_t Rectangle_t WindowAttributes_t Float_t r
Definition: TGWin32VirtualXProxy.cxx:168
x2
Option_t Option_t TPoint TPoint const char x2
Definition: TGWin32VirtualXProxy.cxx:70
x1
Option_t Option_t TPoint TPoint const char x1
Definition: TGWin32VirtualXProxy.cxx:70
gRandom
R__EXTERN TRandom * gRandom
Definition: TRandom.h:62
TNamed
The TNamed class is the base class for all named ROOT classes.
Definition: TNamed.h:29
TRandom
This is the base class for the ROOT Random number generators.
Definition: TRandom.h:27
TRandom::Gaus
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 sigm...
Definition: TRandom.cxx:274
TRandom::RndmArray
virtual void RndmArray(Int_t n, Float_t *array)
Return an array of n random numbers uniformly distributed in ]0,1].
Definition: TRandom.cxx:588
TRandom::Poisson
virtual Int_t Poisson(Double_t mean)
Generates a random integer N according to a Poisson law.
Definition: TRandom.cxx:402
TRandom::SetSeed
virtual void SetSeed(ULong_t seed=0)
Set the random generator seed.
Definition: TRandom.cxx:608
TRandom::WriteRandom
virtual void WriteRandom(const char *filename) const
Writes random generator status to filename.
Definition: TRandom.cxx:690
TRandom::Rndm
Double_t Rndm() override
Machine independent random number generator.
Definition: TRandom.cxx:552
TRandom::fSeed
UInt_t fSeed
Definition: TRandom.h:30
TRandom::Rannor
virtual void Rannor(Float_t &a, Float_t &b)
Return 2 numbers distributed following a gaussian with mean=0 and sigma=1.
Definition: TRandom.cxx:500
TRandom::PoissonD
virtual Double_t PoissonD(Double_t mean)
Generates a random number according to a Poisson law.
Definition: TRandom.cxx:454
TRandom::ReadRandom
virtual void ReadRandom(const char *filename)
Reads saved random generator status from filename.
Definition: TRandom.cxx:530
TRandom::GetSeed
virtual UInt_t GetSeed() const
Get the random generator seed.
Definition: TRandom.cxx:641
TRandom::Exp
virtual Double_t Exp(Double_t tau)
Returns an exponential deviate.
Definition: TRandom.cxx:251
TRandom::Circle
virtual void Circle(Double_t &x, Double_t &y, Double_t r)
Generates random vectors, uniformly distributed over a circle of given radius.
Definition: TRandom.cxx:239
TRandom::Uniform
virtual Double_t Uniform(Double_t x1=1)
Returns a uniform deviate on the interval (0, x1).
Definition: TRandom.cxx:672
TRandom::Sphere
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.
Definition: TRandom.cxx:654
TRandom::Landau
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 paramet...
Definition: TRandom.cxx:380
TRandom::TRandom
TRandom(UInt_t seed=65539)
Default constructor. For seed see SetSeed().
Definition: TRandom.cxx:186
TRandom::Binomial
virtual Int_t Binomial(Int_t ntot, Double_t prob)
Generates a random integer N according to the binomial law.
Definition: TRandom.cxx:211
TRandom::BreitWigner
virtual Double_t BreitWigner(Double_t mean=0, Double_t gamma=1)
Return a number distributed following a BreitWigner function with mean and gamma.
Definition: TRandom.cxx:225
TRandom::~TRandom
~TRandom() override
Default destructor.
Definition: TRandom.cxx:195
TRandom::Rndm
virtual Double_t Rndm(Int_t)
Definition: TRandom.h:51
TRandom::Integer
virtual UInt_t Integer(UInt_t imax)
Returns a random integer uniformly distributed on the interval [ 0, imax-1 ].
Definition: TRandom.cxx:360
sigma
const Double_t sigma
Definition: h1analysisProxy.h:11
y
Double_t y[n]
Definition: legend1.C:17
x
Double_t x[n]
Definition: legend1.C:17
n
const Int_t n
Definition: legend1.C:16
ROOT::Math::Cephes::gamma
double gamma(double x)
Definition: SpecFuncCephes.cxx:339
a
TArc a
Definition: textangle.C:12