1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 ///////////////////////////////////////////////////////////////////////////////
19 // Random number class for AliRoot
20 // This class allows to have different
21 // random number generator for different
22 // elements of AliRoot //
23 // It also allows saving and retrieving of the random number seeds
24 ///////////////////////////////////////////////////////////////////////////////
37 //_______________________________________________________________________
46 //_______________________________________________________________________
47 AliRndm::AliRndm(const AliRndm& rn):
56 //_______________________________________________________________________
57 void AliRndm::Copy(AliRndm&) const
59 AliFatalClass("Not implemented");
63 //_____________________________________________________________________________
64 void AliRndm::Rndm(Float_t* array, Int_t size) const
67 // Return an array of n random numbers uniformly distributed
68 // between 0 and 1 not included
70 for(Int_t i=0; i<size; i++)
72 array[i]=fRandom->Rndm();
74 do array[i]=fRandom->Rndm(); while(0>=array[i] || array[i]>=1);
78 //_____________________________________________________________________________
79 void AliRndm::ReadRandom(const char *filename)
82 // Reads saved random generator status from filename
84 char *fntmp = gSystem->ExpandPathName(filename);
85 TFile *file = new TFile(fntmp,"r");
88 AliErrorClass(Form("Could not open file %s",filename));
90 if(!fRandom) fRandom = new TRandom();
91 fRandom->Read("Random");
97 //_____________________________________________________________________________
98 void AliRndm::WriteRandom(const char *filename) const
101 // Writes random generator status to filename
103 char *fntmp = gSystem->ExpandPathName(filename);
104 TFile *file = new TFile(fntmp,"new");
107 AliErrorClass(Form("Could not open file %s",filename));