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1 | /************************************************************************** | |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
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 | **************************************************************************/ | |
15 | ||
16 | /* $Id$ */ | |
17 | ||
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 | /////////////////////////////////////////////////////////////////////////////// | |
25 | ||
26 | #include <TClass.h> | |
27 | #include <TFile.h> | |
28 | #include <TError.h> | |
29 | #include <TRandom3.h> | |
30 | #include <TSystem.h> | |
31 | ||
32 | #include "AliRndm.h" | |
33 | #include "AliLog.h" | |
34 | ||
35 | ClassImp(AliRndm) | |
36 | ||
37 | //_______________________________________________________________________ | |
38 | AliRndm::AliRndm(): | |
39 | fRandom(gRandom) | |
40 | { | |
41 | // | |
42 | // Default ctor | |
43 | // | |
44 | } | |
45 | ||
46 | //_______________________________________________________________________ | |
47 | AliRndm::AliRndm(const AliRndm& rn): | |
48 | fRandom(gRandom) | |
49 | { | |
50 | // | |
51 | // Copy constructor | |
52 | // | |
53 | rn.Copy(*this); | |
54 | } | |
55 | ||
56 | //_______________________________________________________________________ | |
57 | void AliRndm::Copy(AliRndm&) const | |
58 | { | |
59 | AliFatalClass("Not implemented"); | |
60 | } | |
61 | ||
62 | ||
63 | //_____________________________________________________________________________ | |
64 | void AliRndm::Rndm(Float_t* array, Int_t size) const | |
65 | { | |
66 | // | |
67 | // Return an array of n random numbers uniformly distributed | |
68 | // between 0 and 1 not included | |
69 | // | |
70 | for(Int_t i=0; i<size; i++) | |
71 | #ifdef CKNONE | |
72 | array[i]=fRandom->Rndm(); | |
73 | #else | |
74 | do array[i]=fRandom->Rndm(); while(0>=array[i] || array[i]>=1); | |
75 | #endif | |
76 | } | |
77 | ||
78 | //_____________________________________________________________________________ | |
79 | void AliRndm::ReadRandom(const char *filename) | |
80 | { | |
81 | // | |
82 | // Reads saved random generator status from filename | |
83 | // | |
84 | char *fntmp = gSystem->ExpandPathName(filename); | |
85 | TFile *file = new TFile(fntmp,"r"); | |
86 | delete [] fntmp; | |
87 | if(!file) { | |
88 | AliErrorClass(Form("Could not open file %s",filename)); | |
89 | } else { | |
90 | if(!fRandom) fRandom = new TRandom(); | |
91 | fRandom->Read("Random"); | |
92 | file->Close(); | |
93 | delete file; | |
94 | } | |
95 | } | |
96 | ||
97 | //_____________________________________________________________________________ | |
98 | void AliRndm::WriteRandom(const char *filename) const | |
99 | { | |
100 | // | |
101 | // Writes random generator status to filename | |
102 | // | |
103 | char *fntmp = gSystem->ExpandPathName(filename); | |
104 | TFile *file = new TFile(fntmp,"new"); | |
105 | delete [] fntmp; | |
106 | if(!file) { | |
107 | AliErrorClass(Form("Could not open file %s",filename)); | |
108 | } else { | |
109 | fRandom->Write(); | |
110 | file->Close(); | |
111 | delete file; | |
112 | } | |
113 | } |