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25 // 25 //
26 // G4ImportanceAlgorithm implementation <<
27 // 26 //
28 // Author: Michael Dressel (CERN), 2002 << 27 // $Id: G4ImportanceAlgorithm.cc 66356 2012-12-18 09:02:32Z gcosmo $
>> 28 //
>> 29 // ----------------------------------------------------------------------
>> 30 // GEANT 4 class source file
>> 31 //
>> 32 // G4ImportanceAlgorithm.cc
>> 33 //
29 // ------------------------------------------- 34 // ----------------------------------------------------------------------
30 35
31 #include "G4Types.hh" 36 #include "G4Types.hh"
>> 37 #include <sstream>
32 #include "Randomize.hh" 38 #include "Randomize.hh"
33 #include "G4Threading.hh" <<
34 #include "G4AutoLock.hh" <<
35 39
36 #include "G4ImportanceAlgorithm.hh" 40 #include "G4ImportanceAlgorithm.hh"
37 41
38 #include <sstream> << 42 G4ImportanceAlgorithm::G4ImportanceAlgorithm(): fWorned(false)
39 <<
40 namespace <<
41 { 43 {
42 G4Mutex ImportanceMutex = G4MUTEX_INITIALIZE <<
43 } 44 }
44 45
45 G4ImportanceAlgorithm::G4ImportanceAlgorithm() << 46 G4ImportanceAlgorithm::~G4ImportanceAlgorithm()
46 << 47 {
47 G4ImportanceAlgorithm::~G4ImportanceAlgorithm( << 48 }
48 49
49 G4Nsplit_Weight 50 G4Nsplit_Weight
50 G4ImportanceAlgorithm::Calculate(G4double ipre 51 G4ImportanceAlgorithm::Calculate(G4double ipre,
51 G4double ipos << 52 G4double ipost,
52 G4double init 53 G4double init_w) const
53 { 54 {
54 G4AutoLock l(&ImportanceMutex); << 55 G4Nsplit_Weight nw = {0,0};
55 G4Nsplit_Weight nw; << 56 if (ipost>0.){
56 if (ipost>0.) << 57 if (!(ipre>0.)){
57 { <<
58 if (!(ipre>0.)) <<
59 { <<
60 Error("Calculate() - ipre==0."); 58 Error("Calculate() - ipre==0.");
61 } 59 }
62 G4double ipre_over_ipost = ipre/ipost; 60 G4double ipre_over_ipost = ipre/ipost;
63 if ((ipre_over_ipost<0.25 || ipre_over_ipo << 61 if ((ipre_over_ipost<0.25 || ipre_over_ipost> 4) && !fWorned) {
64 { <<
65 std::ostringstream os; 62 std::ostringstream os;
66 os << "Calculate() - ipre_over_ipost ! i 63 os << "Calculate() - ipre_over_ipost ! in [0.25, 4]." << G4endl
67 << "ipre_over_ipost = " << ipre_over_ 64 << "ipre_over_ipost = " << ipre_over_ipost << ".";
68 Warning(os.str()); 65 Warning(os.str());
69 fWarned = true; << 66 fWorned = true;
70 if (ipre_over_ipost<=0) << 67 if (ipre_over_ipost<=0) {
71 { << 68 Error("Calculate() - ipre_over_ipost<=0.");
72 Error("Calculate() - ipre_over_ipost<= <<
73 } 69 }
74 } 70 }
75 if (init_w<=0.) << 71 if (init_w<=0.) {
76 { <<
77 Error("Calculate() - iniitweight<= 0. fo 72 Error("Calculate() - iniitweight<= 0. found!");
78 } 73 }
79 74
80 // default geometrical splitting 75 // default geometrical splitting
81 // in integer mode 76 // in integer mode
82 // for ipre_over_ipost <= 1 77 // for ipre_over_ipost <= 1
83 G4double inv = 1./ipre_over_ipost; 78 G4double inv = 1./ipre_over_ipost;
84 nw.fN = static_cast<G4int>(inv); 79 nw.fN = static_cast<G4int>(inv);
85 nw.fW = init_w * ipre_over_ipost; 80 nw.fW = init_w * ipre_over_ipost;
86 81
87 // geometrical splitting for double mode 82 // geometrical splitting for double mode
88 if (ipre_over_ipost<1) << 83 if (ipre_over_ipost<1) {
89 { << 84 if ( static_cast<G4double>(nw.fN) != inv) {
90 if ( static_cast<G4double>(nw.fN) != inv << 85 // double mode
91 { << 86 // probability p for splitting into n+1 tracks
92 // double mode << 87 G4double p = inv - nw.fN;
93 // probability p for splitting into n+ << 88 // get a random number out of [0,1)
94 G4double p = inv - nw.fN; << 89 G4double r = G4UniformRand();
95 // get a random number out of [0,1) << 90 if (r<p) {
96 G4double r = G4UniformRand(); << 91 nw.fN++;
97 if (r<p) << 92 }
98 { <<
99 ++nw.fN; <<
100 } <<
101 } 93 }
102 } 94 }
103 else if (ipre_over_ipost>1) // russian r << 95 // ipre_over_ipost > 1
104 { << 96 // russian roulett
>> 97 else if (ipre_over_ipost>1) {
105 // probabiity for killing track 98 // probabiity for killing track
106 G4double p = 1-inv; 99 G4double p = 1-inv;
107 // get a random number out of [0,1) 100 // get a random number out of [0,1)
108 G4double r = G4UniformRand(); 101 G4double r = G4UniformRand();
109 if (r<p) << 102 if (r<p) {
110 { << 103 // kill track
111 // kill track << 104 nw.fN = 0;
112 nw.fN = 0; << 105 nw.fW = 0;
113 nw.fW = 0; <<
114 } 106 }
115 else << 107 else {
116 { << 108 nw.fN = 1;
117 nw.fN = 1; <<
118 } 109 }
119 } 110 }
120 } 111 }
121 l.unlock(); <<
122 <<
123 return nw; 112 return nw;
124 } 113 }
125 114
126 void G4ImportanceAlgorithm::Error(const G4Stri << 115 void G4ImportanceAlgorithm::Error(const G4String &msg) const
127 { 116 {
128 G4Exception("G4ImportanceAlgorithm::Error()" 117 G4Exception("G4ImportanceAlgorithm::Error()",
129 "GeomBias0002", FatalException, 118 "GeomBias0002", FatalException, msg);
130 } 119 }
131 120
132 void G4ImportanceAlgorithm::Warning(const G4St << 121 void G4ImportanceAlgorithm::Warning(const G4String &msg) const
133 { 122 {
134 G4Exception("G4ImportanceAlgorithm::Warning( 123 G4Exception("G4ImportanceAlgorithm::Warning()",
135 "GeomBias1001", JustWarning, msg 124 "GeomBias1001", JustWarning, msg);
136 } 125 }
137 126