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25 // 25 //
26 // G4WeightWindowAlgorithm implementation <<
27 // 26 //
28 // Author: Michael Dressel (CERN), 2003 << 27 // $Id: G4WeightWindowAlgorithm.cc,v 1.8 2006/06/29 18:18:01 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-08-01-patch-01 $
>> 29 //
>> 30 // ----------------------------------------------------------------------
>> 31 // GEANT 4 class source file
>> 32 //
>> 33 // G4WeightWindowAlgorithm.cc
>> 34 //
29 // ------------------------------------------- 35 // ----------------------------------------------------------------------
30 #include "G4WeightWindowAlgorithm.hh" 36 #include "G4WeightWindowAlgorithm.hh"
31 #include "Randomize.hh" 37 #include "Randomize.hh"
32 38
>> 39
33 G4WeightWindowAlgorithm:: 40 G4WeightWindowAlgorithm::
34 G4WeightWindowAlgorithm(G4double upperLimitFac << 41 G4WeightWindowAlgorithm(G4double upperLimitFaktor,
35 G4double survivalFacto << 42 G4double survivalFaktor,
36 G4int maxNumberOfSplit << 43 G4int maxNumberOfSplits) :
37 : fUpperLimitFactor(upperLimitFactor), << 44 fUpperLimitFaktor(upperLimitFaktor),
38 fSurvivalFactor(survivalFactor), << 45 fSurvivalFaktor(survivalFaktor),
39 fMaxNumberOfSplits(maxNumberOfSplits) << 46 fMaxNumberOfSplits(maxNumberOfSplits)
40 { << 47 {}
41 } << 48
>> 49 G4WeightWindowAlgorithm::~G4WeightWindowAlgorithm()
>> 50 {}
>> 51
42 52
43 G4WeightWindowAlgorithm::~G4WeightWindowAlgori <<
44 53
45 G4Nsplit_Weight 54 G4Nsplit_Weight
46 G4WeightWindowAlgorithm::Calculate(G4double in 55 G4WeightWindowAlgorithm::Calculate(G4double init_w,
47 G4double lo << 56 G4double lowerWeightBound) const {
48 { << 57
49 G4double survivalWeight = lowerWeightBound * << 58 G4double survivalWeight = lowerWeightBound * fSurvivalFaktor;
50 G4double upperWeight = lowerWeightBound * fU << 59 G4double upperWeight = lowerWeightBound * fUpperLimitFaktor;
51 60
52 // initialize return value for case weight i 61 // initialize return value for case weight in window
53 // <<
54 G4Nsplit_Weight nw; 62 G4Nsplit_Weight nw;
55 nw.fN = 1; 63 nw.fN = 1;
56 nw.fW = init_w; 64 nw.fW = init_w;
57 65
58 if (init_w > upperWeight) << 66 if (init_w > upperWeight) {
59 { <<
60 // splitting 67 // splitting
61 // << 68
62 G4double temp_wi_ws = init_w/upperWeight; << 69 G4double wi_ws = init_w/survivalWeight;
63 auto split_i = static_cast<G4int>(temp_wi << 70 G4int int_wi_ws = static_cast<int>(wi_ws);
64 if(split_i != temp_wi_ws) { ++split_i; } <<
65 G4double wi_ws = init_w/split_i; <<
66 71
67 // values in case integer mode or in csae 72 // values in case integer mode or in csae of double
68 // mode and the lower number of splits wil 73 // mode and the lower number of splits will be diced
69 // << 74 nw.fN = int_wi_ws;
70 nw.fN = split_i; << 75 nw.fW = survivalWeight;
71 nw.fW = wi_ws; << 76
72 << 77 if (wi_ws <= fMaxNumberOfSplits) {
73 //TB if (wi_ws <= fMaxNumberOfSplits) { << 78 if (wi_ws > int_wi_ws) {
74 //TB if (wi_ws > int_wi_ws) { << 79 // double mode
75 //TB // double mode << 80 G4double p2 = wi_ws - int_wi_ws;
76 //TB G4double p2 = wi_ws - int_wi_ws; << 81 G4double r = G4UniformRand();
77 //TB G4double r = G4UniformRand(); << 82 if (r<p2) {
78 //TB if (r<p2) { << 83 nw.fN = int_wi_ws + 1;
79 //TB nw.fN = int_wi_ws + 1; << 84 }
80 //TB } << 85 }
81 //TB } << 86 }
82 //TB } << 87 else {
83 //TB else { << 88 // fMaxNumberOfSplits < wi_ws
84 //TB // fMaxNumberOfSplits < wi_ws << 89 nw.fN = fMaxNumberOfSplits;
85 //TB nw.fN = fMaxNumberOfSplits; << 90 nw.fW = init_w/fMaxNumberOfSplits;
86 //TB nw.fW = init_w/fMaxNumberOfSplits; << 91 }
87 //TB } << 92
88 << 93
89 } << 94 } else if (init_w < lowerWeightBound) {
90 else if (init_w < lowerWeightBound) // Russ << 95 // Russian roulette
91 { <<
92 G4double wi_ws = init_w/survivalWeight; 96 G4double wi_ws = init_w/survivalWeight;
93 G4double p = std::max(wi_ws,1./fMaxNumberO 97 G4double p = std::max(wi_ws,1./fMaxNumberOfSplits);
94 G4double r = G4UniformRand(); 98 G4double r = G4UniformRand();
95 if (r<p) << 99 if (r<p){
96 { <<
97 nw.fW = init_w/p; 100 nw.fW = init_w/p;
98 nw.fN = 1; 101 nw.fN = 1;
99 } << 102 } else {
100 else <<
101 { <<
102 nw.fW = 0; 103 nw.fW = 0;
103 nw.fN = 0; 104 nw.fN = 0;
104 } 105 }
105 } 106 }
106 // else do nothing 107 // else do nothing
107 << 108
>> 109
108 return nw; 110 return nw;
109 } 111 }
110 112
111 113