| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer << 3 // * DISCLAIMER *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th << 5 // * The following disclaimer summarizes all the specific disclaimers *
6 // * the Geant4 Collaboration. It is provided << 6 // * of contributors to this software. The specific disclaimers,which *
7 // * conditions of the Geant4 Software License << 7 // * govern, are listed with their locations in: *
8 // * LICENSE and available at http://cern.ch/ << 8 // * http://cern.ch/geant4/license *
9 // * include a list of copyright holders. <<
10 // * 9 // * *
11 // * Neither the authors of this software syst 10 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 11 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 12 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 13 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file << 14 // * use. *
16 // * for the full disclaimer and the limitatio <<
17 // * 15 // * *
18 // * This code implementation is the result << 16 // * This code implementation is the intellectual property of the *
19 // * technical work of the GEANT4 collaboratio << 17 // * GEANT4 collaboration. *
20 // * By using, copying, modifying or distri << 18 // * By copying, distributing or modifying the Program (or any work *
21 // * any work based on the software) you ag << 19 // * based on the Program) you indicate your acceptance of this *
22 // * use in resulting scientific publicati << 20 // * statement, and all its terms. *
23 // * acceptance of all terms of the Geant4 Sof <<
24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4WeightWindowAlgorithm implementation <<
27 // 23 //
28 // Author: Michael Dressel (CERN), 2003 << 24 // $Id: G4WeightWindowAlgorithm.cc,v 1.7 2003/08/19 15:16:56 dressel Exp $
>> 25 // GEANT4 tag $Name: geant4-08-00 $
>> 26 //
>> 27 // ----------------------------------------------------------------------
>> 28 // GEANT 4 class source file
>> 29 //
>> 30 // G4WeightWindowAlgorithm.cc
>> 31 //
29 // ------------------------------------------- 32 // ----------------------------------------------------------------------
30 #include "G4WeightWindowAlgorithm.hh" 33 #include "G4WeightWindowAlgorithm.hh"
31 #include "Randomize.hh" 34 #include "Randomize.hh"
32 35
>> 36
33 G4WeightWindowAlgorithm:: 37 G4WeightWindowAlgorithm::
34 G4WeightWindowAlgorithm(G4double upperLimitFac << 38 G4WeightWindowAlgorithm(G4double upperLimitFaktor,
35 G4double survivalFacto << 39 G4double survivalFaktor,
36 G4int maxNumberOfSplit << 40 G4int maxNumberOfSplits) :
37 : fUpperLimitFactor(upperLimitFactor), << 41 fUpperLimitFaktor(upperLimitFaktor),
38 fSurvivalFactor(survivalFactor), << 42 fSurvivalFaktor(survivalFaktor),
39 fMaxNumberOfSplits(maxNumberOfSplits) << 43 fMaxNumberOfSplits(maxNumberOfSplits)
40 { << 44 {}
41 } << 45
>> 46 G4WeightWindowAlgorithm::~G4WeightWindowAlgorithm()
>> 47 {}
>> 48
42 49
43 G4WeightWindowAlgorithm::~G4WeightWindowAlgori <<
44 50
45 G4Nsplit_Weight 51 G4Nsplit_Weight
46 G4WeightWindowAlgorithm::Calculate(G4double in 52 G4WeightWindowAlgorithm::Calculate(G4double init_w,
47 G4double lo << 53 G4double lowerWeightBound) const {
48 { << 54
49 G4double survivalWeight = lowerWeightBound * << 55 G4double survivalWeight = lowerWeightBound * fSurvivalFaktor;
50 G4double upperWeight = lowerWeightBound * fU << 56 G4double upperWeight = lowerWeightBound * fUpperLimitFaktor;
51 57
52 // initialize return value for case weight i 58 // initialize return value for case weight in window
53 // <<
54 G4Nsplit_Weight nw; 59 G4Nsplit_Weight nw;
55 nw.fN = 1; 60 nw.fN = 1;
56 nw.fW = init_w; 61 nw.fW = init_w;
57 62
58 if (init_w > upperWeight) << 63 if (init_w > upperWeight) {
59 { <<
60 // splitting 64 // splitting
61 // << 65
62 G4double temp_wi_ws = init_w/upperWeight; << 66 G4double wi_ws = init_w/survivalWeight;
63 auto split_i = static_cast<G4int>(temp_wi << 67 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 68
67 // values in case integer mode or in csae 69 // values in case integer mode or in csae of double
68 // mode and the lower number of splits wil 70 // mode and the lower number of splits will be diced
69 // << 71 nw.fN = int_wi_ws;
70 nw.fN = split_i; << 72 nw.fW = survivalWeight;
71 nw.fW = wi_ws; << 73
72 << 74 if (wi_ws <= fMaxNumberOfSplits) {
73 //TB if (wi_ws <= fMaxNumberOfSplits) { << 75 if (wi_ws > int_wi_ws) {
74 //TB if (wi_ws > int_wi_ws) { << 76 // double mode
75 //TB // double mode << 77 G4double p2 = wi_ws - int_wi_ws;
76 //TB G4double p2 = wi_ws - int_wi_ws; << 78 G4double r = G4UniformRand();
77 //TB G4double r = G4UniformRand(); << 79 if (r<p2) {
78 //TB if (r<p2) { << 80 nw.fN = int_wi_ws + 1;
79 //TB nw.fN = int_wi_ws + 1; << 81 }
80 //TB } << 82 }
81 //TB } << 83 }
82 //TB } << 84 else {
83 //TB else { << 85 // fMaxNumberOfSplits < wi_ws
84 //TB // fMaxNumberOfSplits < wi_ws << 86 nw.fN = fMaxNumberOfSplits;
85 //TB nw.fN = fMaxNumberOfSplits; << 87 nw.fW = init_w/fMaxNumberOfSplits;
86 //TB nw.fW = init_w/fMaxNumberOfSplits; << 88 }
87 //TB } << 89
88 << 90
89 } << 91 } else if (init_w < lowerWeightBound) {
90 else if (init_w < lowerWeightBound) // Russ << 92 // Russian roulette
91 { <<
92 G4double wi_ws = init_w/survivalWeight; 93 G4double wi_ws = init_w/survivalWeight;
93 G4double p = std::max(wi_ws,1./fMaxNumberO 94 G4double p = std::max(wi_ws,1./fMaxNumberOfSplits);
94 G4double r = G4UniformRand(); 95 G4double r = G4UniformRand();
95 if (r<p) << 96 if (r<p){
96 { <<
97 nw.fW = init_w/p; 97 nw.fW = init_w/p;
98 nw.fN = 1; 98 nw.fN = 1;
99 } << 99 } else {
100 else <<
101 { <<
102 nw.fW = 0; 100 nw.fW = 0;
103 nw.fN = 0; 101 nw.fN = 0;
104 } 102 }
105 } 103 }
106 // else do nothing 104 // else do nothing
107 << 105
>> 106
108 return nw; 107 return nw;
109 } 108 }
110 109
111 110