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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
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9 | // * include a list of copyright holders. * |
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10 | // * * |
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11 | // * Neither the authors of this software system, nor their employing * |
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12 | // * institutes,nor the agencies providing financial support for this * |
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13 | // * work make any representation or warranty, express or implied, * |
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14 | // * regarding this software system or assume any liability for its * |
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15 | // * use. Please see the license in the file LICENSE and URL above * |
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17 | // * * |
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18 | // * This code implementation is the result of the scientific and * |
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19 | // * technical work of the GEANT4 collaboration. * |
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20 | // * By using, copying, modifying or distributing the software (or * |
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21 | // * any work based on the software) you agree to acknowledge its * |
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23 | // * acceptance of all terms of the Geant4 Software license. * |
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24 | // ******************************************************************** |
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25 | // |
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26 | // |
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27 | // $Id: G4ImportanceAlgorithm.cc,v 1.14 2006/06/29 18:17:20 gunter Exp $ |
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28 | // GEANT4 tag $Name: geant4-09-02-ref-02 $ |
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29 | // |
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30 | // ---------------------------------------------------------------------- |
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31 | // GEANT 4 class source file |
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32 | // |
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33 | // G4ImportanceAlgorithm.cc |
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34 | // |
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35 | // ---------------------------------------------------------------------- |
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36 | |
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37 | #include "G4Types.hh" |
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38 | #include <sstream> |
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39 | #include "Randomize.hh" |
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40 | |
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41 | #include "G4ImportanceAlgorithm.hh" |
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42 | |
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43 | G4ImportanceAlgorithm::G4ImportanceAlgorithm(): fWorned(false) |
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44 | {} |
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45 | |
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46 | G4ImportanceAlgorithm::~G4ImportanceAlgorithm() |
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47 | { |
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48 | if(fWorned) { |
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49 | G4cout << G4endl; |
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50 | Warning("~G4ImportanceAlgorithm: ipre_over_ipost ! in [0.25, 4] seen"); |
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51 | G4cout << G4endl; |
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52 | } |
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53 | } |
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54 | |
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55 | G4Nsplit_Weight |
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56 | G4ImportanceAlgorithm::Calculate(G4double ipre, |
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57 | G4double ipost, |
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58 | G4double init_w) const |
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59 | { |
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60 | G4Nsplit_Weight nw = {0,0}; |
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61 | if (ipost>0.){ |
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62 | if (!(ipre>0.)){ |
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63 | Error("G4ImportanceAlgorithm::Calculate() - ipre==0."); |
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64 | } |
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65 | G4double ipre_over_ipost = ipre/ipost; |
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66 | if ((ipre_over_ipost<0.25 || ipre_over_ipost> 4) && !fWorned) { |
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67 | std::ostringstream os; |
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68 | os << "Calculate: ipre_over_ipost ! in [0.25, 4]: ipre_over_ipost = " |
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69 | << ipre_over_ipost << '\0' << G4endl; |
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70 | Warning(os.str()); |
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71 | fWorned = true; |
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72 | if (ipre_over_ipost<=0) { |
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73 | Error("G4ImportanceAlgorithm::Calculate() - ipre_over_ipost<=0"); |
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74 | } |
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75 | } |
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76 | if (init_w<=0.) { |
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77 | Error("G4ImportanceAlgorithm::Calculate() - iniitweight<= 0. found"); |
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78 | } |
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79 | |
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80 | // default geometrical splitting |
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81 | // in integer mode |
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82 | // for ipre_over_ipost <= 1 |
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83 | G4double inv = 1./ipre_over_ipost; |
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84 | nw.fN = static_cast<G4int>(inv); |
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85 | nw.fW = init_w * ipre_over_ipost; |
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86 | |
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87 | // geometrical splitting for double mode |
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88 | if (ipre_over_ipost<1) { |
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89 | if ( static_cast<G4double>(nw.fN) != inv) { |
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90 | // double mode |
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91 | // probability p for splitting into n+1 tracks |
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92 | G4double p = inv - nw.fN; |
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93 | // get a random number out of [0,1) |
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94 | G4double r = G4UniformRand(); |
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95 | if (r<p) { |
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96 | nw.fN++; |
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97 | } |
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98 | } |
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99 | } |
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100 | // ipre_over_ipost > 1 |
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101 | // russian roulett |
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102 | else if (ipre_over_ipost>1) { |
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103 | // probabiity for killing track |
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104 | G4double p = 1-inv; |
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105 | // get a random number out of [0,1) |
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106 | G4double r = G4UniformRand(); |
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107 | if (r<p) { |
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108 | // kill track |
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109 | nw.fN = 0; |
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110 | nw.fW = 0; |
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111 | } |
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112 | else { |
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113 | nw.fN = 1; |
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114 | } |
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115 | } |
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116 | } |
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117 | return nw; |
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118 | } |
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119 | |
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120 | void G4ImportanceAlgorithm::Error(const G4String &m) const |
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121 | { |
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122 | G4cerr << "ERROR - G4ImportanceAlgorithm: " << m << G4endl; |
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123 | G4Exception("G4ImportanceAlgorithm::Error()", |
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124 | "FatalException", FatalException, m); |
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125 | } |
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126 | |
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127 | void G4ImportanceAlgorithm::Warning(const G4String &m) const |
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128 | { |
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129 | G4Exception("G4ImportanceAlgorithm::Warning()", |
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130 | "Notification", JustWarning, m); |
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131 | } |
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