1 | // |
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2 | // ******************************************************************** |
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3 | // * License and Disclaimer * |
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4 | // * * |
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5 | // * The Geant4 software is copyright of the Copyright Holders of * |
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6 | // * the Geant4 Collaboration. It is provided under the terms and * |
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7 | // * conditions of the Geant4 Software License, included in the file * |
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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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16 | // * for the full disclaimer and the limitation of liability. * |
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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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22 | // * use in resulting scientific publications, and indicate your * |
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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 | // File name: G4DistributionGenerator |
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27 | // |
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28 | // Author: Maria Grazia Pia (pia@genova.infn.it) |
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29 | // |
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30 | // Creation date: 8 May 1998 |
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31 | // |
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32 | // ------------------------------------------------------------------- |
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33 | |
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34 | #include "globals.hh" |
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35 | #include "G4DistributionGenerator.hh" |
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36 | #include "G4ios.hh" |
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37 | #include <assert.h> |
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38 | |
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39 | // Constructor |
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40 | |
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41 | G4DistributionGenerator::G4DistributionGenerator(std::vector<G4double>& x, |
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42 | std::vector<G4double>& values) |
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43 | |
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44 | { |
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45 | _x = x; |
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46 | |
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47 | // Check boundaries: must be size(x) = size(values) + 1 |
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48 | if (x.size() != (values.size() + 1)) |
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49 | { G4cout << " Inconsistent parameters in G4DistributionGenerator " |
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50 | << G4endl; |
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51 | } |
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52 | assert (x.size() == (values.size() + 1)); |
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53 | |
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54 | G4double tot = 0.; |
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55 | unsigned int i; |
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56 | for (i=0; i<values.size(); i++) { tot += values[i]; } |
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57 | assert (tot > 0.); |
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58 | |
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59 | _cumProb.push_back(0.); |
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60 | // _cumProb.push_back(values[0] / tot); |
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61 | G4double sum = 0.; |
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62 | for (i=0; i<values.size(); i++) |
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63 | { |
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64 | sum += values[i]; |
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65 | _cumProb.push_back(sum / tot); } |
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66 | |
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67 | // Debugging |
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68 | /* |
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69 | for (i=0; i<values.size(); i++) |
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70 | { G4cout << values[i] << " " ; } |
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71 | G4cout << " Integral = " << tot << G4endl; |
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72 | for (i=0; i<_cumProb.size(); i++) |
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73 | { |
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74 | G4cout << "Variable " << _x[i] |
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75 | << " --- cumProb = " << _cumProb[i] << G4endl; |
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76 | } |
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77 | */ |
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78 | // End of debugging |
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79 | |
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80 | } |
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81 | |
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82 | // Destructor |
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83 | |
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84 | G4DistributionGenerator::~G4DistributionGenerator() |
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85 | { |
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86 | } |
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87 | |
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88 | |
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89 | G4double G4DistributionGenerator::Generate(G4double ranflat) |
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90 | { |
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91 | G4double xRandom = _x[0]; |
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92 | |
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93 | G4int bin = _cumProb.size() - 1; |
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94 | unsigned int i; |
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95 | for (i=1; i<_cumProb.size(); i++) |
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96 | { |
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97 | if (ranflat >= _cumProb[i-1] && ranflat < _cumProb[i]) |
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98 | { |
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99 | bin = i - 1; |
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100 | } |
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101 | } |
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102 | |
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103 | if (bin >= 0 && bin < static_cast<G4int>(_cumProb.size()-1) && bin < static_cast<G4int>(_x.size()-1)) |
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104 | { |
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105 | G4double coeff = (ranflat - _cumProb[bin]) * (_x[bin+1] - _x[bin]) / |
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106 | (_cumProb[bin+1] - _cumProb[bin]); |
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107 | xRandom = _x[bin] + coeff; |
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108 | |
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109 | // Deugging |
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110 | /* |
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111 | G4cout << "Random = " << ranflat << " Generated " << xRandom << G4endl; |
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112 | */ |
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113 | // Endo of Debugging |
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114 | |
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115 | } |
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116 | else |
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117 | { |
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118 | // Debugging |
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119 | /* |
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120 | G4cout << "Bin " << bin << " " |
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121 | << _cumProb.size() << " " |
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122 | << _x.size() |
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123 | << G4endl; |
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124 | */ |
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125 | // End of debugging |
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126 | } |
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127 | |
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128 | return xRandom; |
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129 | |
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130 | } |
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131 | |
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132 | |
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