[819] | 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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