| 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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