[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 | // |
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[1192] | 27 | // $Id: G4EMDataSet.cc,v 1.20 2009/09/25 07:41:34 sincerti Exp $ |
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[1228] | 28 | // GEANT4 tag $Name: geant4-09-03 $ |
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[819] | 29 | // |
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| 30 | // Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch) |
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| 31 | // |
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| 32 | // History: |
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| 33 | // ----------- |
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| 34 | // 31 Jul 2001 MGP Created |
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| 35 | // |
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[1192] | 36 | // 15 Jul 2009 Nicolas A. Karakatsanis |
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| 37 | // |
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| 38 | // - New Constructor was added when logarithmic data are loaded as well |
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| 39 | // to enhance CPU performance |
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| 40 | // |
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| 41 | // - Destructor was modified accordingly |
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| 42 | // |
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| 43 | // - LoadNonLogData method was created to load only the non-logarithmic data from G4EMLOW |
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| 44 | // dataset. It is essentially performing the data loading operations as in the past. |
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| 45 | // |
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| 46 | // - LoadData method was revised in order to calculate the logarithmic values of the data |
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| 47 | // It retrieves the data values from the G4EMLOW data files but, then, calculates the |
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| 48 | // respective log values and loads them to seperate data structures. |
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| 49 | // |
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| 50 | // - SetLogEnergiesData method was cretaed to set logarithmic values to G4 data vectors. |
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| 51 | // The EM data sets, initialized this way, contain both non-log and log values. |
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| 52 | // These initialized data sets can enhance the computing performance of data interpolation |
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| 53 | // operations |
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| 54 | // |
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| 55 | // |
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[819] | 56 | // ------------------------------------------------------------------- |
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| 57 | |
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| 58 | #include "G4EMDataSet.hh" |
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| 59 | #include "G4VDataSetAlgorithm.hh" |
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| 60 | #include <fstream> |
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| 61 | #include <sstream> |
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[961] | 62 | #include "G4Integrator.hh" |
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| 63 | #include "Randomize.hh" |
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| 64 | #include "G4LinInterpolation.hh" |
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[819] | 65 | |
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[961] | 66 | |
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| 67 | G4EMDataSet::G4EMDataSet(G4int Z, |
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| 68 | G4VDataSetAlgorithm* algo, |
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| 69 | G4double xUnit, |
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| 70 | G4double yUnit, |
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| 71 | G4bool random): |
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| 72 | z(Z), |
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| 73 | energies(0), |
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| 74 | data(0), |
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[1192] | 75 | log_energies(0), |
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| 76 | log_data(0), |
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[961] | 77 | algorithm(algo), |
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| 78 | unitEnergies(xUnit), |
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| 79 | unitData(yUnit), |
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| 80 | pdf(0), |
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| 81 | randomSet(random) |
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[819] | 82 | { |
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[961] | 83 | if (algorithm == 0) G4Exception("G4EMDataSet::G4EMDataSet - interpolation == 0"); |
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| 84 | if (randomSet) BuildPdf(); |
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[819] | 85 | } |
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| 86 | |
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[961] | 87 | G4EMDataSet::G4EMDataSet(G4int argZ, |
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| 88 | G4DataVector* dataX, |
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| 89 | G4DataVector* dataY, |
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| 90 | G4VDataSetAlgorithm* algo, |
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| 91 | G4double xUnit, |
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| 92 | G4double yUnit, |
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| 93 | G4bool random): |
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| 94 | z(argZ), |
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| 95 | energies(dataX), |
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| 96 | data(dataY), |
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[1192] | 97 | log_energies(0), |
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| 98 | log_data(0), |
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[961] | 99 | algorithm(algo), |
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| 100 | unitEnergies(xUnit), |
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| 101 | unitData(yUnit), |
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| 102 | pdf(0), |
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| 103 | randomSet(random) |
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[819] | 104 | { |
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[961] | 105 | if (algorithm == 0) G4Exception("G4EMDataSet::G4EMDataSet - interpolation == 0"); |
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[819] | 106 | |
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[961] | 107 | if ((energies == 0) ^ (data == 0)) |
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| 108 | G4Exception("G4EMDataSet::G4EMDataSet - different size for energies and data (zero case)"); |
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[819] | 109 | |
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[961] | 110 | if (energies == 0) return; |
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[819] | 111 | |
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[961] | 112 | if (energies->size() != data->size()) |
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| 113 | G4Exception("G4EMDataSet::G4EMDataSet - different size for energies and data"); |
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| 114 | |
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| 115 | if (randomSet) BuildPdf(); |
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[819] | 116 | } |
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| 117 | |
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[1192] | 118 | G4EMDataSet::G4EMDataSet(G4int argZ, |
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| 119 | G4DataVector* dataX, |
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| 120 | G4DataVector* dataY, |
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| 121 | G4DataVector* dataLogX, |
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| 122 | G4DataVector* dataLogY, |
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| 123 | G4VDataSetAlgorithm* algo, |
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| 124 | G4double xUnit, |
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| 125 | G4double yUnit, |
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| 126 | G4bool random): |
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| 127 | z(argZ), |
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| 128 | energies(dataX), |
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| 129 | data(dataY), |
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| 130 | log_energies(dataLogX), |
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| 131 | log_data(dataLogY), |
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| 132 | algorithm(algo), |
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| 133 | unitEnergies(xUnit), |
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| 134 | unitData(yUnit), |
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| 135 | pdf(0), |
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| 136 | randomSet(random) |
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| 137 | { |
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| 138 | if (algorithm == 0) G4Exception("G4EMDataSet::G4EMDataSet - interpolation == 0"); |
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| 139 | |
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| 140 | if ((energies == 0) ^ (data == 0)) |
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| 141 | G4Exception("G4EMDataSet::G4EMDataSet - different size for energies and data (zero case)"); |
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| 142 | |
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| 143 | if (energies == 0) return; |
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| 144 | |
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| 145 | if (energies->size() != data->size()) |
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| 146 | G4Exception("G4EMDataSet::G4EMDataSet - different size for energies and data"); |
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| 147 | |
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| 148 | if ((log_energies == 0) ^ (log_data == 0)) |
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| 149 | G4Exception("G4EMDataSet::G4EMDataSet - different size for log energies and log data (zero case)"); |
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| 150 | |
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| 151 | if (log_energies == 0) return; |
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| 152 | |
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| 153 | if (log_energies->size() != log_data->size()) |
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| 154 | G4Exception("G4EMDataSet::G4EMDataSet - different size for log energies and log data"); |
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| 155 | |
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| 156 | if (randomSet) BuildPdf(); |
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| 157 | } |
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| 158 | |
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| 159 | |
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[961] | 160 | G4EMDataSet::~G4EMDataSet() |
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[819] | 161 | { |
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[961] | 162 | delete algorithm; |
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| 163 | if (energies) delete energies; |
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| 164 | if (data) delete data; |
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| 165 | if (pdf) delete pdf; |
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[1192] | 166 | if (log_energies) delete log_energies; |
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| 167 | if (log_data) delete log_data; |
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[819] | 168 | } |
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| 169 | |
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[1192] | 170 | |
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[961] | 171 | G4double G4EMDataSet::FindValue(G4double energy, G4int /* componentId */) const |
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| 172 | { |
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| 173 | if (!energies) G4Exception("G4EMDataSet::FindValue - energies == 0"); |
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| 174 | if (energies->empty()) return 0; |
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| 175 | if (energy <= (*energies)[0]) return (*data)[0]; |
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[819] | 176 | |
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[961] | 177 | size_t i = energies->size()-1; |
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| 178 | if (energy >= (*energies)[i]) return (*data)[i]; |
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[819] | 179 | |
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[1192] | 180 | //Nicolas A. Karakatsanis: Check if the logarithmic data have been loaded to decide |
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| 181 | // which Interpolation-Calculation method will be applied |
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| 182 | if (log_energies != 0) |
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| 183 | { |
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| 184 | return algorithm->Calculate(energy, FindLowerBound(energy), *energies, *data, *log_energies, *log_data); |
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| 185 | } |
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| 186 | |
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[961] | 187 | return algorithm->Calculate(energy, FindLowerBound(energy), *energies, *data); |
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| 188 | } |
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[819] | 189 | |
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| 190 | |
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[961] | 191 | void G4EMDataSet::PrintData(void) const |
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[819] | 192 | { |
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[961] | 193 | if (!energies) |
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| 194 | { |
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| 195 | G4cout << "Data not available." << G4endl; |
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| 196 | } |
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| 197 | else |
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| 198 | { |
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| 199 | size_t size = energies->size(); |
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| 200 | for (size_t i(0); i<size; i++) |
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| 201 | { |
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| 202 | G4cout << "Point: " << ((*energies)[i]/unitEnergies) |
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| 203 | << " - Data value: " << ((*data)[i]/unitData); |
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| 204 | if (pdf != 0) G4cout << " - PDF : " << (*pdf)[i]; |
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| 205 | G4cout << G4endl; |
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| 206 | } |
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| 207 | } |
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| 208 | } |
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[819] | 209 | |
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| 210 | |
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[961] | 211 | void G4EMDataSet::SetEnergiesData(G4DataVector* dataX, |
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| 212 | G4DataVector* dataY, |
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| 213 | G4int /* componentId */) |
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| 214 | { |
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| 215 | if (energies) delete energies; |
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| 216 | energies = dataX; |
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[819] | 217 | |
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[961] | 218 | if (data) delete data; |
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| 219 | data = dataY; |
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| 220 | |
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| 221 | if ((energies == 0) ^ (data==0)) |
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| 222 | G4Exception("G4EMDataSet::SetEnergiesData - different size for energies and data (zero case)"); |
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[819] | 223 | |
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[961] | 224 | if (energies == 0) return; |
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[1192] | 225 | |
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| 226 | //G4cout << "Size of energies: " << energies->size() << G4endl << "Size of data: " << data->size() << G4endl; |
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[961] | 227 | if (energies->size() != data->size()) |
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| 228 | G4Exception("G4EMDataSet::SetEnergiesData - different size for energies and data"); |
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[819] | 229 | } |
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| 230 | |
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[1192] | 231 | void G4EMDataSet::SetLogEnergiesData(G4DataVector* dataX, |
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| 232 | G4DataVector* dataY, |
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| 233 | G4DataVector* data_logX, |
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| 234 | G4DataVector* data_logY, |
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| 235 | G4int /* componentId */) |
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| 236 | { |
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| 237 | //Load of the actual energy and data values |
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| 238 | if (energies) delete energies; |
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| 239 | energies = dataX; |
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| 240 | if (data) delete data; |
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| 241 | data = dataY; |
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| 242 | |
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| 243 | //Check if data loaded properly from data files |
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| 244 | if ((energies == 0) ^ (data==0)) |
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| 245 | G4Exception("G4EMDataSet::SetLogEnergiesData - different size for energies and data (zero case)"); |
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| 246 | |
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| 247 | if (energies == 0) return; |
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| 248 | |
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| 249 | //G4cout << "Size of energies: " << energies->size() << G4endl << "Size of data: " << data->size() << G4endl << G4endl; |
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| 250 | if (energies->size() != data->size()) |
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| 251 | G4Exception("G4EMDataSet::SetLogEnergiesData - different size for energies and data"); |
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| 252 | |
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| 253 | //Load of the logarithmic energy and data values |
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| 254 | if (log_energies) delete log_energies; |
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| 255 | log_energies = data_logX; |
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| 256 | if (log_data) delete log_data; |
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| 257 | log_data = data_logY; |
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| 258 | |
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| 259 | //Check if logarithmic data loaded properly from data files |
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| 260 | if ((log_energies == 0) ^ (log_data==0)) |
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| 261 | G4Exception("G4EMDataSet::SetLogEnergiesData - different size for log energies and log data (zero case)"); |
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| 262 | |
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| 263 | if (log_energies == 0) G4cout << "G4EMDataSet::SetLogEnergiesData - log_energies == 0" << G4endl; |
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| 264 | if (log_energies == 0) return; |
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| 265 | |
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| 266 | //G4cout << "Size of log energies: " << log_energies->size() << G4endl << "Size of log data: " << log_data->size() << G4endl << G4endl; |
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| 267 | if (log_energies->size() != log_data->size()) |
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| 268 | G4Exception("G4EMDataSet::SetLogEnergiesData - different size for log energies and log data"); |
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| 269 | } |
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| 270 | |
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| 271 | |
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| 272 | |
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[961] | 273 | G4bool G4EMDataSet::LoadData(const G4String& fileName) |
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| 274 | { |
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[1192] | 275 | // The file is organized into four columns: |
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| 276 | // 1st column contains the values of energy |
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| 277 | // 2nd column contains the corresponding data value |
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| 278 | // The file terminates with the pattern: -1 -1 |
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| 279 | // -2 -2 |
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| 280 | |
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[961] | 281 | G4String fullFileName(FullFileName(fileName)); |
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| 282 | std::ifstream in(fullFileName); |
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[819] | 283 | |
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[961] | 284 | if (!in.is_open()) |
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| 285 | { |
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| 286 | G4String message("G4EMDataSet::LoadData - data file \""); |
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| 287 | message += fullFileName; |
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| 288 | message += "\" not found"; |
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| 289 | G4Exception(message); |
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| 290 | } |
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[819] | 291 | |
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[961] | 292 | G4DataVector* argEnergies=new G4DataVector; |
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| 293 | G4DataVector* argData=new G4DataVector; |
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[1192] | 294 | G4DataVector* argLogEnergies=new G4DataVector; |
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| 295 | G4DataVector* argLogData=new G4DataVector; |
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[819] | 296 | |
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[961] | 297 | G4double a; |
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[1192] | 298 | G4int k = 0; |
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| 299 | G4int nColumns = 2; |
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[819] | 300 | |
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[961] | 301 | do |
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| 302 | { |
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| 303 | in >> a; |
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[1192] | 304 | |
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| 305 | if (a==0.) a=1e-300; |
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[819] | 306 | |
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[1192] | 307 | if (a != -1 && a != -2) |
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[961] | 308 | { |
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[1192] | 309 | if (k%nColumns == 0) |
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| 310 | { |
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| 311 | argEnergies->push_back(a*unitEnergies); |
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| 312 | argLogEnergies->push_back(std::log10(a)+std::log10(unitEnergies)); |
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| 313 | } |
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| 314 | else if (k%nColumns == 1) |
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| 315 | { |
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| 316 | argData->push_back(a*unitData); |
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| 317 | argLogData->push_back(std::log10(a)+std::log10(unitData)); |
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| 318 | } |
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| 319 | k++; |
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[961] | 320 | } |
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| 321 | } |
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| 322 | while (a != -2); |
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[1192] | 323 | |
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| 324 | |
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| 325 | SetLogEnergiesData(argEnergies, argData, argLogEnergies, argLogData, 0); |
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| 326 | |
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| 327 | if (randomSet) BuildPdf(); |
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[819] | 328 | |
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[1192] | 329 | return true; |
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| 330 | } |
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| 331 | |
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| 332 | |
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| 333 | G4bool G4EMDataSet::LoadNonLogData(const G4String& fileName) |
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| 334 | { |
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| 335 | // The file is organized into four columns: |
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| 336 | // 1st column contains the values of energy |
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| 337 | // 2nd column contains the corresponding data value |
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| 338 | // The file terminates with the pattern: -1 -1 |
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| 339 | // -2 -2 |
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| 340 | |
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| 341 | G4String fullFileName(FullFileName(fileName)); |
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| 342 | std::ifstream in(fullFileName); |
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| 343 | if (!in.is_open()) |
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| 344 | { |
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| 345 | G4String message("G4EMDataSet::LoadData - data file \""); |
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| 346 | message += fullFileName; |
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| 347 | message += "\" not found"; |
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| 348 | G4Exception(message); |
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| 349 | } |
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| 350 | |
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| 351 | G4DataVector* argEnergies=new G4DataVector; |
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| 352 | G4DataVector* argData=new G4DataVector; |
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| 353 | |
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| 354 | G4double a; |
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| 355 | G4int k = 0; |
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| 356 | G4int nColumns = 2; |
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| 357 | |
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| 358 | do |
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| 359 | { |
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| 360 | in >> a; |
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| 361 | |
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| 362 | if (a != -1 && a != -2) |
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| 363 | { |
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| 364 | if (k%nColumns == 0) |
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| 365 | { |
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| 366 | argEnergies->push_back(a*unitEnergies); |
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| 367 | } |
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| 368 | else if (k%nColumns == 1) |
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| 369 | { |
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| 370 | argData->push_back(a*unitData); |
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| 371 | } |
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| 372 | k++; |
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| 373 | } |
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| 374 | } |
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| 375 | while (a != -2); |
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| 376 | |
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[961] | 377 | SetEnergiesData(argEnergies, argData, 0); |
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[1192] | 378 | |
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[961] | 379 | if (randomSet) BuildPdf(); |
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| 380 | |
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| 381 | return true; |
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[819] | 382 | } |
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| 383 | |
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[1192] | 384 | |
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| 385 | |
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[961] | 386 | G4bool G4EMDataSet::SaveData(const G4String& name) const |
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| 387 | { |
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| 388 | // The file is organized into two columns: |
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| 389 | // 1st column is the energy |
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| 390 | // 2nd column is the corresponding value |
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| 391 | // The file terminates with the pattern: -1 -1 |
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| 392 | // -2 -2 |
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| 393 | |
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| 394 | G4String fullFileName(FullFileName(name)); |
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| 395 | std::ofstream out(fullFileName); |
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[819] | 396 | |
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[961] | 397 | if (!out.is_open()) |
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| 398 | { |
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| 399 | G4String message("G4EMDataSet::SaveData - cannot open \""); |
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| 400 | message+=fullFileName; |
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| 401 | message+="\""; |
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| 402 | G4Exception(message); |
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| 403 | } |
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| 404 | |
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| 405 | out.precision(10); |
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| 406 | out.width(15); |
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| 407 | out.setf(std::ofstream::left); |
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| 408 | |
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| 409 | if (energies!=0 && data!=0) |
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| 410 | { |
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| 411 | G4DataVector::const_iterator i(energies->begin()); |
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| 412 | G4DataVector::const_iterator endI(energies->end()); |
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| 413 | G4DataVector::const_iterator j(data->begin()); |
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| 414 | |
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| 415 | while (i!=endI) |
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| 416 | { |
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| 417 | out.precision(10); |
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| 418 | out.width(15); |
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| 419 | out.setf(std::ofstream::left); |
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| 420 | out << ((*i)/unitEnergies) << ' '; |
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[819] | 421 | |
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[961] | 422 | out.precision(10); |
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| 423 | out.width(15); |
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| 424 | out.setf(std::ofstream::left); |
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| 425 | out << ((*j)/unitData) << std::endl; |
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[819] | 426 | |
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[961] | 427 | i++; |
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| 428 | j++; |
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| 429 | } |
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| 430 | } |
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[819] | 431 | |
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[961] | 432 | out.precision(10); |
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| 433 | out.width(15); |
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| 434 | out.setf(std::ofstream::left); |
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| 435 | out << -1.f << ' '; |
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[819] | 436 | |
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[961] | 437 | out.precision(10); |
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| 438 | out.width(15); |
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| 439 | out.setf(std::ofstream::left); |
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| 440 | out << -1.f << std::endl; |
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[819] | 441 | |
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[961] | 442 | out.precision(10); |
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| 443 | out.width(15); |
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| 444 | out.setf(std::ofstream::left); |
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| 445 | out << -2.f << ' '; |
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[819] | 446 | |
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[961] | 447 | out.precision(10); |
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| 448 | out.width(15); |
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| 449 | out.setf(std::ofstream::left); |
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| 450 | out << -2.f << std::endl; |
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[819] | 451 | |
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[961] | 452 | return true; |
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| 453 | } |
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[819] | 454 | |
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[1192] | 455 | |
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| 456 | |
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[961] | 457 | size_t G4EMDataSet::FindLowerBound(G4double x) const |
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[819] | 458 | { |
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[961] | 459 | size_t lowerBound = 0; |
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| 460 | size_t upperBound(energies->size() - 1); |
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| 461 | |
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| 462 | while (lowerBound <= upperBound) |
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| 463 | { |
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| 464 | size_t midBin((lowerBound + upperBound) / 2); |
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[819] | 465 | |
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[961] | 466 | if (x < (*energies)[midBin]) upperBound = midBin - 1; |
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| 467 | else lowerBound = midBin + 1; |
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| 468 | } |
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| 469 | |
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| 470 | return upperBound; |
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| 471 | } |
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[819] | 472 | |
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| 473 | |
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[961] | 474 | size_t G4EMDataSet::FindLowerBound(G4double x, G4DataVector* values) const |
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| 475 | { |
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| 476 | size_t lowerBound = 0;; |
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| 477 | size_t upperBound(values->size() - 1); |
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| 478 | |
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| 479 | while (lowerBound <= upperBound) |
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| 480 | { |
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| 481 | size_t midBin((lowerBound + upperBound) / 2); |
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[819] | 482 | |
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[961] | 483 | if (x < (*values)[midBin]) upperBound = midBin - 1; |
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| 484 | else lowerBound = midBin + 1; |
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| 485 | } |
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[819] | 486 | |
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[961] | 487 | return upperBound; |
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[819] | 488 | } |
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| 489 | |
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| 490 | |
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[961] | 491 | G4String G4EMDataSet::FullFileName(const G4String& name) const |
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[819] | 492 | { |
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[961] | 493 | char* path = getenv("G4LEDATA"); |
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| 494 | if (!path) |
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| 495 | G4Exception("G4EMDataSet::FullFileName - G4LEDATA environment variable not set"); |
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[819] | 496 | |
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[961] | 497 | std::ostringstream fullFileName; |
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| 498 | fullFileName << path << '/' << name << z << ".dat"; |
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| 499 | |
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| 500 | return G4String(fullFileName.str().c_str()); |
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| 501 | } |
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[819] | 502 | |
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| 503 | |
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[1192] | 504 | |
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[961] | 505 | void G4EMDataSet::BuildPdf() |
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| 506 | { |
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| 507 | pdf = new G4DataVector; |
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| 508 | G4Integrator <G4EMDataSet, G4double(G4EMDataSet::*)(G4double)> integrator; |
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[819] | 509 | |
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[961] | 510 | G4int nData = data->size(); |
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| 511 | pdf->push_back(0.); |
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[819] | 512 | |
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[961] | 513 | // Integrate the data distribution |
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| 514 | G4int i; |
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| 515 | G4double totalSum = 0.; |
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| 516 | for (i=1; i<nData; i++) |
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| 517 | { |
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| 518 | G4double xLow = (*energies)[i-1]; |
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| 519 | G4double xHigh = (*energies)[i]; |
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| 520 | G4double sum = integrator.Legendre96(this, &G4EMDataSet::IntegrationFunction, xLow, xHigh); |
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| 521 | totalSum = totalSum + sum; |
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| 522 | pdf->push_back(totalSum); |
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| 523 | } |
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[819] | 524 | |
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[961] | 525 | // Normalize to the last bin |
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| 526 | G4double tot = 0.; |
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| 527 | if (totalSum > 0.) tot = 1. / totalSum; |
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| 528 | for (i=1; i<nData; i++) |
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| 529 | { |
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| 530 | (*pdf)[i] = (*pdf)[i] * tot; |
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| 531 | } |
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[819] | 532 | } |
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| 533 | |
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| 534 | |
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[961] | 535 | G4double G4EMDataSet::RandomSelect(G4int /* componentId */) const |
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| 536 | { |
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| 537 | // Random select a X value according to the cumulative probability distribution |
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| 538 | // derived from the data |
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[819] | 539 | |
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[961] | 540 | if (!pdf) G4Exception("G4EMDataSet::RandomSelect - PDF has not been created for this data set"); |
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[819] | 541 | |
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[961] | 542 | G4double value = 0.; |
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| 543 | G4double x = G4UniformRand(); |
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[819] | 544 | |
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[961] | 545 | // Locate the random value in the X vector based on the PDF |
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| 546 | size_t bin = FindLowerBound(x,pdf); |
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[819] | 547 | |
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[961] | 548 | // Interpolate the PDF to calculate the X value: |
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| 549 | // linear interpolation in the first bin (to avoid problem with 0), |
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| 550 | // interpolation with associated data set algorithm in other bins |
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| 551 | |
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| 552 | G4LinInterpolation linearAlgo; |
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| 553 | if (bin == 0) value = linearAlgo.Calculate(x, bin, *pdf, *energies); |
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| 554 | else value = algorithm->Calculate(x, bin, *pdf, *energies); |
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| 555 | |
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| 556 | // G4cout << x << " random bin "<< bin << " - " << value << G4endl; |
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| 557 | return value; |
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[819] | 558 | } |
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| 559 | |
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[961] | 560 | G4double G4EMDataSet::IntegrationFunction(G4double x) |
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| 561 | { |
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| 562 | // This function is needed by G4Integrator to calculate the integral of the data distribution |
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[819] | 563 | |
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[961] | 564 | G4double y = 0; |
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[819] | 565 | |
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[961] | 566 | // Locate the random value in the X vector based on the PDF |
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| 567 | size_t bin = FindLowerBound(x); |
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[819] | 568 | |
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[961] | 569 | // Interpolate to calculate the X value: |
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| 570 | // linear interpolation in the first bin (to avoid problem with 0), |
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| 571 | // interpolation with associated algorithm in other bins |
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[819] | 572 | |
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[961] | 573 | G4LinInterpolation linearAlgo; |
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[819] | 574 | |
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[961] | 575 | if (bin == 0) y = linearAlgo.Calculate(x, bin, *energies, *data); |
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| 576 | else y = algorithm->Calculate(x, bin, *energies, *data); |
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[819] | 577 | |
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[961] | 578 | return y; |
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[819] | 579 | } |
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[961] | 580 | |
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