Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/models/radioactive_decay/src/G4BetaSpectrumSampler.cc

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 26 ////////////////////////////////////////////////////////////////////////////////
 27 //                                                                            //
 28 //  File:   G4BetaSpectrumSampler.cc                                          //
 29 //  Author: D.H. Wright                                                       //
 30 //  Date:   21 November 2022                                                  //
 31 //  Description: samples a spectrum which is a piece-wise linear function of  //
 32 //               energy. The CDF is calculated by trapezoidal integration     //
 33 //               and within bins the line y = mx + b is sampled.              //
 34 //                                                                            //
 35 ////////////////////////////////////////////////////////////////////////////////
 36 
 37 #include "G4BetaSpectrumSampler.hh"
 38 #include "Randomize.hh"
 39 
 40 G4double G4BetaSpectrumSampler::shoot(const G4int npoints, const G4double* aCDF,
 41                                       const G4double estep)
 42 {
 43   G4double prob = aCDF[npoints - 1]*G4UniformRand();
 44   G4int i = 0;
 45   for (; i<npoints; ++i) { if (prob <= aCDF[i]) { break; } }
 46   const G4double p1 = (i > 0) ? aCDF[i - 1] : aCDF[0];
 47   const G4double p2 = aCDF[i];
 48   const G4double delta = p2 - p1;
 49   const G4double x = (delta > 0.0) ? estep*i - estep*(p2 - prob)/delta : estep*i;
 50   return x;
 51 }
 52 
 53