Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/biasing/src/G4WeightWindowAlgorithm.cc

Version: [ ReleaseNotes ] [ 1.0 ] [ 1.1 ] [ 2.0 ] [ 3.0 ] [ 3.1 ] [ 3.2 ] [ 4.0 ] [ 4.0.p1 ] [ 4.0.p2 ] [ 4.1 ] [ 4.1.p1 ] [ 5.0 ] [ 5.0.p1 ] [ 5.1 ] [ 5.1.p1 ] [ 5.2 ] [ 5.2.p1 ] [ 5.2.p2 ] [ 6.0 ] [ 6.0.p1 ] [ 6.1 ] [ 6.2 ] [ 6.2.p1 ] [ 6.2.p2 ] [ 7.0 ] [ 7.0.p1 ] [ 7.1 ] [ 7.1.p1 ] [ 8.0 ] [ 8.0.p1 ] [ 8.1 ] [ 8.1.p1 ] [ 8.1.p2 ] [ 8.2 ] [ 8.2.p1 ] [ 8.3 ] [ 8.3.p1 ] [ 8.3.p2 ] [ 9.0 ] [ 9.0.p1 ] [ 9.0.p2 ] [ 9.1 ] [ 9.1.p1 ] [ 9.1.p2 ] [ 9.1.p3 ] [ 9.2 ] [ 9.2.p1 ] [ 9.2.p2 ] [ 9.2.p3 ] [ 9.2.p4 ] [ 9.3 ] [ 9.3.p1 ] [ 9.3.p2 ] [ 9.4 ] [ 9.4.p1 ] [ 9.4.p2 ] [ 9.4.p3 ] [ 9.4.p4 ] [ 9.5 ] [ 9.5.p1 ] [ 9.5.p2 ] [ 9.6 ] [ 9.6.p1 ] [ 9.6.p2 ] [ 9.6.p3 ] [ 9.6.p4 ] [ 10.0 ] [ 10.0.p1 ] [ 10.0.p2 ] [ 10.0.p3 ] [ 10.0.p4 ] [ 10.1 ] [ 10.1.p1 ] [ 10.1.p2 ] [ 10.1.p3 ] [ 10.2 ] [ 10.2.p1 ] [ 10.2.p2 ] [ 10.2.p3 ] [ 10.3 ] [ 10.3.p1 ] [ 10.3.p2 ] [ 10.3.p3 ] [ 10.4 ] [ 10.4.p1 ] [ 10.4.p2 ] [ 10.4.p3 ] [ 10.5 ] [ 10.5.p1 ] [ 10.6 ] [ 10.6.p1 ] [ 10.6.p2 ] [ 10.6.p3 ] [ 10.7 ] [ 10.7.p1 ] [ 10.7.p2 ] [ 10.7.p3 ] [ 10.7.p4 ] [ 11.0 ] [ 11.0.p1 ] [ 11.0.p2 ] [ 11.0.p3, ] [ 11.0.p4 ] [ 11.1 ] [ 11.1.1 ] [ 11.1.2 ] [ 11.1.3 ] [ 11.2 ] [ 11.2.1 ] [ 11.2.2 ] [ 11.3.0 ]

Diff markup

Differences between /geometry/biasing/src/G4WeightWindowAlgorithm.cc (Version 11.3.0) and /geometry/biasing/src/G4WeightWindowAlgorithm.cc (Version 4.1)


  1 //                                                  1 //
  2 // *******************************************      2 // ********************************************************************
  3 // * License and Disclaimer                    <<   3 // * DISCLAIMER                                                       *
  4 // *                                                4 // *                                                                  *
  5 // * The  Geant4 software  is  copyright of th <<   5 // * The following disclaimer summarizes all the specific disclaimers *
  6 // * the Geant4 Collaboration.  It is provided <<   6 // * of contributors to this software. The specific disclaimers,which *
  7 // * conditions of the Geant4 Software License <<   7 // * govern, are listed with their locations in:                      *
  8 // * LICENSE and available at  http://cern.ch/ <<   8 // *   http://cern.ch/geant4/license                                  *
  9 // * include a list of copyright holders.      << 
 10 // *                                                9 // *                                                                  *
 11 // * Neither the authors of this software syst     10 // * Neither the authors of this software system, nor their employing *
 12 // * institutes,nor the agencies providing fin     11 // * institutes,nor the agencies providing financial support for this *
 13 // * work  make  any representation or  warran     12 // * work  make  any representation or  warranty, express or implied, *
 14 // * regarding  this  software system or assum     13 // * regarding  this  software system or assume any liability for its *
 15 // * use.  Please see the license in the file  <<  14 // * use.                                                             *
 16 // * for the full disclaimer and the limitatio << 
 17 // *                                               15 // *                                                                  *
 18 // * This  code  implementation is the result  <<  16 // * This  code  implementation is the  intellectual property  of the *
 19 // * technical work of the GEANT4 collaboratio <<  17 // * GEANT4 collaboration.                                            *
 20 // * By using,  copying,  modifying or  distri <<  18 // * By copying,  distributing  or modifying the Program (or any work *
 21 // * any work based  on the software)  you  ag <<  19 // * based  on  the Program)  you indicate  your  acceptance of  this *
 22 // * use  in  resulting  scientific  publicati <<  20 // * statement, and all its terms.                                    *
 23 // * acceptance of all terms of the Geant4 Sof << 
 24 // *******************************************     21 // ********************************************************************
 25 //                                                 22 //
 26 // G4WeightWindowAlgorithm implementation      << 
 27 //                                                 23 //
 28 // Author: Michael Dressel (CERN), 2003        <<  24 // $Id: G4WeightWindowAlgorithm.cc,v 1.2 2002/05/31 09:56:09 dressel Exp $
                                                   >>  25 // GEANT4 tag $Name: geant4-04-01 $
                                                   >>  26 //
                                                   >>  27 // ----------------------------------------------------------------------
                                                   >>  28 // GEANT 4 class source file
                                                   >>  29 //
                                                   >>  30 // G4WeightWindowAlgorithm.cc
                                                   >>  31 //
 29 // -------------------------------------------     32 // ----------------------------------------------------------------------
 30 #include "G4WeightWindowAlgorithm.hh"              33 #include "G4WeightWindowAlgorithm.hh"
 31 #include "Randomize.hh"                            34 #include "Randomize.hh"
 32                                                    35 
 33 G4WeightWindowAlgorithm::                      <<  36 
 34 G4WeightWindowAlgorithm(G4double upperLimitFac <<  37 G4WeightWindowAlgorithm::G4WeightWindowAlgorithm() :
 35                         G4double survivalFacto <<  38   fUpper(1),
 36                         G4int maxNumberOfSplit <<  39   fLower(1)
 37   : fUpperLimitFactor(upperLimitFactor),       <<  40 {}
 38     fSurvivalFactor(survivalFactor),           <<  41 
 39     fMaxNumberOfSplits(maxNumberOfSplits)      <<  42 void G4WeightWindowAlgorithm::SetUpperLimit(G4double Upper){
 40 {                                              <<  43   fUpper = Upper;
                                                   >>  44 }
                                                   >>  45   
                                                   >>  46 void G4WeightWindowAlgorithm::SetLowerLimit(G4double Lower){
                                                   >>  47   fLower = Lower;
 41 }                                                  48 }
 42                                                    49 
 43 G4WeightWindowAlgorithm::~G4WeightWindowAlgori << 
 44                                                    50 
 45 G4Nsplit_Weight                                    51 G4Nsplit_Weight 
 46 G4WeightWindowAlgorithm::Calculate(G4double in <<  52 G4WeightWindowAlgorithm::Calculate(G4double init_w, 
 47                                    G4double lo <<  53            G4double importance) const {
 48 {                                              <<  54 
 49   G4double survivalWeight = lowerWeightBound * <<  55 
 50   G4double upperWeight = lowerWeightBound * fU <<  56   G4Nsplit_Weight nw(1, init_w);
 51                                                <<  57   G4double iw =  importance * init_w;
 52   // initialize return value for case weight i <<  58   if (iw>fUpper) {
 53   //                                           <<  59     // f is the factor by which the weight is greater 
 54   G4Nsplit_Weight nw;                          <<  60     // than allowed by fUpper
 55   nw.fN = 1;                                   <<  61     // it is almost the number of coppies to be produced
 56   nw.fW = init_w;                              <<  62     G4double f = iw / fUpper;
 57                                                <<  63     // calculate new weight
 58   if (init_w > upperWeight)                    <<  64     nw.fW/=f; 
 59   {                                            <<  65 
 60     // splitting                               <<  66     // calculate the number of coppies
 61     //                                         <<  67     nw.fN = int(f);
 62     G4double temp_wi_ws = init_w/upperWeight;  <<  68     // correct the number of coppies in case f is not an integer
 63     auto  split_i = static_cast<G4int>(temp_wi <<  69     if (G4double(nw.fN) != f) {
 64     if(split_i != temp_wi_ws)  { ++split_i; }  <<  70       // probabillity p for splitting into nw.fN+1 particles
 65     G4double wi_ws = init_w/split_i;           <<  71       G4double p = f - nw.fN;
 66                                                <<  72       // get a random number out of [0,1)
 67     // values in case integer mode or in csae  <<  73       G4double r = G4UniformRand();
 68     // mode and the lower number of splits wil <<  74       if (r<p) {
 69     //                                         <<  75   nw.fN++;
 70     nw.fN = split_i;                           <<  76       } 
 71     nw.fW = wi_ws;                             <<  77     }
 72                                                << 
 73 //TB     if (wi_ws <= fMaxNumberOfSplits) {    << 
 74 //TB       if (wi_ws > int_wi_ws) {            << 
 75 //TB         // double mode                    << 
 76 //TB         G4double p2 =  wi_ws - int_wi_ws; << 
 77 //TB         G4double r = G4UniformRand();     << 
 78 //TB         if (r<p2) {                       << 
 79 //TB           nw.fN = int_wi_ws + 1;          << 
 80 //TB         }                                 << 
 81 //TB       }                                   << 
 82 //TB     }                                     << 
 83 //TB     else {                                << 
 84 //TB       // fMaxNumberOfSplits < wi_ws       << 
 85 //TB       nw.fN = fMaxNumberOfSplits;         << 
 86 //TB       nw.fW = init_w/fMaxNumberOfSplits;  << 
 87 //TB     }                                     << 
 88                                                    78 
 89   }                                                79   }
 90   else if (init_w < lowerWeightBound)  // Russ <<  80   else if (iw < fLower) {
 91   {                                            <<  81     // play russian roulett
 92     G4double wi_ws = init_w/survivalWeight;    <<  82     G4double p = iw / fLower; // survival prob.
 93     G4double p = std::max(wi_ws,1./fMaxNumberO << 
 94     G4double r = G4UniformRand();                  83     G4double r = G4UniformRand();
 95     if (r<p)                                   <<  84     if (r>=p) {
 96     {                                          <<  85       // kill track
 97       nw.fW = init_w/p;                        << 
 98       nw.fN = 1;                               << 
 99     }                                          << 
100     else                                       << 
101     {                                          << 
102       nw.fW = 0;                               << 
103       nw.fN = 0;                                   86       nw.fN = 0;
104     }                                          <<  87       nw.fW = 0;
105   }                                            <<  88     } 
106   // else do nothing                           <<  89     else {
107                                                <<  90       nw.fW*=1/p; // to be consistant with the survival prob.
                                                   >>  91     }      
                                                   >>  92   }
108   return nw;                                       93   return nw;
109 }                                                  94 }
110                                                    95 
111                                                    96