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Geant4/geometry/biasing/src/G4ImportanceAlgorithm.cc

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Differences between /geometry/biasing/src/G4ImportanceAlgorithm.cc (Version 11.3.0) and /geometry/biasing/src/G4ImportanceAlgorithm.cc (Version ReleaseNotes)


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  1 //                                                  1 
  2 // *******************************************    
  3 // * License and Disclaimer                       
  4 // *                                              
  5 // * The  Geant4 software  is  copyright of th    
  6 // * the Geant4 Collaboration.  It is provided    
  7 // * conditions of the Geant4 Software License    
  8 // * LICENSE and available at  http://cern.ch/    
  9 // * include a list of copyright holders.         
 10 // *                                              
 11 // * Neither the authors of this software syst    
 12 // * institutes,nor the agencies providing fin    
 13 // * work  make  any representation or  warran    
 14 // * regarding  this  software system or assum    
 15 // * use.  Please see the license in the file     
 16 // * for the full disclaimer and the limitatio    
 17 // *                                              
 18 // * This  code  implementation is the result     
 19 // * technical work of the GEANT4 collaboratio    
 20 // * By using,  copying,  modifying or  distri    
 21 // * any work based  on the software)  you  ag    
 22 // * use  in  resulting  scientific  publicati    
 23 // * acceptance of all terms of the Geant4 Sof    
 24 // *******************************************    
 25 //                                                
 26 // G4ImportanceAlgorithm implementation           
 27 //                                                
 28 // Author: Michael Dressel (CERN), 2002           
 29 // -------------------------------------------    
 30                                                   
 31 #include "G4Types.hh"                             
 32 #include "Randomize.hh"                           
 33 #include "G4Threading.hh"                         
 34 #include "G4AutoLock.hh"                          
 35                                                   
 36 #include "G4ImportanceAlgorithm.hh"               
 37                                                   
 38 #include <sstream>                                
 39                                                   
 40 namespace                                         
 41 {                                                 
 42   G4Mutex ImportanceMutex = G4MUTEX_INITIALIZE    
 43 }                                                 
 44                                                   
 45 G4ImportanceAlgorithm::G4ImportanceAlgorithm()    
 46                                                   
 47 G4ImportanceAlgorithm::~G4ImportanceAlgorithm(    
 48                                                   
 49 G4Nsplit_Weight                                   
 50 G4ImportanceAlgorithm::Calculate(G4double ipre    
 51                                  G4double ipos    
 52                                  G4double init    
 53 {                                                 
 54   G4AutoLock l(&ImportanceMutex);                 
 55   G4Nsplit_Weight nw;                             
 56   if (ipost>0.)                                   
 57   {                                               
 58     if (!(ipre>0.))                               
 59     {                                             
 60       Error("Calculate() - ipre==0.");            
 61     }                                             
 62     G4double ipre_over_ipost = ipre/ipost;        
 63     if ((ipre_over_ipost<0.25 || ipre_over_ipo    
 64     {                                             
 65       std::ostringstream os;                      
 66       os << "Calculate() - ipre_over_ipost ! i    
 67          << "ipre_over_ipost = " << ipre_over_    
 68       Warning(os.str());                          
 69       fWarned = true;                             
 70       if (ipre_over_ipost<=0)                     
 71       {                                           
 72         Error("Calculate() - ipre_over_ipost<=    
 73       }                                           
 74     }                                             
 75     if (init_w<=0.)                               
 76     {                                             
 77       Error("Calculate() - iniitweight<= 0. fo    
 78     }                                             
 79                                                   
 80     // default geometrical splitting              
 81     // in integer mode                            
 82     // for ipre_over_ipost <= 1                   
 83     G4double inv = 1./ipre_over_ipost;            
 84     nw.fN = static_cast<G4int>(inv);              
 85     nw.fW = init_w * ipre_over_ipost;             
 86                                                   
 87     // geometrical splitting for double mode      
 88     if (ipre_over_ipost<1)                        
 89     {                                             
 90       if ( static_cast<G4double>(nw.fN) != inv    
 91       {                                           
 92         // double mode                            
 93         // probability p for splitting into n+    
 94         G4double p = inv - nw.fN;                 
 95         // get a random number out of [0,1)       
 96         G4double r = G4UniformRand();             
 97         if (r<p)                                  
 98         {                                         
 99           ++nw.fN;                                
100         }                                         
101       }                                           
102     }                                             
103     else if (ipre_over_ipost>1)   // russian r    
104     {                                             
105       // probabiity for killing track             
106       G4double p = 1-inv;                         
107       // get a random number out of [0,1)         
108       G4double r = G4UniformRand();               
109       if (r<p)                                    
110       {                                           
111         // kill track                             
112         nw.fN = 0;                                
113         nw.fW = 0;                                
114       }                                           
115       else                                        
116       {                                           
117         nw.fN = 1;                                
118       }                                           
119     }                                             
120   }                                               
121   l.unlock();                                     
122                                                   
123   return nw;                                      
124 }                                                 
125                                                   
126 void G4ImportanceAlgorithm::Error(const G4Stri    
127 {                                                 
128   G4Exception("G4ImportanceAlgorithm::Error()"    
129               "GeomBias0002", FatalException,     
130 }                                                 
131                                                   
132 void G4ImportanceAlgorithm::Warning(const G4St    
133 {                                                 
134   G4Exception("G4ImportanceAlgorithm::Warning(    
135               "GeomBias1001", JustWarning, msg    
136 }                                                 
137