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Geant4/global/HEPNumerics/src/G4VGaussianQuadrature.cc

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Differences between /global/HEPNumerics/src/G4VGaussianQuadrature.cc (Version 11.3.0) and /global/HEPNumerics/src/G4VGaussianQuadrature.cc (Version 8.1.p2)


  1 //                                                  1 //
  2 // *******************************************      2 // ********************************************************************
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 19 // * technical work of the GEANT4 collaboratio     19 // * technical work of the GEANT4 collaboration.                      *
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 24 // *******************************************     24 // ********************************************************************
 25 //                                                 25 //
 26 // G4VGaussianQuadrature class implementation  << 
 27 //                                                 26 //
 28 // Author: V.Grichine, 18.04.1997              <<  27 // $Id: G4VGaussianQuadrature.cc,v 1.7 2006/06/29 19:00:23 gunter Exp $
 29 // ------------------------------------------- <<  28 // GEANT4 tag $Name: geant4-08-01-patch-01 $
                                                   >>  29 //
                                                   >>  30 // Implementation file for G4VGaussianQuadrature virtual base class
                                                   >>  31 //
 30                                                    32 
 31 #include "G4VGaussianQuadrature.hh"            << 
 32 #include "G4ios.hh"                                33 #include "G4ios.hh"
 33 #include "globals.hh"                              34 #include "globals.hh"
                                                   >>  35 #include "G4VGaussianQuadrature.hh"
 34                                                    36 
 35 G4VGaussianQuadrature::G4VGaussianQuadrature(f <<  37 G4VGaussianQuadrature::G4VGaussianQuadrature( function pFunction )
 36   : fFunction(pFunction)                       <<  38   : fFunction(pFunction), fAbscissa(0), fWeight(0), fNumber(0)
 37 {}                                             <<  39 {
                                                   >>  40 }
 38                                                    41 
 39 // -------------------------------------------     42 // -------------------------------------------------------------------
 40 //                                                 43 //
 41 // Virtual destructor which deletes dynamicall     44 // Virtual destructor which deletes dynamically allocated memory
 42 //                                                 45 //
 43                                                    46 
 44 G4VGaussianQuadrature::~G4VGaussianQuadrature( <<  47 G4VGaussianQuadrature::~G4VGaussianQuadrature() 
 45 {                                                  48 {
 46   delete[] fAbscissa;                          <<  49    delete[] fAbscissa ;
 47   delete[] fWeight;                            <<  50    delete[] fWeight   ;
 48 }                                                  51 }
 49                                                    52 
 50 // -------------------------- Access functions <<  53 // -------------------------- Access functions ----------------------------------
 51 // ----------------------------------          << 
 52                                                    54 
 53 G4double G4VGaussianQuadrature::GetAbscissa(G4 <<  55 G4double
                                                   >>  56 G4VGaussianQuadrature::GetAbscissa(G4int index) const
 54 {                                                  57 {
 55   return fAbscissa[index];                     <<  58    return fAbscissa[index] ;
 56 }                                                  59 }
 57                                                    60 
 58 G4double G4VGaussianQuadrature::GetWeight(G4in <<  61 G4double
                                                   >>  62 G4VGaussianQuadrature::GetWeight(G4int index) const
 59 {                                                  63 {
 60   return fWeight[index];                       <<  64    return fWeight[index] ;
 61 }                                                  65 }
 62                                                    66 
 63 G4int G4VGaussianQuadrature::GetNumber() const <<  67 G4int G4VGaussianQuadrature::GetNumber() const
                                                   >>  68 {
                                                   >>  69    return fNumber ;
                                                   >>  70 }
 64                                                    71 
 65 // -------------------------------------------     72 // ----------------------------------------------------------------------------
 66 //                                                 73 //
 67 // Auxiliary function which returns the value      74 // Auxiliary function which returns the value of std::log(gamma-function(x))
 68 //                                                 75 //
 69                                                    76 
 70 G4double G4VGaussianQuadrature::GammaLogarithm <<  77 G4double 
                                                   >>  78 G4VGaussianQuadrature::GammaLogarithm(G4double xx)
 71 {                                                  79 {
 72   // Returns the value ln(Gamma(xx) for xx > 0 <<  80 
 73   // xx > 1. For 0 < xx < 1. the reflection fo <<  81 // Returns the value ln(Gamma(xx) for xx > 0.  Full accuracy is obtained for 
 74   // (Adapted from Numerical Recipes in C)     <<  82 // xx > 1. For 0 < xx < 1. the reflection formula (6.1.4) can be used first.
 75                                                <<  83 // (Adapted from Numerical Recipes in C)
 76   static const G4double cof[6] = { 76.18009172 <<  84 
 77                                    24.01409824 <<  85   static G4double cof[6] = { 76.18009172947146,     -86.50532032941677,
 78                                    0.120865097 <<  86                              24.01409824083091,      -1.231739572450155,
 79   G4double x                   = xx - 1.0;     <<  87                               0.1208650973866179e-2, -0.5395239384953e-5  } ;
 80   G4double tmp                 = x + 5.5;      <<  88   G4double x = xx - 1.0;
                                                   >>  89   G4double tmp = x + 5.5;
 81   tmp -= (x + 0.5) * std::log(tmp);                90   tmp -= (x + 0.5) * std::log(tmp);
 82   G4double ser = 1.000000000190015;                91   G4double ser = 1.000000000190015;
 83                                                    92 
 84   for(size_t j = 0; j <= 5; ++j)               <<  93   for ( size_t j = 0; j <= 5; j++ )
 85   {                                                94   {
 86     x += 1.0;                                      95     x += 1.0;
 87     ser += cof[j] / x;                         <<  96     ser += cof[j]/x;
 88   }                                                97   }
 89   return -tmp + std::log(2.5066282746310005 *  <<  98   return -tmp + std::log(2.5066282746310005*ser);
 90 }                                                  99 }
 91                                                   100