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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 7.0.p1)


  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 // G4VGaussianQuadrature class implementation  << 
 27 //                                                 23 //
 28 // Author: V.Grichine, 18.04.1997              <<  24 // $Id: G4VGaussianQuadrature.cc,v 1.5 2004/11/12 17:38:33 gcosmo Exp $
 29 // ------------------------------------------- <<  25 // GEANT4 tag $Name: geant4-07-00-patch-01 $
                                                   >>  26 //
                                                   >>  27 // Implementation file for G4VGaussianQuadrature virtual base class
                                                   >>  28 //
 30                                                    29 
 31 #include "G4VGaussianQuadrature.hh"            << 
 32 #include "G4ios.hh"                                30 #include "G4ios.hh"
 33 #include "globals.hh"                              31 #include "globals.hh"
                                                   >>  32 #include "G4VGaussianQuadrature.hh"
 34                                                    33 
 35 G4VGaussianQuadrature::G4VGaussianQuadrature(f <<  34 
 36   : fFunction(pFunction)                       <<  35 
 37 {}                                             <<  36 
                                                   >>  37 G4VGaussianQuadrature::G4VGaussianQuadrature( function pFunction )
                                                   >>  38 {
                                                   >>  39    fFunction = pFunction ;
                                                   >>  40    fAbscissa = 0;
                                                   >>  41    fWeight = 0;
                                                   >>  42 }
 38                                                    43 
 39 // -------------------------------------------     44 // -------------------------------------------------------------------
 40 //                                                 45 //
 41 // Virtual destructor which deletes dynamicall     46 // Virtual destructor which deletes dynamically allocated memory
 42 //                                                 47 //
 43                                                    48 
 44 G4VGaussianQuadrature::~G4VGaussianQuadrature( <<  49 G4VGaussianQuadrature::~G4VGaussianQuadrature() 
 45 {                                                  50 {
 46   delete[] fAbscissa;                          <<  51    delete[] fAbscissa ;
 47   delete[] fWeight;                            <<  52    delete[] fWeight   ;
 48 }                                                  53 }
 49                                                    54 
 50 // -------------------------- Access functions <<  55 // -------------------------- Access functions ----------------------------------
 51 // ----------------------------------          <<  56 
 52                                                    57 
 53 G4double G4VGaussianQuadrature::GetAbscissa(G4 <<  58 G4double
                                                   >>  59 G4VGaussianQuadrature::GetAbscissa(G4int index) const
 54 {                                                  60 {
 55   return fAbscissa[index];                     <<  61    return fAbscissa[index] ;
 56 }                                                  62 }
 57                                                    63 
 58 G4double G4VGaussianQuadrature::GetWeight(G4in <<  64 G4double
                                                   >>  65 G4VGaussianQuadrature::GetWeight(G4int index) const
 59 {                                                  66 {
 60   return fWeight[index];                       <<  67    return fWeight[index] ;
 61 }                                                  68 }
 62                                                    69 
 63 G4int G4VGaussianQuadrature::GetNumber() const << 
 64                                                    70 
 65 // -------------------------------------------     71 // ----------------------------------------------------------------------------
 66 //                                                 72 //
 67 // Auxiliary function which returns the value      73 // Auxiliary function which returns the value of std::log(gamma-function(x))
 68 //                                                 74 //
 69                                                    75 
 70 G4double G4VGaussianQuadrature::GammaLogarithm <<  76 G4double 
                                                   >>  77 G4VGaussianQuadrature::GammaLogarithm(G4double xx)
 71 {                                                  78 {
 72   // Returns the value ln(Gamma(xx) for xx > 0 <<  79 
 73   // xx > 1. For 0 < xx < 1. the reflection fo <<  80 // Returns the value ln(Gamma(xx) for xx > 0.  Full accuracy is obtained for 
 74   // (Adapted from Numerical Recipes in C)     <<  81 // xx > 1. For 0 < xx < 1. the reflection formula (6.1.4) can be used first.
 75                                                <<  82 // (Adapted from Numerical Recipes in C)
 76   static const G4double cof[6] = { 76.18009172 <<  83 
 77                                    24.01409824 <<  84   static G4double cof[6] = { 76.18009172947146,     -86.50532032941677,
 78                                    0.120865097 <<  85                              24.01409824083091,      -1.231739572450155,
 79   G4double x                   = xx - 1.0;     <<  86                               0.1208650973866179e-2, -0.5395239384953e-5  } ;
 80   G4double tmp                 = x + 5.5;      <<  87   register G4int j;
                                                   >>  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 ( 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 }
                                                   >> 100 
                                                   >> 101 
                                                   >> 102    
 91                                                   103