| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer 3 // * License and Disclaimer *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/ 8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. 9 // * include a list of copyright holders. *
10 // * 10 // * *
11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. *
17 // * 17 // * *
18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. *
24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4VGaussianQuadrature class implementation <<
27 // 26 //
28 // Author: V.Grichine, 18.04.1997 << 27 // $Id$
29 // ------------------------------------------- << 28 //
>> 29 // Implementation file for G4VGaussianQuadrature virtual base class
>> 30 //
30 31
31 #include "G4VGaussianQuadrature.hh" <<
32 #include "G4ios.hh" 32 #include "G4ios.hh"
33 #include "globals.hh" 33 #include "globals.hh"
>> 34 #include "G4VGaussianQuadrature.hh"
34 35
35 G4VGaussianQuadrature::G4VGaussianQuadrature(f << 36 G4VGaussianQuadrature::G4VGaussianQuadrature( function pFunction )
36 : fFunction(pFunction) << 37 : fFunction(pFunction), fAbscissa(0), fWeight(0), fNumber(0)
37 {} << 38 {
>> 39 }
38 40
39 // ------------------------------------------- 41 // -------------------------------------------------------------------
40 // 42 //
41 // Virtual destructor which deletes dynamicall 43 // Virtual destructor which deletes dynamically allocated memory
42 // 44 //
43 45
44 G4VGaussianQuadrature::~G4VGaussianQuadrature( << 46 G4VGaussianQuadrature::~G4VGaussianQuadrature()
45 { 47 {
46 delete[] fAbscissa; << 48 delete[] fAbscissa ;
47 delete[] fWeight; << 49 delete[] fWeight ;
48 } 50 }
49 51
50 // -------------------------- Access functions << 52 // -------------------------- Access functions ----------------------------------
51 // ---------------------------------- <<
52 53
53 G4double G4VGaussianQuadrature::GetAbscissa(G4 << 54 G4double
>> 55 G4VGaussianQuadrature::GetAbscissa(G4int index) const
54 { 56 {
55 return fAbscissa[index]; << 57 return fAbscissa[index] ;
56 } 58 }
57 59
58 G4double G4VGaussianQuadrature::GetWeight(G4in << 60 G4double
>> 61 G4VGaussianQuadrature::GetWeight(G4int index) const
59 { 62 {
60 return fWeight[index]; << 63 return fWeight[index] ;
61 } 64 }
62 65
63 G4int G4VGaussianQuadrature::GetNumber() const << 66 G4int G4VGaussianQuadrature::GetNumber() const
>> 67 {
>> 68 return fNumber ;
>> 69 }
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.
>> 82 // (Adapted from Numerical Recipes in C)
75 83
76 static const G4double cof[6] = { 76.18009172 84 static const G4double cof[6] = { 76.18009172947146, -86.50532032941677,
77 24.01409824 << 85 24.01409824083091, -1.231739572450155,
78 0.120865097 86 0.1208650973866179e-2, -0.5395239384953e-5 };
79 G4double x = xx - 1.0; << 87 G4double x = xx - 1.0;
80 G4double tmp = x + 5.5; << 88 G4double tmp = x + 5.5;
81 tmp -= (x + 0.5) * std::log(tmp); 89 tmp -= (x + 0.5) * std::log(tmp);
82 G4double ser = 1.000000000190015; 90 G4double ser = 1.000000000190015;
83 91
84 for(size_t j = 0; j <= 5; ++j) << 92 for ( size_t j = 0; j <= 5; j++ )
85 { 93 {
86 x += 1.0; 94 x += 1.0;
87 ser += cof[j] / x; << 95 ser += cof[j]/x;
88 } 96 }
89 return -tmp + std::log(2.5066282746310005 * << 97 return -tmp + std::log(2.5066282746310005*ser);
90 } 98 }
91 99