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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: geant4-09-01-patch-03 $
>> 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