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1 // 1 //
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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-cand-03 $
>> 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