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25 //
26 // neutron_hp -- source file
27 // J.P. Wellisch, Nov-1996
28 // A prototype of the low energy neutron transport model.
29 //
30 // P. Arce, June-2014 Conversion neutron_hp to particle_hp
31 //
32 #include "G4ParticleHPInterpolator.hh"
33
34 #include "G4Pow.hh"
35
36 G4double G4ParticleHPInterpolator::GetBinIntegral(const G4InterpolationScheme& aScheme,
37 const G4double x1, const G4double x2,
38 const G4double y1, const G4double y2)
39 { // inline again later on @@@@
40 G4double result = 0;
41 if (aScheme == HISTO || aScheme == CHISTO || aScheme == UHISTO) {
42 result = y1 * (x2 - x1);
43 }
44 else if (aScheme == LINLIN || aScheme == CLINLIN || aScheme == ULINLIN) {
45 result = 0.5 * (y2 + y1) * (x2 - x1);
46 }
47 else if (aScheme == LINLOG || aScheme == CLINLOG || aScheme == ULINLOG) {
48 if (x1 == 0)
49 result = y1;
50 else if (x2 == 0)
51 result = y2;
52 else {
53 G4double b = (y2 - y1) / (G4Log(x2) - G4Log(x1));
54 G4double a = y1 - b * G4Log(x1);
55 result = (a - b) * (x2 - x1) + b * (x2 * G4Log(x2) - x1 * G4Log(x1));
56 }
57 }
58 else if (aScheme == LOGLIN || aScheme == CLOGLIN || aScheme == ULOGLIN) {
59 if (y1 == 0 || y2 == 0) {
60 result = 0;
61 }
62 else {
63 // G4double b = (std::log(y2)-std::log(y1))/(x2-x1);
64 // G4double a = std::log(y1) - b*x1;
65 //***************************************************************
66 // EMendoza:
67 // result = (std::exp(a)/b)*(std::exp(b*x2)-std::exp(b*x1));
68 //***************************************************************
69 if (y1 != y2) {
70 result = (x2 - x1) * (y2 - y1) / G4Log(y2 / y1);
71 }
72 else {
73 result = y2 * (x2 - x1);
74 }
75 //***************************************************************
76 }
77 }
78 else if (aScheme == LOGLOG || aScheme == CLOGLOG || aScheme == ULOGLOG) {
79 if (x1 == 0)
80 result = y1;
81 else if (x2 == 0)
82 result = y2;
83 else if (y1 == 0 || y2 == 0)
84 result = 0;
85 else {
86 G4double b = (G4Log(y2) - G4Log(y1)) / (G4Log(x2) - G4Log(x1));
87 G4double a = G4Log(y1) - b * G4Log(x1);
88 ;
89 result = (G4Exp(a) / (b + 1))
90 * (G4Pow::GetInstance()->powA(x2, b + 1) - G4Pow::GetInstance()->powA(x1, b + 1));
91 }
92 }
93 else {
94 throw G4HadronicException(__FILE__, __LINE__,
95 "Unknown interpolation scheme in G4ParticleHPVector::Integrate");
96 }
97 return result;
98 }
99 G4double G4ParticleHPInterpolator::GetWeightedBinIntegral(const G4InterpolationScheme& aScheme,
100 const G4double x1, const G4double x2,
101 const G4double y1, const G4double y2)
102 { // inline again later on @@@@
103 G4double result = 0;
104 if (aScheme == HISTO || aScheme == CHISTO || aScheme == UHISTO) {
105 result = 0.5 * y1 * (x2 * x2 - x1 * x1);
106 }
107 else if (aScheme == LINLIN || aScheme == CLINLIN || aScheme == ULINLIN) {
108 // G4double b = (y2-y1)/(x2-x1);
109 // G4double a = y1 - b*x1;
110 // result = 0.5*a*(x2*x2-x1*x1) + (b/3.)*(x2*x2*x2-x1*x1*x1);
111 // Factor out x2-x1 to avoid divide by zero
112
113 result = (y1 * x2 - y2 * x1) * (x2 + x1) / 2. + (y2 - y1) * (x2 * x2 + x2 * x1 + x1 * x1) / 3.;
114 }
115 else if (aScheme == LINLOG || aScheme == CLINLOG || aScheme == ULINLOG) {
116 if (x1 == 0)
117 result = y1;
118 else if (x2 == 0)
119 result = y2;
120 else {
121 G4double b = (y2 - y1) / (G4Log(x2) - G4Log(x1));
122 G4double a = y1 - b * G4Log(x1);
123 result = (x2 * x2 / 2. * (a - b / 2. + b * G4Log(x2)))
124 - (x1 * x1 / 2. * (a - b / 2. + b * G4Log(x1)));
125 }
126 }
127 else if (aScheme == LOGLIN || aScheme == CLOGLIN || aScheme == ULOGLIN) {
128 if (y1 == 0 || y2 == 0)
129 result = 0;
130 else {
131 G4double b = (G4Log(y2) - G4Log(y1)) / (x2 - x1);
132 G4double a = G4Log(y1) - b * x1;
133 result = G4Exp(a) / (b * b) * (G4Exp(b * x2) * (b * x2 - 1.) - G4Exp(b * x1) * (b * x1 - 1.));
134 }
135 }
136 else if (aScheme == LOGLOG || aScheme == CLOGLOG || aScheme == ULOGLOG) {
137 if (x1 == 0)
138 result = y1;
139 else if (x2 == 0)
140 result = y2;
141 else if (y1 == 0 || y2 == 0)
142 result = 0;
143 else {
144 G4double b = (G4Log(y2) - G4Log(y1)) / (G4Log(x2) - G4Log(x1));
145 G4double a = G4Log(y1) - b * G4Log(x1);
146 ;
147 result = G4Exp(a) / (b + 2.)
148 * (G4Pow::GetInstance()->powA(x2, b + 2.) - G4Pow::GetInstance()->powA(x1, b + 2));
149 }
150 }
151 else {
152 throw G4HadronicException(__FILE__, __LINE__,
153 "Unknown interpolation scheme in G4ParticleHPVector::Integrate");
154 }
155 return result;
156 }
157