| Geant4 Cross Reference |
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 //
27 // Author: Vladimir Ivanchenko (Vladimir.Ivantchenko@cern.ch)
28 //
29 // History:
30 // -----------
31 // 29 May 2002 VI Created
32 //
33 // -------------------------------------------------------------------
34
35 #include "G4LinLogLogInterpolation.hh"
36
37 // Constructor
38
39 G4LinLogLogInterpolation::G4LinLogLogInterpolation()
40 { }
41
42 // Destructor
43
44 G4LinLogLogInterpolation::~G4LinLogLogInterpolation()
45 { }
46
47 G4VDataSetAlgorithm* G4LinLogLogInterpolation::Clone() const
48 { return new G4LinLogLogInterpolation; }
49
50
51 G4double G4LinLogLogInterpolation::Calculate(G4double x, G4int bin,
52 const G4DataVector& points,
53 const G4DataVector& data) const
54 {
55 //G4cout << "G4LinLogLogInterpolation is performed (2 arguments) " << G4endl;
56 G4int nBins = G4int(data.size() - 1);
57 G4double value = 0.;
58 if (x < points[0])
59 {
60 value = 0.;
61 }
62 else if (bin < nBins)
63 {
64 G4double e1 = points[bin];
65 G4double e2 = points[bin+1];
66 G4double d1 = data[bin];
67 G4double d2 = data[bin+1];
68 if(d1 > 0.0 && d2 > 0.0) {
69 value = (std::log10(d1)*std::log10(e2/x) + std::log10(d2)*std::log10(x/e1)) / std::log10(e2/e1);
70 value = std::pow(10.,value);
71 } else {
72 value = (d1*std::log10(e2/x) + d2*std::log10(x/e1)) / std::log10(e2/e1);
73 }
74 }
75 else
76 {
77 value = data[nBins];
78 }
79
80 return value;
81 }
82
83 G4double G4LinLogLogInterpolation::Calculate(G4double x, G4int bin,
84 const G4DataVector& points,
85 const G4DataVector& data,
86 const G4DataVector& log_points,
87 const G4DataVector& log_data) const
88 {
89 //G4cout << "G4LinLogLogInterpolation is performed(4 arguments) " << G4endl;
90 G4int nBins = G4int(data.size() - 1);
91 G4double value = 0.;
92 G4double log_x = std::log10(x);
93 if (x < points[0])
94 {
95 value = 0.;
96 }
97 else if (bin < nBins)
98 {
99 G4double e1 = points[bin];
100 G4double e2 = points[bin+1];
101 G4double d1 = data[bin];
102 G4double d2 = data[bin+1];
103 G4double log_e1 = log_points[bin];
104 G4double log_e2 = log_points[bin+1];
105 G4double log_d1 = log_data[bin];
106 G4double log_d2 = log_data[bin+1];
107 //G4cout << "x = " << x << " , log_x = " << log_x << " , bin = " << bin << G4endl;
108 //G4cout << "e1 = " << e1 << " , d1 = " << d1 << G4endl;
109 //G4cout << "e2 = " << e2 << " , d2 = " << d2 << G4endl;
110 //G4cout << "log_e1 = " << log_e1 << " , log_d1 = " << log_d1 << G4endl;
111 //G4cout << "log_e2 = " << log_e2 << " , log_d2 = " << log_d2 <<G4endl;
112 if (d1 > 0.0 && d2 > 0.0)
113 {
114 // Values e1, e2, d1 and d2 are the log values of the corresponding
115 // original energy and data values. Simple linear interpolation performed
116 // on loagarithmic data should be equivalent to log-log interpolation
117 value = log_d1 + (log_d2 - log_d1)*(log_x - log_e1)/(log_e2 - log_e1);
118
119 //G4cout << "Case of normal log-log interpolation" << G4endl;
120 //G4cout << "Temp log interpolated value: log_value = " << value << G4endl;
121
122 // Delogarithmize to obtain interpolated value
123 value = std::pow(10.,value);
124
125 //G4cout << "Final Interpolated value: " << value << G4endl << G4endl;
126 }
127 else
128 {
129 // Case of semi log-log interpolation
130 //G4cout << "G4LinLogLogInterpolation - Case of SemiLogInterpolation" << G4endl;
131 if (e1 == 0.0) e1 = 1e-300;
132 if (e2 == 0.0) e2 = 1e-300;
133 value = d1 + (d2 - d1)*(log_x - log_e1)/(log_e2 - log_e1);
134 //G4cout << "LinLogInterpolation: Final Interpolated value: " << value << G4endl << G4endl;
135 }
136 }
137 else
138 {
139 value = data[nBins];
140 }
141 return value;
142 }
143