| Geant4 Cross Reference |
1 //
2 // ********************************************************************
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4 // * *
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18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
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24 // ********************************************************************
25 //
26 //
27 //
28 // Author: Vladimir Ivanchenko (Vladimir.Ivantchenko@cern.ch)
29 //
30 // History:
31 // -----------
32 // 27 May 2002 VI Created
33 //
34 // -------------------------------------------------------------------
35
36 #include "G4LinLogInterpolation.hh"
37 #include "G4Exp.hh"
38
39 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
40 // Constructor
41 G4LinLogInterpolation::G4LinLogInterpolation()
42 { }
43
44 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
45 // Destructor
46 G4LinLogInterpolation::~G4LinLogInterpolation()
47 { }
48
49 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
50 G4double G4LinLogInterpolation::Calculate(G4double x, G4int bin,
51 const G4DataVector& points,
52 const G4DataVector& data) const
53 {
54 //G4cout << "G4LinLogInterpolation is performed on dataset (2 arguments) " << G4endl;
55 G4int nBins = G4int(data.size() - 1);
56 G4double value = 0.;
57 if (x < points[0])
58 {
59 value = 0.;
60 }
61 else if (bin < nBins)
62 {
63 G4double e1 = points[bin];
64 G4double e2 = points[bin+1];
65 G4double d1 = std::log(data[bin]);
66 G4double d2 = std::log(data[bin+1]);
67 value = G4Exp(d1 + (d2 - d1)*(x - e1)/ (e2 - e1));
68 }
69 else
70 {
71 value = data[nBins];
72 }
73 return value;
74 }
75
76 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
77
78 G4double G4LinLogInterpolation::Calculate(G4double x, G4int bin,
79 const G4DataVector& points,
80 const G4DataVector& data,
81 const G4DataVector& /*log_points*/,
82 const G4DataVector& log_data) const
83 {
84 //G4cout << "G4LinLogInterpolation is performed on dataset (4 arguments) " << G4endl;
85 G4int nBins = G4int(data.size() - 1);
86 G4double value = 0.;
87 //G4double log_x = std::log10(x);
88 if (x < points[0])
89 {
90 value = 0.;
91 }
92 else if (bin < nBins)
93 {
94 G4double e1 = points[bin];
95 G4double e2 = points[bin+1];
96 G4double d1 = data[bin];
97 G4double d2 = data[bin+1];
98 //G4double log_e1 = log_points[bin];
99 //G4double log_e2 = log_points[bin+1];
100 G4double log_d1 = log_data[bin];
101 G4double log_d2 = log_data[bin+1];
102 if (d1 > 0.0 && d2 > 0.0)
103 {
104 // Values e1, e2, d1 and d2 are the log values of the corresponding
105 // original energy and data values.
106 // Simple linear interpolation performed
107 // on logarithmic data should be equivalent to log-log interpolation
108 //value = log_d1 + (log_d2 - log_d1)*(log_x - log_e1)/(log_e2 - log_e1);
109 value = G4Exp(log_d1 + (log_d2 - log_d1)*(x - e1)/(e2 - e1));
110 }
111 else
112 {
113 if (d1 == 0.0) log_d1 = -300;
114 if (d2 == 0.0) log_d2 = -300;
115 value = G4Exp(log_d1 + (log_d2 - log_d1)*(x - e1)/(e2 - e1));
116 }
117 }
118 else
119 {
120 value = data[nBins];
121 }
122 return value;
123 }
124