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1 // 1 //
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18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // 26 //
27 // 27 //
28 // Author: Vladimir Ivanchenko (Vladimir.Ivan 28 // Author: Vladimir Ivanchenko (Vladimir.Ivantchenko@cern.ch)
29 // 29 //
30 // History: 30 // History:
31 // ----------- 31 // -----------
32 // 27 May 2002 VI Created 32 // 27 May 2002 VI Created
33 // 33 //
34 // ------------------------------------------- 34 // -------------------------------------------------------------------
35 35
36 #include "G4LinLogInterpolation.hh" 36 #include "G4LinLogInterpolation.hh"
37 #include "G4Exp.hh" 37 #include "G4Exp.hh"
38 38
39 //....oooOO0OOooo........oooOO0OOooo........oo <<
40 // Constructor 39 // Constructor
>> 40
41 G4LinLogInterpolation::G4LinLogInterpolation() 41 G4LinLogInterpolation::G4LinLogInterpolation()
42 { } 42 { }
43 43
44 //....oooOO0OOooo........oooOO0OOooo........oo << 44
45 // Destructor 45 // Destructor
>> 46
46 G4LinLogInterpolation::~G4LinLogInterpolation( 47 G4LinLogInterpolation::~G4LinLogInterpolation()
47 { } 48 { }
48 49
49 //....oooOO0OOooo........oooOO0OOooo........oo << 50
50 G4double G4LinLogInterpolation::Calculate(G4do 51 G4double G4LinLogInterpolation::Calculate(G4double x, G4int bin,
51 const G4DataVector& points, 52 const G4DataVector& points,
52 const G4DataVector& data) const 53 const G4DataVector& data) const
53 { 54 {
54 //G4cout << "G4LinLogInterpolation is perfor 55 //G4cout << "G4LinLogInterpolation is performed on dataset (2 arguments) " << G4endl;
55 G4int nBins = G4int(data.size() - 1); << 56 G4int nBins = data.size() - 1;
56 G4double value = 0.; 57 G4double value = 0.;
57 if (x < points[0]) 58 if (x < points[0])
58 { 59 {
59 value = 0.; 60 value = 0.;
60 } 61 }
61 else if (bin < nBins) 62 else if (bin < nBins)
62 { 63 {
63 G4double e1 = points[bin]; 64 G4double e1 = points[bin];
64 G4double e2 = points[bin+1]; 65 G4double e2 = points[bin+1];
65 G4double d1 = std::log(data[bin]); 66 G4double d1 = std::log(data[bin]);
66 G4double d2 = std::log(data[bin+1]); 67 G4double d2 = std::log(data[bin+1]);
67 value = G4Exp(d1 + (d2 - d1)*(x - e1)/ ( 68 value = G4Exp(d1 + (d2 - d1)*(x - e1)/ (e2 - e1));
68 } 69 }
69 else 70 else
70 { 71 {
71 value = data[nBins]; 72 value = data[nBins];
72 } 73 }
73 return value; 74 return value;
74 } 75 }
75 76
76 //....oooOO0OOooo........oooOO0OOooo........oo <<
77 <<
78 G4double G4LinLogInterpolation::Calculate(G4do 77 G4double G4LinLogInterpolation::Calculate(G4double x, G4int bin,
79 const G4DataVector& points, 78 const G4DataVector& points,
80 cons 79 const G4DataVector& data,
81 cons 80 const G4DataVector& /*log_points*/,
82 const G4DataVector& log_data) cons 81 const G4DataVector& log_data) const
83 { 82 {
84 //G4cout << "G4LinLogInterpolation is perfor 83 //G4cout << "G4LinLogInterpolation is performed on dataset (4 arguments) " << G4endl;
85 G4int nBins = G4int(data.size() - 1); << 84 G4int nBins = data.size() - 1;
86 G4double value = 0.; 85 G4double value = 0.;
87 //G4double log_x = std::log10(x); 86 //G4double log_x = std::log10(x);
88 if (x < points[0]) 87 if (x < points[0])
89 { 88 {
90 value = 0.; 89 value = 0.;
91 } 90 }
92 else if (bin < nBins) 91 else if (bin < nBins)
93 { 92 {
94 G4double e1 = points[bin]; 93 G4double e1 = points[bin];
95 G4double e2 = points[bin+1]; 94 G4double e2 = points[bin+1];
96 G4double d1 = data[bin]; 95 G4double d1 = data[bin];
97 G4double d2 = data[bin+1]; 96 G4double d2 = data[bin+1];
98 //G4double log_e1 = log_points[bin]; 97 //G4double log_e1 = log_points[bin];
99 //G4double log_e2 = log_points[bin+1]; 98 //G4double log_e2 = log_points[bin+1];
100 G4double log_d1 = log_data[bin]; 99 G4double log_d1 = log_data[bin];
101 G4double log_d2 = log_data[bin+1]; 100 G4double log_d2 = log_data[bin+1];
102 if (d1 > 0.0 && d2 > 0.0) 101 if (d1 > 0.0 && d2 > 0.0)
103 { 102 {
104 // Values e1, e2, d1 and d2 are the log va << 103 // Values e1, e2, d1 and d2 are the log values of the corresponding
105 // original energy and data values. << 104 // original energy and data values. Simple linear interpolation performed
106 // Simple linear interpolation performed << 105 // on loagarithmic data should be equivalent to log-log interpolation
107 // on logarithmic data should be equivalen <<
108 //value = log_d1 + (log_d2 - log_d1) 106 //value = log_d1 + (log_d2 - log_d1)*(log_x - log_e1)/(log_e2 - log_e1);
109 value = G4Exp(log_d1 + (log_d2 - log 107 value = G4Exp(log_d1 + (log_d2 - log_d1)*(x - e1)/(e2 - e1));
110 } 108 }
111 else 109 else
112 { 110 {
113 if (d1 == 0.0) log_d1 = -300; 111 if (d1 == 0.0) log_d1 = -300;
114 if (d2 == 0.0) log_d2 = -300; 112 if (d2 == 0.0) log_d2 = -300;
115 value = G4Exp(log_d1 + (log_d2 - log 113 value = G4Exp(log_d1 + (log_d2 - log_d1)*(x - e1)/(e2 - e1));
116 } 114 }
117 } 115 }
118 else 116 else
119 { 117 {
120 value = data[nBins]; 118 value = data[nBins];
121 } 119 }
122 return value; 120 return value;
123 } 121 }
124 122