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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: Maria Grazia Pia (Maria.Grazia.Pia@ 28 // Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
29 // 29 //
30 // History: 30 // History:
31 // ----------- 31 // -----------
32 // 31 Jul 2001 MGP Created 32 // 31 Jul 2001 MGP Created
33 // 33 //
34 // ------------------------------------------- 34 // -------------------------------------------------------------------
35 35
36 #include "G4SemiLogInterpolation.hh" 36 #include "G4SemiLogInterpolation.hh"
37 37
38 //....oooOO0OOooo........oooOO0OOooo........oo 38 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
39 // Constructor 39 // Constructor
40 G4SemiLogInterpolation::G4SemiLogInterpolation 40 G4SemiLogInterpolation::G4SemiLogInterpolation()
41 { } 41 { }
42 42
43 43
44 //....oooOO0OOooo........oooOO0OOooo........oo 44 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
45 // Destructor 45 // Destructor
46 G4SemiLogInterpolation::~G4SemiLogInterpolatio 46 G4SemiLogInterpolation::~G4SemiLogInterpolation()
47 { } 47 { }
48 48
49 //....oooOO0OOooo........oooOO0OOooo........oo 49 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
50 G4VDataSetAlgorithm* G4SemiLogInterpolation::C 50 G4VDataSetAlgorithm* G4SemiLogInterpolation::Clone() const
51 { return new G4SemiLogInterpolation; } 51 { return new G4SemiLogInterpolation; }
52 52
53 //....oooOO0OOooo........oooOO0OOooo........oo 53 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
54 G4double G4SemiLogInterpolation::Calculate(G4d 54 G4double G4SemiLogInterpolation::Calculate(G4double x, G4int bin,
55 const G4DataVector& points, 55 const G4DataVector& points,
56 const G4DataVector& data) const 56 const G4DataVector& data) const
57 { 57 {
58 G4int nBins = G4int(data.size() - 1); << 58 G4int nBins = data.size() - 1;
59 G4double value = 0.; 59 G4double value = 0.;
60 if (x < points[0]) 60 if (x < points[0])
61 { 61 {
62 value = 0.; 62 value = 0.;
63 } 63 }
64 else if (bin < nBins) 64 else if (bin < nBins)
65 { 65 {
66 G4double e1 = points[bin]; 66 G4double e1 = points[bin];
67 G4double e2 = points[bin+1]; 67 G4double e2 = points[bin+1];
68 G4double d1 = data[bin]; 68 G4double d1 = data[bin];
69 G4double d2 = data[bin+1]; 69 G4double d2 = data[bin+1];
70 value = (d1*std::log10(e2/x) + d2*std::l 70 value = (d1*std::log10(e2/x) + d2*std::log10(x/e1)) / std::log10(e2/e1);
71 } 71 }
72 else 72 else
73 { 73 {
74 value = data[nBins]; 74 value = data[nBins];
75 } 75 }
76 return value; 76 return value;
77 } 77 }
78 78
79 //....oooOO0OOooo........oooOO0OOooo........oo 79 //....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
80 G4double G4SemiLogInterpolation::Calculate(G4d 80 G4double G4SemiLogInterpolation::Calculate(G4double x, G4int bin,
81 const G4DataVector& points, 81 const G4DataVector& points,
82 con 82 const G4DataVector& data,
83 con 83 const G4DataVector& log_points,
84 const G4DataVector& /*log_d 84 const G4DataVector& /*log_data*/) const
85 { 85 {
86 //A combination of logarithmic interpolation 86 //A combination of logarithmic interpolation on energy set and
87 //linear Interpolation on data set 87 //linear Interpolation on data set
88 //G4cout << "G4SemiLogInterpolation is perfo 88 //G4cout << "G4SemiLogInterpolation is performed (4 arguments)" << G4endl;
89 G4int nBins = G4int(data.size() - 1); << 89 G4int nBins = data.size() - 1;
90 G4double value = 0.; 90 G4double value = 0.;
91 G4double log_x = std::log10(x); 91 G4double log_x = std::log10(x);
92 if (x < points[0]) 92 if (x < points[0])
93 { 93 {
94 value = 0.; 94 value = 0.;
95 } 95 }
96 else if (bin < nBins) 96 else if (bin < nBins)
97 { 97 {
98 G4double e1 = points[bin]; 98 G4double e1 = points[bin];
99 G4double e2 = points[bin+1]; 99 G4double e2 = points[bin+1];
100 G4double d1 = data[bin]; 100 G4double d1 = data[bin];
101 G4double d2 = data[bin+1]; 101 G4double d2 = data[bin+1];
102 G4double log_e1 = log_points[bin]; 102 G4double log_e1 = log_points[bin];
103 G4double log_e2 = log_points[bin+1]; 103 G4double log_e2 = log_points[bin+1];
104 104
105 // Values log_e1 and log_e2 are the log 105 // Values log_e1 and log_e2 are the log values of the corresponding
106 // original energy actual values. Origin 106 // original energy actual values. Original d1 and d2 values are used.
107 // Simple linear interpolation performed 107 // Simple linear interpolation performed on loagarithmic data
108 // should be equivalent to semi log-log 108 // should be equivalent to semi log-log interpolation
109 if (e1 == 0.0) log_e1 = -300; 109 if (e1 == 0.0) log_e1 = -300;
110 if (e2 == 0.0) log_e2 = -300; 110 if (e2 == 0.0) log_e2 = -300;
111 value = d1 + (d2 - d1)*(log_x - log_e1)/ 111 value = d1 + (d2 - d1)*(log_x - log_e1)/(log_e2 - log_e1);
112 } 112 }
113 else 113 else
114 { 114 {
115 value = data[nBins]; 115 value = data[nBins];
116 } 116 }
117 return value; 117 return value;
118 } 118 }
119 119
120 120