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26 // 26 //
>> 27 // $Id: G4SemiLogInterpolation.cc,v 1.6 2006/06/29 19:41:18 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-09-02 $
27 // 29 //
28 // Author: Maria Grazia Pia (Maria.Grazia.Pia@ 30 // Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
29 // 31 //
30 // History: 32 // History:
31 // ----------- 33 // -----------
32 // 31 Jul 2001 MGP Created 34 // 31 Jul 2001 MGP Created
33 // 35 //
34 // ------------------------------------------- 36 // -------------------------------------------------------------------
35 37
36 #include "G4SemiLogInterpolation.hh" 38 #include "G4SemiLogInterpolation.hh"
37 39
38 //....oooOO0OOooo........oooOO0OOooo........oo <<
39 // Constructor 40 // Constructor
>> 41
40 G4SemiLogInterpolation::G4SemiLogInterpolation 42 G4SemiLogInterpolation::G4SemiLogInterpolation()
41 { } 43 { }
42 44
43 45
44 //....oooOO0OOooo........oooOO0OOooo........oo <<
45 // Destructor 46 // Destructor
>> 47
46 G4SemiLogInterpolation::~G4SemiLogInterpolatio 48 G4SemiLogInterpolation::~G4SemiLogInterpolation()
47 { } 49 { }
48 50
49 //....oooOO0OOooo........oooOO0OOooo........oo <<
50 G4VDataSetAlgorithm* G4SemiLogInterpolation::C 51 G4VDataSetAlgorithm* G4SemiLogInterpolation::Clone() const
51 { return new G4SemiLogInterpolation; } 52 { return new G4SemiLogInterpolation; }
52 53
53 //....oooOO0OOooo........oooOO0OOooo........oo << 54
54 G4double G4SemiLogInterpolation::Calculate(G4d 55 G4double G4SemiLogInterpolation::Calculate(G4double x, G4int bin,
55 const G4DataVector& points, 56 const G4DataVector& points,
56 const G4DataVector& data) const 57 const G4DataVector& data) const
57 { 58 {
58 G4int nBins = G4int(data.size() - 1); << 59 G4int nBins = data.size() - 1;
59 G4double value = 0.; 60 G4double value = 0.;
60 if (x < points[0]) 61 if (x < points[0])
61 { 62 {
62 value = 0.; 63 value = 0.;
63 } 64 }
64 else if (bin < nBins) 65 else if (bin < nBins)
65 { 66 {
66 G4double e1 = points[bin]; 67 G4double e1 = points[bin];
67 G4double e2 = points[bin+1]; 68 G4double e2 = points[bin+1];
68 G4double d1 = data[bin]; 69 G4double d1 = data[bin];
69 G4double d2 = data[bin+1]; 70 G4double d2 = data[bin+1];
70 value = (d1*std::log10(e2/x) + d2*std::l 71 value = (d1*std::log10(e2/x) + d2*std::log10(x/e1)) / std::log10(e2/e1);
71 } 72 }
72 else 73 else
73 { 74 {
74 value = data[nBins]; 75 value = data[nBins];
75 } 76 }
76 return value; 77 return value;
77 } 78 }
78 <<
79 //....oooOO0OOooo........oooOO0OOooo........oo <<
80 G4double G4SemiLogInterpolation::Calculate(G4d <<
81 const G4DataVector& points, <<
82 con <<
83 con <<
84 const G4DataVector& /*log_d <<
85 { <<
86 //A combination of logarithmic interpolation <<
87 //linear Interpolation on data set <<
88 //G4cout << "G4SemiLogInterpolation is perfo <<
89 G4int nBins = G4int(data.size() - 1); <<
90 G4double value = 0.; <<
91 G4double log_x = std::log10(x); <<
92 if (x < points[0]) <<
93 { <<
94 value = 0.; <<
95 } <<
96 else if (bin < nBins) <<
97 { <<
98 G4double e1 = points[bin]; <<
99 G4double e2 = points[bin+1]; <<
100 G4double d1 = data[bin]; <<
101 G4double d2 = data[bin+1]; <<
102 G4double log_e1 = log_points[bin]; <<
103 G4double log_e2 = log_points[bin+1]; <<
104 <<
105 // Values log_e1 and log_e2 are the log <<
106 // original energy actual values. Origin <<
107 // Simple linear interpolation performed <<
108 // should be equivalent to semi log-log <<
109 if (e1 == 0.0) log_e1 = -300; <<
110 if (e2 == 0.0) log_e2 = -300; <<
111 value = d1 + (d2 - d1)*(log_x - log_e1)/ <<
112 } <<
113 else <<
114 { <<
115 value = data[nBins]; <<
116 } <<
117 return value; <<
118 } <<
119 <<
120 79