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25 // 22 //
26 // 23 //
>> 24 // $Id: G4SemiLogInterpolation.cc,v 1.4 2002/05/28 09:20:21 pia Exp $
>> 25 // GEANT4 tag $Name: geant4-05-02 $
27 // 26 //
28 // Author: Maria Grazia Pia (Maria.Grazia.Pia@ 27 // Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
29 // 28 //
30 // History: 29 // History:
31 // ----------- 30 // -----------
32 // 31 Jul 2001 MGP Created 31 // 31 Jul 2001 MGP Created
33 // 32 //
34 // ------------------------------------------- 33 // -------------------------------------------------------------------
35 34
36 #include "G4SemiLogInterpolation.hh" 35 #include "G4SemiLogInterpolation.hh"
37 36
38 //....oooOO0OOooo........oooOO0OOooo........oo <<
39 // Constructor 37 // Constructor
>> 38
40 G4SemiLogInterpolation::G4SemiLogInterpolation 39 G4SemiLogInterpolation::G4SemiLogInterpolation()
41 { } 40 { }
42 41
43 42
44 //....oooOO0OOooo........oooOO0OOooo........oo <<
45 // Destructor 43 // Destructor
>> 44
46 G4SemiLogInterpolation::~G4SemiLogInterpolatio 45 G4SemiLogInterpolation::~G4SemiLogInterpolation()
47 { } 46 { }
48 47
49 //....oooOO0OOooo........oooOO0OOooo........oo <<
50 G4VDataSetAlgorithm* G4SemiLogInterpolation::C 48 G4VDataSetAlgorithm* G4SemiLogInterpolation::Clone() const
51 { return new G4SemiLogInterpolation; } 49 { return new G4SemiLogInterpolation; }
52 50
53 //....oooOO0OOooo........oooOO0OOooo........oo << 51
54 G4double G4SemiLogInterpolation::Calculate(G4d 52 G4double G4SemiLogInterpolation::Calculate(G4double x, G4int bin,
55 const G4DataVector& points, 53 const G4DataVector& points,
56 const G4DataVector& data) const 54 const G4DataVector& data) const
57 { 55 {
58 G4int nBins = G4int(data.size() - 1); << 56 G4int nBins = data.size() - 1;
59 G4double value = 0.; 57 G4double value = 0.;
60 if (x < points[0]) 58 if (x < points[0])
61 { 59 {
62 value = 0.; 60 value = 0.;
63 } 61 }
64 else if (bin < nBins) 62 else if (bin < nBins)
65 { 63 {
66 G4double e1 = points[bin]; 64 G4double e1 = points[bin];
67 G4double e2 = points[bin+1]; 65 G4double e2 = points[bin+1];
68 G4double d1 = data[bin]; 66 G4double d1 = data[bin];
69 G4double d2 = data[bin+1]; 67 G4double d2 = data[bin+1];
70 value = (d1*std::log10(e2/x) + d2*std::l << 68 value = (d1*log10(e2/x) + d2*log10(x/e1)) / log10(e2/e1);
71 } 69 }
72 else 70 else
73 { 71 {
74 value = data[nBins]; 72 value = data[nBins];
75 } 73 }
76 return value; 74 return value;
77 } 75 }
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 76