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25 // 25 //
26 // 26 //
>> 27 // $Id: G4LinInterpolation.cc,v 1.3 2006/06/29 19:40:03 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-09-01 $
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 // 14 JUn 2009 NAK New Calculation me <<
34 // from the G4EMLOW d <<
35 // 35 //
36 // ------------------------------------------- 36 // -------------------------------------------------------------------
37 37
38 #include "G4LinInterpolation.hh" 38 #include "G4LinInterpolation.hh"
39 39
40 // Constructor 40 // Constructor
41 // ------------------------------------------- << 41
42 G4LinInterpolation::G4LinInterpolation() 42 G4LinInterpolation::G4LinInterpolation()
43 { } 43 { }
44 44
45 // ------------------------------------------- <<
46 // Destructor 45 // Destructor
>> 46
47 G4LinInterpolation::~G4LinInterpolation() 47 G4LinInterpolation::~G4LinInterpolation()
48 { } 48 { }
49 49
50 // ------------------------------------------- << 50
51 G4VDataSetAlgorithm* G4LinInterpolation::Clone 51 G4VDataSetAlgorithm* G4LinInterpolation::Clone() const
52 { return new G4LinInterpolation; } 52 { return new G4LinInterpolation; }
53 53
54 // ------------------------------------------- <<
55 G4double G4LinInterpolation::Calculate(G4doubl 54 G4double G4LinInterpolation::Calculate(G4double x, G4int bin,
56 const G4DataVector& points, 55 const G4DataVector& points,
57 const G4DataVector& data) const 56 const G4DataVector& data) const
58 { 57 {
59 //G4cout << "G4LinInterpolation is performed << 58 G4int nBins = data.size() - 1;
60 G4int nBins = G4int(data.size() - 1); <<
61 G4double value = 0.; 59 G4double value = 0.;
62 if (x < points[0]) 60 if (x < points[0])
63 { 61 {
64 value = 0.; 62 value = 0.;
65 } 63 }
66 else if (bin < nBins) 64 else if (bin < nBins)
67 { 65 {
68 G4double e1 = points[bin]; 66 G4double e1 = points[bin];
69 G4double e2 = points[bin+1]; 67 G4double e2 = points[bin+1];
70 G4double d1 = data[bin]; 68 G4double d1 = data[bin];
71 G4double d2 = data[bin+1]; 69 G4double d2 = data[bin+1];
72 value = d1 + (d2 - d1)*(x - e1)/(e2 - e1 70 value = d1 + (d2 - d1)*(x - e1)/(e2 - e1);
73 } 71 }
74 else 72 else
75 { 73 {
76 value = data[nBins]; 74 value = data[nBins];
77 } 75 }
78 return value; <<
79 } <<
80 <<
81 // ------------------------------------------- <<
82 //Nicolas A. Karakatsanis: New Calculation met <<
83 // from the G4EMLOW da <<
84 <<
85 G4double G4LinInterpolation::Calculate(G4doubl <<
86 const G4DataVector& points, <<
87 const G <<
88 const G <<
89 const G4DataVector& log_data) c <<
90 { <<
91 //Linear Interpolation is performed on loagari <<
92 //Equivalent to log-log interpolation on non-l <<
93 //G4cout << "G4LinInterpolation is performed <<
94 G4int nBins = G4int(data.size() - 1); <<
95 G4double value = 0.; <<
96 G4double log_x = std::log10(x); <<
97 if (x < points[0]) <<
98 { <<
99 value = 0.; <<
100 } <<
101 else if (bin < nBins) <<
102 { <<
103 G4double log_e1 = log_points[bin]; <<
104 G4double log_e2 = log_points[bin+1]; <<
105 G4double log_d1 = log_data[bin]; <<
106 G4double log_d2 = log_data[bin+1]; <<
107 <<
108 // Values e1, e2, d1 and d2 are the log values <<
109 // original energy and data values. Simple lin <<
110 // on loagarithmic data should be equivalent t <<
111 value = log_d1 + (log_d2 - log_d1)*(log_ <<
112 <<
113 // Delogarithmize to obtain interpolated value <<
114 value = std::pow(10.,value); <<
115 } <<
116 else <<
117 { <<
118 value = data[nBins]; <<
119 } <<
120 return value; 76 return value;
121 } 77 }
122 78