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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 // 14 JUn 2009 NAK New Calculation me 33 // 14 JUn 2009 NAK New Calculation method implemented to which logarithmic values
34 // from the G4EMLOW d 34 // from the G4EMLOW dataset are loaded directly to enhance performance
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 //G4cout << "G4LinInterpolation is performed (2 arguments)" << G4endl;
60 G4int nBins = G4int(data.size() - 1); << 59 G4int nBins = data.size() - 1;
61 G4double value = 0.; 60 G4double value = 0.;
62 if (x < points[0]) 61 if (x < points[0])
63 { 62 {
64 value = 0.; 63 value = 0.;
65 } 64 }
66 else if (bin < nBins) 65 else if (bin < nBins)
67 { 66 {
68 G4double e1 = points[bin]; 67 G4double e1 = points[bin];
69 G4double e2 = points[bin+1]; 68 G4double e2 = points[bin+1];
70 G4double d1 = data[bin]; 69 G4double d1 = data[bin];
71 G4double d2 = data[bin+1]; 70 G4double d2 = data[bin+1];
72 value = d1 + (d2 - d1)*(x - e1)/(e2 - e1 71 value = d1 + (d2 - d1)*(x - e1)/(e2 - e1);
73 } 72 }
74 else 73 else
75 { 74 {
76 value = data[nBins]; 75 value = data[nBins];
77 } 76 }
78 return value; 77 return value;
79 } 78 }
80 79
81 // ------------------------------------------- << 80
82 //Nicolas A. Karakatsanis: New Calculation met 81 //Nicolas A. Karakatsanis: New Calculation method implemented to which logarithmic values
83 // from the G4EMLOW da 82 // from the G4EMLOW dataset are loaded directly to enhance performance
84 83
85 G4double G4LinInterpolation::Calculate(G4doubl 84 G4double G4LinInterpolation::Calculate(G4double x, G4int bin,
86 const G4DataVector& points, 85 const G4DataVector& points,
87 const G 86 const G4DataVector& data,
88 const G 87 const G4DataVector& log_points,
89 const G4DataVector& log_data) c 88 const G4DataVector& log_data) const
90 { 89 {
91 //Linear Interpolation is performed on loagari 90 //Linear Interpolation is performed on loagarithmic data set
92 //Equivalent to log-log interpolation on non-l 91 //Equivalent to log-log interpolation on non-loagarithmic data set
93 //G4cout << "G4LinInterpolation is performed 92 //G4cout << "G4LinInterpolation is performed - (4 arguments)" << G4endl;
94 G4int nBins = G4int(data.size() - 1); << 93 G4int nBins = data.size() - 1;
95 G4double value = 0.; 94 G4double value = 0.;
96 G4double log_x = std::log10(x); 95 G4double log_x = std::log10(x);
97 if (x < points[0]) 96 if (x < points[0])
98 { 97 {
99 value = 0.; 98 value = 0.;
100 } 99 }
101 else if (bin < nBins) 100 else if (bin < nBins)
102 { 101 {
103 G4double log_e1 = log_points[bin]; 102 G4double log_e1 = log_points[bin];
104 G4double log_e2 = log_points[bin+1]; 103 G4double log_e2 = log_points[bin+1];
105 G4double log_d1 = log_data[bin]; 104 G4double log_d1 = log_data[bin];
106 G4double log_d2 = log_data[bin+1]; 105 G4double log_d2 = log_data[bin+1];
107 106
108 // Values e1, e2, d1 and d2 are the log values 107 // Values e1, e2, d1 and d2 are the log values of the corresponding
109 // original energy and data values. Simple lin 108 // original energy and data values. Simple linear interpolation performed
110 // on loagarithmic data should be equivalent t 109 // on loagarithmic data should be equivalent to log-log interpolation
111 value = log_d1 + (log_d2 - log_d1)*(log_ 110 value = log_d1 + (log_d2 - log_d1)*(log_x - log_e1)/(log_e2 - log_e1);
112 111
113 // Delogarithmize to obtain interpolated value 112 // Delogarithmize to obtain interpolated value
114 value = std::pow(10.,value); 113 value = std::pow(10.,value);
115 } 114 }
116 else 115 else
117 { 116 {
118 value = data[nBins]; 117 value = data[nBins];
119 } 118 }
120 return value; 119 return value;
121 } 120 }
122 121