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G4SemiLogInterpolation.cc
Go to the documentation of this file. Or view the newest version in sPHENIX GitHub for file G4SemiLogInterpolation.cc
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25 //
26 //
27 //
28 // Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
29 //
30 // History:
31 // -----------
32 // 31 Jul 2001 MGP Created
33 //
34 // -------------------------------------------------------------------
35 
37 
38 // Constructor
39 
41 { }
42 
43 
44 // Destructor
45 
47 { }
48 
50 { return new G4SemiLogInterpolation; }
51 
52 
54  const G4DataVector& points,
55  const G4DataVector& data) const
56 {
57  //G4cout << "G4SemiLogInterpolation is performed(2 arguments) " << G4endl;
58  G4int nBins = data.size() - 1;
59  G4double value = 0.;
60  if (x < points[0])
61  {
62  value = 0.;
63  }
64  else if (bin < nBins)
65  {
66  G4double e1 = points[bin];
67  G4double e2 = points[bin+1];
68  G4double d1 = data[bin];
69  G4double d2 = data[bin+1];
70  value = (d1*std::log10(e2/x) + d2*std::log10(x/e1)) / std::log10(e2/e1);
71  }
72  else
73  {
74  value = data[nBins];
75  }
76  return value;
77 }
78 
80  const G4DataVector& points,
81  const G4DataVector& data,
82  const G4DataVector& log_points,
83  const G4DataVector& /*log_data*/) const
84 {
85 //A combination of logarithmic interpolation on energy set and
86 //linear Interpolation on data set
87  //G4cout << "G4SemiLogInterpolation is performed (4 arguments)" << G4endl;
88  G4int nBins = data.size() - 1;
89  G4double value = 0.;
90  G4double log_x = std::log10(x);
91  if (x < points[0])
92  {
93  value = 0.;
94  }
95  else if (bin < nBins)
96  {
97  G4double e1 = points[bin];
98  G4double e2 = points[bin+1];
99  G4double d1 = data[bin];
100  G4double d2 = data[bin+1];
101  G4double log_e1 = log_points[bin];
102  G4double log_e2 = log_points[bin+1];
103  //G4double log_d1 = log_data[bin];
104  //G4double log_d2 = log_data[bin+1];
105  //G4cout << "x = " << x << " , log_x = " << log_x << " , bin = " << bin << G4endl;
106  //G4cout << "e1 = " << e1 << " , d1 = " << d1 << G4endl;
107  //G4cout << "e2 = " << e2 << " , d2 = " << d2 << G4endl;
108 // Values log_e1 and log_e2 are the log values of the corresponding
109 // original energy actual values. Original d1 and d2 values are used.
110 // Simple linear interpolation performed on loagarithmic data
111 // should be equivalent to semi log-log interpolation
112  if (e1 == 0.0) log_e1 = -300;
113  if (e2 == 0.0) log_e2 = -300;
114  value = d1 + (d2 - d1)*(log_x - log_e1)/(log_e2 - log_e1);
115  //G4cout << "G4SemiLogInterpolation - Final Interpolated Value: " << value << G4endl << G4endl;
116  }
117  else
118  {
119  value = data[nBins];
120  }
121  return value;
122 }
123