1 | // |
---|
2 | // ******************************************************************** |
---|
3 | // * License and Disclaimer * |
---|
4 | // * * |
---|
5 | // * The Geant4 software is copyright of the Copyright Holders of * |
---|
6 | // * the Geant4 Collaboration. It is provided under the terms and * |
---|
7 | // * conditions of the Geant4 Software License, included in the file * |
---|
8 | // * LICENSE and available at http://cern.ch/geant4/license . These * |
---|
9 | // * include a list of copyright holders. * |
---|
10 | // * * |
---|
11 | // * Neither the authors of this software system, nor their employing * |
---|
12 | // * institutes,nor the agencies providing financial support for this * |
---|
13 | // * work make any representation or warranty, express or implied, * |
---|
14 | // * regarding this software system or assume any liability for its * |
---|
15 | // * use. Please see the license in the file LICENSE and URL above * |
---|
16 | // * for the full disclaimer and the limitation of liability. * |
---|
17 | // * * |
---|
18 | // * This code implementation is the result of the scientific and * |
---|
19 | // * technical work of the GEANT4 collaboration. * |
---|
20 | // * By using, copying, modifying or distributing the software (or * |
---|
21 | // * any work based on the software) you agree to acknowledge its * |
---|
22 | // * use in resulting scientific publications, and indicate your * |
---|
23 | // * acceptance of all terms of the Geant4 Software license. * |
---|
24 | // ******************************************************************** |
---|
25 | // |
---|
26 | // |
---|
27 | // $Id: G4LinInterpolation.cc,v 1.5 2009/09/25 07:41:34 sincerti Exp $ |
---|
28 | // GEANT4 tag $Name: geant4-09-03 $ |
---|
29 | // |
---|
30 | // Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch) |
---|
31 | // |
---|
32 | // History: |
---|
33 | // ----------- |
---|
34 | // 31 Jul 2001 MGP Created |
---|
35 | // 14 JUn 2009 NAK New Calculation method implemented to which logarithmic values |
---|
36 | // from the G4EMLOW dataset are loaded directly to enhance performance |
---|
37 | // |
---|
38 | // ------------------------------------------------------------------- |
---|
39 | |
---|
40 | #include "G4LinInterpolation.hh" |
---|
41 | |
---|
42 | // Constructor |
---|
43 | |
---|
44 | G4LinInterpolation::G4LinInterpolation() |
---|
45 | { } |
---|
46 | |
---|
47 | // Destructor |
---|
48 | |
---|
49 | G4LinInterpolation::~G4LinInterpolation() |
---|
50 | { } |
---|
51 | |
---|
52 | |
---|
53 | G4VDataSetAlgorithm* G4LinInterpolation::Clone() const |
---|
54 | { return new G4LinInterpolation; } |
---|
55 | |
---|
56 | G4double G4LinInterpolation::Calculate(G4double x, G4int bin, |
---|
57 | const G4DataVector& points, |
---|
58 | const G4DataVector& data) const |
---|
59 | { |
---|
60 | //G4cout << "G4LinInterpolation is performed (2 arguments)" << G4endl; |
---|
61 | G4int nBins = data.size() - 1; |
---|
62 | G4double value = 0.; |
---|
63 | if (x < points[0]) |
---|
64 | { |
---|
65 | value = 0.; |
---|
66 | } |
---|
67 | else if (bin < nBins) |
---|
68 | { |
---|
69 | G4double e1 = points[bin]; |
---|
70 | G4double e2 = points[bin+1]; |
---|
71 | G4double d1 = data[bin]; |
---|
72 | G4double d2 = data[bin+1]; |
---|
73 | value = d1 + (d2 - d1)*(x - e1)/(e2 - e1); |
---|
74 | } |
---|
75 | else |
---|
76 | { |
---|
77 | value = data[nBins]; |
---|
78 | } |
---|
79 | return value; |
---|
80 | } |
---|
81 | |
---|
82 | |
---|
83 | //Nicolas A. Karakatsanis: New Calculation method implemented to which logarithmic values |
---|
84 | // from the G4EMLOW dataset are loaded directly to enhance performance |
---|
85 | |
---|
86 | G4double G4LinInterpolation::Calculate(G4double x, G4int bin, |
---|
87 | const G4DataVector& points, |
---|
88 | const G4DataVector& data, |
---|
89 | const G4DataVector& log_points, |
---|
90 | const G4DataVector& log_data) const |
---|
91 | { |
---|
92 | //Linear Interpolation is performed on loagarithmic data set |
---|
93 | //Equivalent to log-log interpolation on non-loagarithmic data set |
---|
94 | //G4cout << "G4LinInterpolation is performed - (4 arguments)" << G4endl; |
---|
95 | G4int nBins = data.size() - 1; |
---|
96 | G4double value = 0.; |
---|
97 | G4double log_x = std::log10(x); |
---|
98 | if (x < points[0]) |
---|
99 | { |
---|
100 | value = 0.; |
---|
101 | } |
---|
102 | else if (bin < nBins) |
---|
103 | { |
---|
104 | G4double log_e1 = log_points[bin]; |
---|
105 | G4double log_e2 = log_points[bin+1]; |
---|
106 | G4double log_d1 = log_data[bin]; |
---|
107 | G4double log_d2 = log_data[bin+1]; |
---|
108 | |
---|
109 | // Values e1, e2, d1 and d2 are the log values of the corresponding |
---|
110 | // original energy and data values. Simple linear interpolation performed |
---|
111 | // on loagarithmic data should be equivalent to log-log interpolation |
---|
112 | value = log_d1 + (log_d2 - log_d1)*(log_x - log_e1)/(log_e2 - log_e1); |
---|
113 | |
---|
114 | // Delogarithmize to obtain interpolated value |
---|
115 | value = std::pow(10.,value); |
---|
116 | } |
---|
117 | else |
---|
118 | { |
---|
119 | value = data[nBins]; |
---|
120 | } |
---|
121 | return value; |
---|
122 | } |
---|