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G4LinInterpolation.cc
Go to the documentation of this file.
Or view
the newest version in sPHENIX GitHub for file G4LinInterpolation.cc
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//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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//
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//
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// Author: Maria Grazia Pia (Maria.Grazia.Pia@cern.ch)
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//
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// History:
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// -----------
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// 31 Jul 2001 MGP Created
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// 14 JUn 2009 NAK New Calculation method implemented to which logarithmic values
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// from the G4EMLOW dataset are loaded directly to enhance performance
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//
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// -------------------------------------------------------------------
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#include "
G4LinInterpolation.hh
"
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// Constructor
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G4LinInterpolation::G4LinInterpolation
()
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{ }
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// Destructor
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G4LinInterpolation::~G4LinInterpolation
()
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{ }
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G4VDataSetAlgorithm
*
G4LinInterpolation::Clone
()
const
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{
return
new
G4LinInterpolation
; }
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G4double
G4LinInterpolation::Calculate
(
G4double
x
,
G4int
bin
,
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const
G4DataVector
& points,
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const
G4DataVector
&
data
)
const
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{
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//G4cout << "G4LinInterpolation is performed (2 arguments)" << G4endl;
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G4int
nBins = data.size() - 1;
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G4double
value
= 0.;
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if
(x < points[0])
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{
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value = 0.;
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}
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else
if
(bin < nBins)
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{
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G4double
e1
= points[
bin
];
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G4double
e2
= points[bin+1];
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G4double
d1
= data[
bin
];
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G4double
d2
= data[bin+1];
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value = d1 + (d2 -
d1
)*(x - e1)/(e2 -
e1
);
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}
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else
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{
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value = data[nBins];
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}
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return
value
;
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}
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//Nicolas A. Karakatsanis: New Calculation method implemented to which logarithmic values
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// from the G4EMLOW dataset are loaded directly to enhance performance
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G4double
G4LinInterpolation::Calculate
(
G4double
x
,
G4int
bin
,
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const
G4DataVector
& points,
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const
G4DataVector
&
data
,
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const
G4DataVector
& log_points,
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const
G4DataVector
& log_data)
const
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{
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//Linear Interpolation is performed on loagarithmic data set
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//Equivalent to log-log interpolation on non-loagarithmic data set
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//G4cout << "G4LinInterpolation is performed - (4 arguments)" << G4endl;
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G4int
nBins = data.size() - 1;
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G4double
value
= 0.;
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G4double
log_x = std::log10(x);
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if
(x < points[0])
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{
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value = 0.;
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}
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else
if
(bin < nBins)
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{
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G4double
log_e1 = log_points[
bin
];
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G4double
log_e2 = log_points[bin+1];
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G4double
log_d1 = log_data[
bin
];
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G4double
log_d2 = log_data[bin+1];
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// Values e1, e2, d1 and d2 are the log values of the corresponding
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// original energy and data values. Simple linear interpolation performed
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// on loagarithmic data should be equivalent to log-log interpolation
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value = log_d1 + (log_d2 - log_d1)*(log_x - log_e1)/(log_e2 - log_e1);
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// Delogarithmize to obtain interpolated value
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value = std::pow(10.,value);
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}
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else
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{
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value = data[nBins];
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}
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return
value
;
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}
geant4
tree
geant4-10.6-release
source
processes
electromagnetic
lowenergy
src
G4LinInterpolation.cc
Built by
Jin Huang
. updated:
Wed Jun 29 2022 17:25:32
using
1.8.2 with
ECCE GitHub integration