Gabriele Cosmo
68 lines
3.3 KiB
C++
68 lines
3.3 KiB
C++
//
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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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// File: G4BetaSpectrumSampler.hh //
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// Author: D.H. Wright //
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// Date: 21 November 2022 //
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// Description: samples a spectrum which is a piece-wise linear function of //
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// energy. The CDF is calculated by trapezoidal integration //
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// and within bins the line y = mx + b is sampled. //
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// //
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////////////////////////////////////////////////////////////////////////////////
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#ifndef G4BetaSpectrumSampler_h
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#define G4BetaSpectrumSampler_h 1
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#include "globals.hh"
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#include "Randomize.hh"
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#include <vector>
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class G4BetaSpectrumSampler
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{
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public:
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G4BetaSpectrumSampler(const G4double* aPDF, G4int pdfSize, G4double e);
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~G4BetaSpectrumSampler() = default;
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G4double shoot();
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private:
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G4double sampleSlopedLine(); // Method to sample under sloped line
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std::vector<double> pdf; // Spectrum shape
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std::vector<double> cdf; // Cumulative distribution function
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G4double eEnd; // Endpoint energy of spectrum
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G4int nBins; // Number of lower bin edges in spectrum
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G4int lowerBinEdge; // Index of lower bin edge
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G4int upperBinEdge; // Index of upper bin edge
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G4double ylower{0.0}; // Value at lower bin edge
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G4double yupper{0.0}; // Value at upper bin edge
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};
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#endif
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