Gabriele Cosmo
92 lines
3.6 KiB
C++
92 lines
3.6 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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// G4FSALBogackiShampine45
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//
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// Class description:
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//
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// Bogacki-Shampine - 8 - 5(4) FSAL stepper
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// Created: Somnath Banerjee, Google Summer of Code 2015, 26 May 2015
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// Supervision: John Apostolakis, CERN
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// --------------------------------------------------------------------
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#ifndef G4FSAL_BOGACKI_SHAMPINE_45_HH
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#define G4FSAL_BOGACKI_SHAMPINE_45_HH
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#include "G4VFSALIntegrationStepper.hh"
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class G4FSALBogackiShampine45 : public G4VFSALIntegrationStepper
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{
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public:
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G4FSALBogackiShampine45(G4EquationOfMotion* EqRhs,
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G4int numberOfVariables = 6,
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G4bool primary = true);
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~G4FSALBogackiShampine45();
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G4FSALBogackiShampine45(const G4FSALBogackiShampine45&) = delete;
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G4FSALBogackiShampine45& operator=(const G4FSALBogackiShampine45&) = delete;
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void Stepper( const G4double y[],
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const G4double dydx[],
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G4double h,
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G4double yout[],
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G4double yerr[],
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G4double nextDydx[]) ;
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void interpolate( const G4double yInput[],
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const G4double dydx[],
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G4double yOut[],
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G4double Step,
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G4double tau ) ;
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G4double DistChord() const;
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inline G4int IntegratorOrder() const { return 4; }
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private :
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void PrepareConstants();
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// Working arrays -- used during stepping
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//
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G4double *ak2, *ak3, *ak4, *ak5, *ak6, *ak7, *ak8, *ak9, *ak10, *ak11,
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*DyDx, *yTemp, *yIn;
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G4double *pseudoDydx_for_DistChord;
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G4double fLastStepLength = -1.0;
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G4double *fLastInitialVector, *fLastFinalVector,
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*fLastDyDx, *fMidVector, *fMidError;
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// for DistChord calculations
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G4double b[12]; // Working array for interpolation
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G4FSALBogackiShampine45* fAuxStepper = nullptr;
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static G4bool fPreparedConstants;
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static G4double bi[12][7];
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};
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#endif
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