Gabriele Cosmo
99 lines
3.9 KiB
C++
99 lines
3.9 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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// Class desription:
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// An implementation of the 5th order embedded RK method from the paper
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// J. R. Dormand and P. J. Prince, “A family of embedded Runge-Kutta formulae,”
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// Journal of computational and applied …, vol. 6, no. 1, pp. 19–26, 1980.
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//
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// DormandPrince7 - 5(4) embedded RK method
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//
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// Design & Implementation by Somnath Banerjee
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// Supervision & code review: John Apostolakis
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//
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// Work supported by the Google Summer of Code 2015.
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//
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// History
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// ------------------------------------------
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// Created : 25 May 2015. - Somnath
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// Revisions :
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// * 29 June 2015: Added interpolate() method(s) - Somnath
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// * May 2016: Cleanup and first comming in G4 - John Apostolakis
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// * 4 June 2019: Cleanup and add FSAL method
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#ifndef DORMAND_PRINCE_745
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#define DORMAND_PRINCE_745
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#include "G4MagIntegratorStepper.hh"
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#include "G4FieldUtils.hh"
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class G4DormandPrince745 : public G4MagIntegratorStepper
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{
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public:
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G4DormandPrince745(G4EquationOfMotion* equation,
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G4int numberOfVariables = 6);
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virtual void Stepper(const G4double yInput[],
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const G4double dydx[],
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G4double hstep,
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G4double yOutput[],
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G4double yError[]) override;
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void Stepper(const G4double yInput[],
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const G4double dydx[],
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G4double hstep,
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G4double yOutput[],
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G4double yError[],
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G4double dydxOutput[]);
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inline void SetupInterpolation() {}
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//For calculating the output at the tau fraction of Step
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inline void Interpolate(G4double tau, G4double yOut[]) const
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{
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Interpolate4thOrder(yOut, tau);
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}
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virtual G4double DistChord() const override;
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virtual G4int IntegratorOrder() const override { return 4; }
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const field_utils::State& GetYOut() const { return fyOut; }
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private:
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void Interpolate4thOrder(G4double yOut[], G4double tau) const;
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void SetupInterpolation_high();
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void Interpolate_high(G4double yOut[], G4double tau);
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field_utils::State ak2, ak3, ak4, ak5, ak6, ak7, ak8, ak9;
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field_utils::State fyIn, fyOut, fdydxIn;
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G4double fLastStepLength = -1.0;
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};
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#endif
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