Gabriele Cosmo
102 lines
4.1 KiB
C++
102 lines
4.1 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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// G4DormandPrince745
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//
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// Class desription:
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//
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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 Math., 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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// Created: Somnath Banerjee, Google Summer of Code 2015, 25 May 2015
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// Supervision: John Apostolakis, CERN
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// --------------------------------------------------------------------
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#ifndef G4DORMAND_PRINCE_745_HH
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#define G4DORMAND_PRINCE_745_HH
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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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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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// For calculating the output at the tau fraction of Step
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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 G4String& StepperType() const { return gStepperType; }
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const G4String& StepperDescription() const { return gStepperDescription; }
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const field_utils::State& GetYOut() const { return fyOut; }
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void Interpolate4thOrder(G4double yOut[], G4double tau) const;
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void SetupInterpolation5thOrder();
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void Interpolate5thOrder(G4double yOut[], G4double tau) const;
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G4EquationOfMotion* GetSpecificEquation() { return GetEquationOfMotion(); }
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private:
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// Name and description of this steppers - plus details of its implementation
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static const G4String gStepperType;
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static const G4String gStepperDescription;
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// const unsigned int fIntegratorOrder = 4; // Should it not be 5 ?
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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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