130 lines
5.1 KiB
C++
130 lines
5.1 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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// G4DormandPrinceRK56
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//
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// Class description:
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//
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// Dormand-Prince RK 6(5) non-FSAL method
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// Created: Somnath Banerjee, Google Summer of Code 2015, 26 June 2015
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// Supervision: John Apostolakis, CERN
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// --------------------------------------------------------------------
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#ifndef G4DORMAND_PRINCE_RK56_HH
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#define G4DORMAND_PRINCE_RK56_HH
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#include "G4MagIntegratorStepper.hh"
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class G4DormandPrinceRK56 : public G4MagIntegratorStepper
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{
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public:
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G4DormandPrinceRK56( G4EquationOfMotion* EqRhs,
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G4int numberOfVariables = 6,
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G4bool primary = true ) ;
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~G4DormandPrinceRK56() ;
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G4DormandPrinceRK56(const G4DormandPrinceRK56&) = delete;
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G4DormandPrinceRK56& operator=(const G4DormandPrinceRK56&) = 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 DistChord() const;
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G4int IntegratorOrder() const { return 5; }
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void SetupInterpolate_low( const G4double yInput[],
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const G4double dydx[],
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const G4double Step );
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// For preparing the Interpolant and calculating the extra stages
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void Interpolate_low( const G4double yInput[],
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const G4double dydx[],
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const G4double Step,
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G4double yOut[],
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G4double tau );
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// For calculating the output at the tau fraction of Step
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inline void SetupInterpolation()
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{
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SetupInterpolate( fLastInitialVector, fLastDyDx, fLastStepLength);
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}
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inline void SetupInterpolate( const G4double yInput[],
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const G4double dydx[],
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const G4double Step )
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{
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SetupInterpolate_low( yInput, dydx, Step);
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}
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inline void Interpolate( const G4double yInput[],
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const G4double dydx[],
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const G4double Step,
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G4double yOut[],
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G4double tau )
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{
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Interpolate_low( yInput, dydx, Step, yOut, tau);
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}
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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[])
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{
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Interpolate( fLastInitialVector, fLastDyDx, fLastStepLength, yOut, tau );
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}
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void SetupInterpolate_high( const G4double yInput[],
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const G4double dydx[],
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const G4double Step );
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void Interpolate_high( const G4double yInput[],
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const G4double dydx[],
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const G4double Step,
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G4double yOut[],
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G4double tau );
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// For calculating the output at the tau fraction of Step
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private:
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G4double *ak2, *ak3, *ak4, *ak5, *ak6, *ak7, *ak8, *ak9;
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// For storing intermediate 'k' values in stepper
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G4double *ak10_low, *ak10, *ak11, * ak12;
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// For the additional stages of Interpolant
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G4double *yTemp, *yIn;
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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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G4DormandPrinceRK56* fAuxStepper = nullptr;
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};
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#endif /* G4DormandPrinceRK56 */
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