G4TsitourasRK45.hh

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
//
//  G4TsitourasRK45.hh
//  Geant4
//
//  Created by hackabot on 11/06/15.
//
//

#ifndef Tsitouras_RK45
#define Tsitouras_RK45

#include "G4MagIntegratorStepper.hh"

class G4TsitourasRK45 : public G4MagIntegratorStepper
{
public:
    G4TsitourasRK45(G4EquationOfMotion *EqRhs,
                     G4int numberOfVariables = 6,
                     G4bool primary =  true);
    ~G4TsitourasRK45();

    void Stepper( const G4double y[],
                  const G4double dydx[],
                        G4double h,
                        G4double yout[],
                        G4double yerr[] ) ;
    
    void SetupInterpolation( /* const G4double yInput[],
                              const G4double dydx[],
                              const G4double Step */  );
    
    //For calculating the output at the tau fraction of Step
    void Interpolate( const G4double yInput[],
                         const G4double dydx[],
                         const G4double Step,
                         G4double yOut[],
                         G4double tau );
    
    
    void interpolate( const G4double yInput[],
                      const G4double dydx[],
                            G4double yOut[],
                            G4double Step,
                            G4double tau);

    G4double  DistChord()   const;
    G4int IntegratorOrder() const {return 4; }
    
//    G4double *getLastDydx();
    
private :
    
    G4TsitourasRK45(const G4TsitourasRK45&);
    G4TsitourasRK45& operator=(const G4TsitourasRK45&);
    
    G4double *ak2, *ak3, *ak4, *ak5, *ak6, *ak7, *ak8, *yTemp, *yIn;
    
    G4double fLastStepLength;
    G4double *fLastInitialVector, *fLastFinalVector,
    *fLastDyDx, *fMidVector, *fMidError;
    // for DistChord calculations
    
    G4TsitourasRK45* fAuxStepper;
};



#endif /* defined(__Geant4__G4TsitourasRK45__) */