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Geant4/geometry/magneticfield/include/G4DormandPrinceRK78.hh

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 25 //
 26 // G4DormandPrinceRK78
 27 //
 28 // Class description:
 29 //
 30 // Dormand-Prince 8(7)13M non-FSAL RK method, a 13 stage embedded
 31 // explicit Runge-Kutta method, using a pair of 7th and 8th order formulae.
 32 //
 33 // Paper proposing this RK scheme:
 34 // P.J. Prince, J.R. Dormand, "High order embedded Runge-Kutta formulae",
 35 // Journal of Computational and Applied Mathematics, Volume 7, Issue 1, 1981,
 36 // Pages 67-75, ISSN 0377-0427, DOI: 10.1016/0771-050X(81)90010-3
 37 
 38 // Created: Somnath Banerjee, Google Summer of Code 2015, 28 June 2015
 39 // Supervision: John Apostolakis, CERN
 40 // --------------------------------------------------------------------
 41 #ifndef G4DORMAND_PRINCE_RK78_HH
 42 #define G4DORMAND_PRINCE_RK78_HH
 43 
 44 #include "G4MagIntegratorStepper.hh"
 45 
 46 class G4DormandPrinceRK78 : public G4MagIntegratorStepper
 47 {
 48   public:
 49 
 50     G4DormandPrinceRK78(G4EquationOfMotion* EqRhs,
 51                         G4int numberOfVariables = 6,
 52                         G4bool primary = true);
 53     ~G4DormandPrinceRK78() override;
 54     
 55     G4DormandPrinceRK78(const G4DormandPrinceRK78&) = delete;
 56     G4DormandPrinceRK78& operator=(const G4DormandPrinceRK78&) = delete;
 57 
 58     void Stepper( const G4double y[],
 59                   const G4double dydx[],
 60                         G4double h,
 61                         G4double yout[],
 62                         G4double yerr[]) override ;
 63 
 64     G4double  DistChord() const override;
 65     inline G4int IntegratorOrder() const override { return 7; }
 66     
 67  private :  
 68     
 69     G4double *ak2,   *ak3,  *ak4,  *ak5,  *ak6,  *ak7, *ak8,
 70              *ak9,   *ak10, *ak11, *ak12, *ak13,
 71              *yTemp, *yIn;
 72 
 73     G4double fLastStepLength = -1.0;
 74     G4double *fLastInitialVector, *fLastFinalVector,
 75              *fLastDyDx, *fMidVector, *fMidError;
 76       // For DistChord calculations
 77 
 78     G4DormandPrinceRK78* fAuxStepper = nullptr;
 79 };
 80 
 81 #endif
 82