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Geant4/geometry/magneticfield/include/G4FSALDormandPrince745.hh

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 25 //
 26 // G4FSALDormandPrince745
 27 //
 28 // Class description:
 29 //
 30 // DormandPrince7 - 5(4) FSAL stepper
 31 
 32 // Created: Somnath Banerjee, Google Summer of Code 2015, 25 May 2015
 33 // Supervision: John Apostolakis, CERN
 34 // --------------------------------------------------------------------
 35 #ifndef G4FSALDORMANDPRINCE745_HH
 36 #define G4FSALDORMANDPRINCE745_HH
 37 
 38 #include "G4VFSALIntegrationStepper.hh"
 39 
 40 class G4FSALDormandPrince745 : public G4VFSALIntegrationStepper
 41 {
 42   public:
 43 
 44     G4FSALDormandPrince745(G4EquationOfMotion* EqRhs,
 45                            G4int numberOfVariables = 6,
 46                            G4bool primary = true);
 47    ~G4FSALDormandPrince745() override;
 48 
 49     G4FSALDormandPrince745(const G4FSALDormandPrince745&) = delete;
 50     G4FSALDormandPrince745& operator=(const G4FSALDormandPrince745&) = delete;
 51 
 52     void Stepper( const G4double y[],
 53                   const G4double dydx[],
 54                         G4double h,
 55                         G4double yout[],
 56                         G4double yerr[],
 57                         G4double nextDydx[]) override ;
 58     void interpolate( const G4double yInput[],
 59                       const G4double dydx[],
 60                             G4double yOut[],
 61                             G4double Step,
 62                             G4double tau ) ;
 63 
 64     void SetupInterpolate( const G4double yInput[],
 65                            const G4double dydx[],
 66                            const G4double Step );
 67       // For higher order Interpolant
 68     
 69     void Interpolate( const G4double yInput[],
 70                       const G4double dydx[],
 71                       const G4double Step,
 72                             G4double yOut[],
 73                             G4double tau );
 74       // For calculating the output at the tau fraction of Step
 75     
 76 
 77     G4double  DistChord()   const override;
 78     inline G4int IntegratorOrder() const override { return 4; }
 79     inline G4bool isFSAL() const { return true; }
 80     
 81   private:
 82     
 83     G4double *ak2, *ak3, *ak4, *ak5, *ak6, *ak7,
 84              *ak8, *ak9,         // For additional stages in the interpolant
 85              *yTemp, *yIn;
 86     
 87     G4double* pseudoDydx_for_DistChord;
 88       // Only for use with DistChord()
 89     
 90     G4double fLastStepLength = -1.0;
 91     G4double *fLastInitialVector, *fLastFinalVector,
 92              *fInitialDyDx, *fLastDyDx, *fMidVector, *fMidError;
 93       // For DistChord() calculations
 94     
 95     G4FSALDormandPrince745* fAuxStepper = nullptr;
 96 };
 97 
 98 #endif
 99