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Geant4/geometry/magneticfield/include/G4FSALBogackiShampine45.hh

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 25 //
 26 // G4FSALBogackiShampine45
 27 //
 28 // Class description:
 29 //
 30 // Bogacki-Shampine - 8 - 5(4) FSAL stepper
 31 
 32 // Created: Somnath Banerjee, Google Summer of Code 2015, 26 May 2015
 33 // Supervision: John Apostolakis, CERN
 34 // --------------------------------------------------------------------
 35 #ifndef G4FSAL_BOGACKI_SHAMPINE_45_HH
 36 #define G4FSAL_BOGACKI_SHAMPINE_45_HH
 37 
 38 #include "G4VFSALIntegrationStepper.hh"
 39 
 40 class G4FSALBogackiShampine45 : public G4VFSALIntegrationStepper
 41 {
 42   public:
 43 
 44     G4FSALBogackiShampine45(G4EquationOfMotion* EqRhs,
 45                             G4int numberOfVariables = 6,
 46                             G4bool primary = true);
 47    ~G4FSALBogackiShampine45() override;
 48     
 49     G4FSALBogackiShampine45(const G4FSALBogackiShampine45&) = delete;
 50     G4FSALBogackiShampine45& operator=(const G4FSALBogackiShampine45&) = 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     
 59     void interpolate( const G4double yInput[],
 60                       const G4double dydx[],
 61                             G4double yOut[],
 62                             G4double Step,
 63                             G4double tau ) ;
 64 
 65     G4double DistChord() const override;
 66     inline G4int IntegratorOrder() const override { return 4; }
 67     
 68   private:
 69     
 70     void PrepareConstants(); 
 71    
 72     // Working arrays -- used during stepping
 73     //
 74     G4double *ak2, *ak3, *ak4, *ak5, *ak6, *ak7, *ak8, *ak9, *ak10, *ak11,
 75              *DyDx, *yTemp, *yIn;
 76     G4double *pseudoDydx_for_DistChord;
 77 
 78     G4double fLastStepLength = -1.0;
 79     G4double *fLastInitialVector, *fLastFinalVector,
 80              *fLastDyDx, *fMidVector, *fMidError;
 81     // for DistChord calculations
 82 
 83     G4double b[12];     // Working array for interpolation
 84    
 85     G4FSALBogackiShampine45* fAuxStepper = nullptr;
 86 
 87     static G4bool fPreparedConstants;
 88     static G4double bi[12][7];
 89 };
 90 
 91 #endif
 92