Geant4 Cross Reference

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Geant4/geometry/magneticfield/include/G4DoLoMcPriRK34.hh

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 25 //
 26 // G4DoLoMcPriRK34
 27 //
 28 // Class description:
 29 //
 30 //  Dormand-Lockyer-McGorrigan-Prince-6-3-4 non-FSAL method
 31 //  ( 6 stage, 3rd & 4th order embedded RK method )
 32 
 33 // Created: Somnath Banerjee, Google Summer of Code 2015, 7 July 2015
 34 // Supervision: John Apostolakis, CERN
 35 // --------------------------------------------------------------------
 36 #ifndef DOLO_MCPRI_RK34_HH
 37 #define DOLO_MCPRI_RK34_HH
 38 
 39 #include "G4MagIntegratorStepper.hh"
 40 
 41 class G4DoLoMcPriRK34 : public G4MagIntegratorStepper
 42 {
 43   public:
 44 
 45     G4DoLoMcPriRK34( G4EquationOfMotion* EqRhs,
 46                      G4int numberOfVariables = 6,
 47                      G4bool primary = true );
 48       // Constructor using Equation
 49 
 50     ~G4DoLoMcPriRK34() override;
 51 
 52     G4DoLoMcPriRK34(const G4DoLoMcPriRK34&) = delete;
 53     G4DoLoMcPriRK34& operator=(const G4DoLoMcPriRK34&) = delete; 
 54       // Copy constructor and assignment operator not allowed
 55 
 56     void Stepper( const G4double y[],
 57                   const G4double dydx[],
 58                         G4double h,
 59                         G4double yout[],
 60                         G4double yerr[] ) override ;
 61     
 62     void SetupInterpolation();
 63     void SetupInterpolate( const G4double yInput[],
 64                            const G4double dydx[],
 65                            const G4double Step );
 66       // For Preparing the interpolation and calculating the extra stages
 67     
 68     void Interpolate( const G4double yInput[],
 69                       const G4double dydx[],
 70                       const G4double Step,
 71                             G4double yOut[],
 72                             G4double tau );
 73       // For calculating the output at the tau fraction of Step
 74 
 75     void Interpolate( G4double tau,
 76                       G4double yOut[]);
 77     
 78     void interpolate(const G4double yInput[],
 79                      const G4double dydx[],
 80                            G4double yOut[],
 81                            G4double Step,
 82                            G4double tau ) ;
 83 
 84     G4double DistChord() const override;
 85     G4int IntegratorOrder() const override { return 3; }
 86     
 87   private :
 88     
 89     G4double *ak2, *ak3, *ak4, *ak5, *ak6, *yTemp, *yIn;
 90     
 91     G4double fLastStepLength = -1.0;
 92     G4double *fLastInitialVector, *fLastFinalVector,
 93              *fLastDyDx, *fMidVector, *fMidError;
 94       // for DistChord calculations
 95     
 96     G4DoLoMcPriRK34* fAuxStepper = nullptr;
 97 };
 98 
 99 #endif
100