Geant4 Cross Reference

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Geant4/geometry/magneticfield/include/G4TsitourasRK45.hh

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  1 //
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 25 //
 26 // G4TsitourasRK45
 27 //
 28 // Class description:
 29 //
 30 // Tsitouras - 5(4) RK stepper (non-FSAL version)
 31 // Implements RK tableau from 'Table 1' of:
 32 //    C. Tsitouras, "Runge-Kutta pairs of order 5(4) satisfying only
 33 //    the first column simplifying assumption"
 34 //    Computers & Mathematics with Applications,
 35 //    vol. 62, no. 2, pp. 770-775, 2011.
 36 
 37 // Author: Somnath Banerjee, Google Summer of Code 2015, 11.06.2015
 38 // Supervision: John Apostolakis, CERN
 39 // --------------------------------------------------------------------
 40 #ifndef TSITOURAS_RK45_HH
 41 #define TSITOURAS_RK45_HH
 42 
 43 #include "G4MagIntegratorStepper.hh"
 44 
 45 class G4TsitourasRK45 : public G4MagIntegratorStepper
 46 {
 47   public:
 48 
 49     G4TsitourasRK45(G4EquationOfMotion* EqRhs,
 50                     G4int numberOfVariables = 6,
 51                     G4bool primary =  true);
 52    ~G4TsitourasRK45() override;
 53 
 54     G4TsitourasRK45(const G4TsitourasRK45&) = delete;
 55     G4TsitourasRK45& operator=(const G4TsitourasRK45&) = delete;
 56     
 57     void Stepper( const G4double y[],
 58                   const G4double dydx[],
 59                         G4double h,
 60                         G4double yout[],
 61                         G4double yerr[] ) override;
 62     
 63     void SetupInterpolation( /* const G4double yInput[],
 64                               const G4double dydx[],
 65                               const G4double Step */  );
 66     
 67     void Interpolate( const G4double yInput[],
 68                       const G4double dydx[],
 69                       const G4double Step,
 70                             G4double yOut[],
 71                             G4double tau );
 72       // For calculating the output at the tau fraction of Step
 73 
 74     void interpolate( const G4double yInput[],
 75                       const G4double dydx[],
 76                             G4double yOut[],
 77                             G4double Step,
 78                             G4double tau);
 79 
 80     G4double DistChord() const override;
 81     inline G4int IntegratorOrder() const override { return 4; }
 82     
 83   private :
 84     
 85     G4double *ak2, *ak3, *ak4, *ak5, *ak6, *ak7, *ak8, *yTemp, *yIn;
 86     
 87     G4double fLastStepLength = 0.0;
 88     G4double *fLastInitialVector, *fLastFinalVector,
 89              *fLastDyDx, *fMidVector, *fMidError;
 90       // For DistChord calculations
 91     
 92     G4TsitourasRK45* fAuxStepper = nullptr;
 93 };
 94 
 95 #endif
 96