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G4MagIntegratorStepper.hh
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26 // $Id: G4MagIntegratorStepper.hh 107059 2017-11-01 14:58:16Z gcosmo $
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28 //
29 // class G4MagIntegratorStepper
30 //
31 // Class description:
32 //
33 // Abstract base class for integrator of particle's equation of motion,
34 // used in tracking in space dependent magnetic field
35 //
36 // A Stepper must integrate over NumberOfVariables elements,
37 // and also copy (from input to output) any of NoStateVariables
38 // not included in the NumberOfVariables.
39 //
40 // So it is expected that NoStateVariables >= NumberOfVariables
41 
42 // History:
43 // - 15.01.97 J. Apostolakis (J.Apostolakis@cern.ch)
44 // --------------------------------------------------------------------
45 
46 #ifndef G4MAGIntegratorSTEPPER
47 #define G4MAGIntegratorSTEPPER
48 
49 #include "G4Types.hh"
50 #include "G4EquationOfMotion.hh"
51 
53 {
54  public: // with description
55 
57  G4int numIntegrationVariables,
58  G4int numStateVariables=12,
59  bool isFSAL= false
60  // , G4int methodOrder
61  );
62  virtual ~G4MagIntegratorStepper();
63  // Constructor and destructor. No actions.
64 
65  virtual void Stepper( const G4double y[],
66  const G4double dydx[],
67  G4double h,
68  G4double yout[],
69  G4double yerr[] ) = 0 ;
70  // The stepper for the Runge Kutta integration.
71  // The stepsize is fixed, with the Step size given by h.
72  // Integrates ODE starting values y[0 to 6].
73  // Outputs yout[] and its estimated error yerr[].
74 
75  virtual G4double DistChord() const = 0;
76  // Estimate the maximum distance of a chord from the true path
77  // over the segment last integrated.
78 
79  virtual void ComputeRightHandSide( const G4double y[], G4double dydx[] );
80  // Must compute the RightHandSide as in the method below
81  // Optionally can cache the input y[] and the dydx[] values computed.
82 
83  inline void NormaliseTangentVector( G4double vec[6] );
84  // Simple utility function to (re)normalise 'unit velocity' vector.
85 
86  inline void NormalisePolarizationVector( G4double vec[12] );
87  // Simple utility function to (re)normalise 'unit spin' vector.
88 
89  inline void RightHandSide( const double y[], double dydx[] ) const;
90  // Utility method to supply the standard Evaluation of the
91  // Right Hand side of the associated equation.
92 
93  inline G4int GetNumberOfVariables() const;
94  // Get the number of variables that the stepper will integrate over.
95 
96  inline G4int GetNumberOfStateVariables() const;
97  // Get the number of variables of state variables (>= above, integration)
98 
99  virtual G4int IntegratorOrder() const = 0;
100  // Returns the order of the integrator
101  // i.e. its error behaviour is of the order O(h^order).
102 
104  // Replacement method - using new data member
105 
107  // As some steppers (eg RKG3) require other methods of Eq_Rhs
108  // this function allows for access to them.
109  inline void SetEquationOfMotion(G4EquationOfMotion* newEquation);
110 
111  inline unsigned long GetfNoRHSCalls(){ return fNoRHSCalls; }
112  // void IncrementRHSCalls() { fNoRHSCalls++; }
113  inline void ResetfNORHSCalls(){ fNoRHSCalls = 0; }
114  // Count number of calls to RHS method(s)
115 
116  bool IsFSAL() const { return fIsFSAL; }
117 
118  protected:
119  void SetIntegrationOrder(int order) { fIntegrationOrder= order; }
120  void SetFSAL( bool flag= true) { fIsFSAL= flag; }
121 
122  private:
123 
126  // Private copy constructor and assignment operator.
127 
128  private:
129 
131  const G4int fNoIntegrationVariables; // Number of Variables in integration
132  const G4int fNoStateVariables; // Number required for FieldTrack
133  // const G4int fNumberOfVariables;
134 
135  // Counter for calls to RHS method
136  mutable unsigned long fNoRHSCalls;
137 
138  // Parameters of a RK method -- must be shared by all steppers of a type
139  // -- Invariants for a class
140  /* const */ int fIntegrationOrder; // all ClassicalRK4 steppers are 4th order
141  /* const */ bool fIsFSAL; // Depends on RK method & implementation
142 };
143 
144 #include "G4MagIntegratorStepper.icc"
145 
146 #endif /* G4MAGIntegratorSTEPPER */
G4EquationOfMotion * GetEquationOfMotion()
void SetEquationOfMotion(G4EquationOfMotion *newEquation)
void NormaliseTangentVector(G4double vec[6])
Float_t y
Definition: compare.C:6
G4MagIntegratorStepper & operator=(const G4MagIntegratorStepper &)
virtual G4double DistChord() const =0
G4MagIntegratorStepper(G4EquationOfMotion *Equation, G4int numIntegrationVariables, G4int numStateVariables=12, bool isFSAL=false)
double G4double
Definition: G4Types.hh:76
G4int GetNumberOfStateVariables() const
G4EquationOfMotion * fEquation_Rhs
void RightHandSide(const double y[], double dydx[]) const
virtual void ComputeRightHandSide(const G4double y[], G4double dydx[])
int G4int
Definition: G4Types.hh:78
virtual void Stepper(const G4double y[], const G4double dydx[], G4double h, G4double yout[], G4double yerr[])=0
void NormalisePolarizationVector(G4double vec[12])
G4int GetNumberOfVariables() const
void SetFSAL(bool flag=true)
virtual G4int IntegratorOrder() const =0