Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/magneticfield/include/G4ImplicitEuler.hh

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  1 //
  2 // ********************************************************************
  3 // * License and Disclaimer                                           *
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 25 //
 26 // G4ImplicitEuler
 27 //
 28 // Class description:
 29 //
 30 // Implicit Euler stepper for magnetic field:
 31 //      x_1 = x_0 + h/2 * ( dx(t_0,x_0) + dx(t_0+h,x_0+h*dx(t_0,x_0) ) )
 32 //
 33 // Second order solver.
 34 // Takes the current derivative and add it to the current position.
 35 // Takes the output and its derivative. Adds the mean of both
 36 // derivatives to form the final output.
 37 
 38 // Author: W. Wander <wwc@mit.edu>, 12.09.1997
 39 // -------------------------------------------------------------------
 40 #ifndef G4IMPLICITEULER_HH
 41 #define G4IMPLICITEULER_HH
 42 
 43 #include "G4MagErrorStepper.hh"
 44 
 45 class G4ImplicitEuler : public G4MagErrorStepper
 46 {
 47   public:
 48 
 49     G4ImplicitEuler(G4EquationOfMotion* EqRhs, G4int numberOfVariables = 6);
 50    ~G4ImplicitEuler() override;
 51 
 52     void  DumbStepper( const G4double y[] ,
 53                        const G4double dydx[] ,
 54                              G4double h ,
 55                              G4double yout[] ) override;
 56 
 57     inline G4int IntegratorOrder() const override { return 2; }
 58 
 59   private:
 60 
 61     G4double* dydxTemp = nullptr;
 62     G4double* yTemp = nullptr;    
 63       // Temporaries, created to avoid new/delete on every call
 64 };
 65 
 66 #endif
 67