Geant4 Cross Reference

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Geant4/geometry/magneticfield/include/G4RK547FEq3.hh

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 24 //
 25 // G4RK547FEq3
 26 //
 27 // Class description:
 28 //
 29 // An implementation of the 7 stage embedded Runge-Kutta 4,5 pair (RK547FEq3)
 30 // from the paper:
 31 //    D. J. Higham and G. Hall,
 32 //    "Embedded Runge-Kutta formulae with stable equilibrium states",
 33 //    J. Comput. Appl. Math., vol. 29, no. 1, pp. 25-33, 1990.
 34 
 35 // Author: Dmitry Sorokin, Google Summer of Code 2017
 36 // Supervision: John Apostolakis, CERN
 37 // --------------------------------------------------------------------
 38 #ifndef G4RK547FEq3_HH
 39 #define G4RK547FEq3_HH
 40 
 41 #include "G4MagIntegratorStepper.hh"
 42 #include "G4FieldTrack.hh"
 43 
 44 class G4RK547FEq3 : public G4MagIntegratorStepper
 45 {
 46   public:
 47 
 48     G4RK547FEq3(G4EquationOfMotion* EqRhs, G4int integrationVariables = 6);
 49 
 50     G4RK547FEq3(const G4RK547FEq3&) = delete;
 51     G4RK547FEq3& operator = (const G4RK547FEq3&) = delete;
 52 
 53     void Stepper( const G4double yInput[],
 54                   const G4double dydx[],
 55                         G4double hstep,
 56                         G4double yOutput[],
 57                         G4double yError[] ) override;
 58 
 59     void Stepper( const G4double yInput[],
 60                   const G4double dydx[],
 61                         G4double hstep,
 62                         G4double yOutput[],
 63                         G4double yError[],
 64                         G4double dydxOutput[] );
 65 
 66     G4double DistChord() const override;
 67     G4int IntegratorOrder() const override { return 4; }
 68 
 69   private:
 70 
 71     void makeStep( const G4double yInput[],
 72                    const G4double dydx[],
 73                    const G4double hstep,
 74                          G4double yOutput[],
 75                          G4double* dydxOutput = nullptr,
 76                          G4double* yError = nullptr) const;
 77   private:
 78 
 79     G4double fyIn[G4FieldTrack::ncompSVEC],
 80              fdydx[G4FieldTrack::ncompSVEC],
 81              fyOut[G4FieldTrack::ncompSVEC],
 82              fdydxOut[G4FieldTrack::ncompSVEC];
 83 
 84     G4double fhstep = -1.0;
 85 };
 86 
 87 #endif
 88