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1 // 1 //
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4HelixImplicitEuler << 23 //
>> 24 // $Id: G4HelixImplicitEuler.hh,v 1.7 2003/10/31 14:35:51 gcosmo Exp $
>> 25 // GEANT4 tag $Name: geant4-06-00 $
>> 26 //
>> 27 //
>> 28 // class G4HelixImplicitEuler
27 // 29 //
28 // Class description: 30 // Class description:
29 // 31 //
30 // Helix Implicit Euler stepper for magnetic 32 // Helix Implicit Euler stepper for magnetic field:
31 // x_1 = x_0 + 1/2 * ( helix(h,t_0,x_0) 33 // x_1 = x_0 + 1/2 * ( helix(h,t_0,x_0)
32 // + helix(h,t_0+h,x_ 34 // + helix(h,t_0+h,x_0+helix(h,t0,x0) ) )
33 // Second order solver. 35 // Second order solver.
34 // Take the current derivative and add it to 36 // Take the current derivative and add it to the current position.
35 // Take the output and its derivative. Add th 37 // Take the output and its derivative. Add the mean of both derivatives
36 // to form the final output. 38 // to form the final output.
37 39
38 // Author: W.Wander <wwc@mit.edu>, 03/11/1998 << 40 // History:
>> 41 // - Created. W.Wander <wwc@mit.edu>, 03/11/98
39 // ------------------------------------------- 42 // -------------------------------------------------------------------
>> 43
40 #ifndef G4HELIXIMPLICITEULER_HH 44 #ifndef G4HELIXIMPLICITEULER_HH
41 #define G4HELIXIMPLICITEULER_HH 45 #define G4HELIXIMPLICITEULER_HH
42 46
43 #include "G4MagHelicalStepper.hh" 47 #include "G4MagHelicalStepper.hh"
44 48
45 class G4HelixImplicitEuler : public G4MagHelic 49 class G4HelixImplicitEuler : public G4MagHelicalStepper
46 { 50 {
47 public: <<
48 51
49 G4HelixImplicitEuler(G4Mag_EqRhs *EqRhs); << 52 public: // with description
50 ~G4HelixImplicitEuler() override; << 53
>> 54 G4HelixImplicitEuler(G4Mag_EqRhs *EqRhs)
>> 55 : G4MagHelicalStepper(EqRhs) {}
>> 56
>> 57 ~G4HelixImplicitEuler() {}
51 58
52 void DumbStepper( const G4double y[], 59 void DumbStepper( const G4double y[],
53 G4ThreeVector Bfld << 60 G4ThreeVector Bfld,
54 G4double h, << 61 G4double h,
55 G4double yout << 62 G4double yout[]);
56 63
57 inline G4int IntegratorOrder() const overr << 64 public: // without description
>> 65
>> 66 G4int IntegratorOrder() const { return 2; }
58 }; 67 };
59 68
60 #endif << 69 #endif /* G4HELIXIMPLICITEULER_HH */
61 70