Geant4  10.02.p02
G4ImplicitEuler.hh
Go to the documentation of this file.
1 //
2 // ********************************************************************
3 // * License and Disclaimer *
4 // * *
5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. *
10 // * *
11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitation of liability. *
17 // * *
18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Software license. *
24 // ********************************************************************
25 //
26 //
27 // $Id: G4ImplicitEuler.hh 66356 2012-12-18 09:02:32Z gcosmo $
28 //
29 //
30 // class G4ImplicitEuler
31 //
32 // Class description:
33 //
34 // Implicit Euler stepper for magnetic field:
35 // x_1 = x_0 + h/2 * ( dx(t_0,x_0) + dx(t_0+h,x_0+h*dx(t_0,x_0) ) )
36 //
37 // Second order solver.
38 // Takes the current derivative and add it to the current position.
39 // Takes the output and its derivative. Adds the mean of both
40 // derivatives to form the final output.
41 
42 // W. Wander <wwc@mit.edu> 12/09/97
43 // -------------------------------------------------------------------
44 
45 #ifndef G4IMPLICITEULER_HH
46 #define G4IMPLICITEULER_HH
47 
48 #include "G4MagErrorStepper.hh"
49 
51 {
52 
53  public: // with description
54 
55  G4ImplicitEuler(G4EquationOfMotion *EqRhs, G4int numberOfVariables = 6) ;
57 
58  void DumbStepper( const G4double y[] ,
59  const G4double dydx[] ,
60  G4double h ,
61  G4double yout[] ) ;
62 
63  public: // without description
64 
65  G4int IntegratorOrder() const { return 2 ; } ;
66 
67  private:
68 
71  // Temporaries, created to avoid new/delete on every call
72 };
73 
74 #endif /* G4IMPLICITEULER_HH */
G4int IntegratorOrder() const
int G4int
Definition: G4Types.hh:78
void DumbStepper(const G4double y[], const G4double dydx[], G4double h, G4double yout[])
double G4double
Definition: G4Types.hh:76
G4double * dydxTemp
G4ImplicitEuler(G4EquationOfMotion *EqRhs, G4int numberOfVariables=6)