| Geant4 Cross Reference |
1 // 1
2 // *******************************************
3 // * License and Disclaimer
4 // *
5 // * The Geant4 software is copyright of th
6 // * the Geant4 Collaboration. It is provided
7 // * conditions of the Geant4 Software License
8 // * LICENSE and available at http://cern.ch/
9 // * include a list of copyright holders.
10 // *
11 // * Neither the authors of this software syst
12 // * institutes,nor the agencies providing fin
13 // * work make any representation or warran
14 // * regarding this software system or assum
15 // * use. Please see the license in the file
16 // * for the full disclaimer and the limitatio
17 // *
18 // * This code implementation is the result
19 // * technical work of the GEANT4 collaboratio
20 // * By using, copying, modifying or distri
21 // * any work based on the software) you ag
22 // * use in resulting scientific publicati
23 // * acceptance of all terms of the Geant4 Sof
24 // *******************************************
25 //
26 // G4SimpleRunge implementation
27 //
28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997
29 // -------------------------------------------
30
31 #include "G4SimpleRunge.hh"
32 #include "G4ThreeVector.hh"
33
34 //////////////////////////////////////////////
35 //
36 // Constructor
37 //
38 G4SimpleRunge::G4SimpleRunge(G4EquationOfMotio
39 : G4MagErrorStepper(EqRhs, numberOfVariables
40 fNumberOfVariables(numberOfVariables)
41 {
42
43 unsigned int noVariables= std::max(numberOf
44 GetNumbe
45 /
46 dydxTemp = new G4double[noVariables] ;
47 yTemp = new G4double[noVariables] ;
48 }
49
50 //////////////////////////////////////////////
51 //
52 // Destructor
53 //
54 G4SimpleRunge::~G4SimpleRunge()
55 {
56 delete [] dydxTemp;
57 delete [] yTemp;
58 }
59
60 //////////////////////////////////////////////
61 //
62 // DumbStepper
63 //
64 void
65 G4SimpleRunge::DumbStepper( const G4double yI
66 const G4double dy
67 G4double h,
68 G4double y
69 {
70 // Initialise time to t0, needed when it is
71 //
72 yTemp[7] = yOut[7] = yIn[7];
73
74 for( G4int i = 0; i < fNumberOfVariables; ++
75 {
76 yTemp[i] = yIn[i] + 0.5 * h*dydx[i] ;
77 }
78
79 RightHandSide(yTemp,dydxTemp);
80
81 for( G4int i = 0; i < fNumberOfVariables; ++
82 {
83 yOut[i] = yIn[i] + h * ( dydxTemp[i] );
84 }
85 }
86