| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer 3 // * License and Disclaimer *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th 5 // * The Geant4 software is copyright of the Copyright Holders of *
6 // * the Geant4 Collaboration. It is provided 6 // * the Geant4 Collaboration. It is provided under the terms and *
7 // * conditions of the Geant4 Software License 7 // * conditions of the Geant4 Software License, included in the file *
8 // * LICENSE and available at http://cern.ch/ 8 // * LICENSE and available at http://cern.ch/geant4/license . These *
9 // * include a list of copyright holders. 9 // * include a list of copyright holders. *
10 // * 10 // * *
11 // * Neither the authors of this software syst 11 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 12 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 13 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 14 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file 15 // * use. Please see the license in the file LICENSE and URL above *
16 // * for the full disclaimer and the limitatio 16 // * for the full disclaimer and the limitation of liability. *
17 // * 17 // * *
18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its *
22 // * use in resulting scientific publicati 22 // * use in resulting scientific publications, and indicate your *
23 // * acceptance of all terms of the Geant4 Sof 23 // * acceptance of all terms of the Geant4 Software license. *
24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4ExplicitEuler implementation <<
27 // 26 //
28 // Explicit Euler: x_1 = x_0 + h * dx_0 << 27 // $Id: G4ExplicitEuler.cc,v 1.8 2006/06/29 18:23:53 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-08-01 $
29 // 29 //
30 // Most simple approach for solving linear dif <<
31 // Take the current derivative and add it to t <<
32 // 30 //
33 // Created: W.Wander <wwc@mit.edu>, 12.09.1997 << 31 // Explicit Euler: x_1 = x_0 + h * dx_0
>> 32 //
>> 33 // most simple approach for solving linear differential equations.
>> 34 // Take the current derivative and add it to the current position.
>> 35 //
>> 36 // W.Wander <wwc@mit.edu> 12/09/97
34 // ------------------------------------------- 37 // -------------------------------------------------------------------
35 38
36 #include "G4ExplicitEuler.hh" 39 #include "G4ExplicitEuler.hh"
37 #include "G4ThreeVector.hh" 40 #include "G4ThreeVector.hh"
38 41
39 ////////////////////////////////////////////// 42 //////////////////////////////////////////////////////////////////////////
40 // 43 //
41 // Constructor 44 // Constructor
42 // << 45
43 G4ExplicitEuler::G4ExplicitEuler(G4EquationOfM 46 G4ExplicitEuler::G4ExplicitEuler(G4EquationOfMotion* EqRhs,
44 G4int numberO 47 G4int numberOfVariables)
45 : G4MagErrorStepper(EqRhs, numberOfVariables) 48 : G4MagErrorStepper(EqRhs, numberOfVariables)
46 { 49 {
47 } 50 }
48 51
49 52
50 ////////////////////////////////////////////// 53 ///////////////////////////////////////////////////////////////////////
51 // 54 //
52 // Destructor 55 // Destructor
53 // << 56
54 G4ExplicitEuler::~G4ExplicitEuler() = default; << 57 G4ExplicitEuler::~G4ExplicitEuler()
>> 58 {
>> 59 }
55 60
56 61
57 ////////////////////////////////////////////// 62 ///////////////////////////////////////////////////////////////////////
58 // 63 //
59 // 64 //
60 // << 65
61 void 66 void
62 G4ExplicitEuler::DumbStepper( const G4double y << 67 G4ExplicitEuler::DumbStepper( const G4double yIn[],
63 const G4double dydx[], << 68 const G4double dydx[],
64 G4double h, << 69 G4double h,
65 G4double yOut[] ) << 70 G4double yOut[] )
66 { 71 {
67 const G4int numberOfVariables = GetNumberOfV << 72 const G4int numberOfVariables= GetNumberOfVariables();
68 73
69 // Initialise time to t0, needed when it is 74 // Initialise time to t0, needed when it is not updated by the integration.
>> 75 // yOut[7] = yIn[7]; // Better to set it to NaN; // TODO
>> 76
>> 77 G4int i;
70 78
71 for(G4int i=0; i< numberOfVariables; ++i) << 79 for(i=0;i< numberOfVariables;i++)
72 { 80 {
73 yOut[i] = yIn[i] + h*dydx[i] ; 81 yOut[i] = yIn[i] + h*dydx[i] ; // 1st and only Step
74 } 82 }
75 83
76 return; << 84 return ;
77 } 85 }
78 86