| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer << 3 // * DISCLAIMER *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th << 5 // * The following disclaimer summarizes all the specific disclaimers *
6 // * the Geant4 Collaboration. It is provided << 6 // * of contributors to this software. The specific disclaimers,which *
7 // * conditions of the Geant4 Software License << 7 // * govern, are listed with their locations in: *
8 // * LICENSE and available at http://cern.ch/ << 8 // * http://cern.ch/geant4/license *
9 // * include a list of copyright holders. <<
10 // * 9 // * *
11 // * Neither the authors of this software syst 10 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 11 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 12 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 13 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file << 14 // * use. *
16 // * for the full disclaimer and the limitatio <<
17 // * 15 // * *
18 // * This code implementation is the result << 16 // * This code implementation is the intellectual property of the *
19 // * technical work of the GEANT4 collaboratio << 17 // * GEANT4 collaboration. *
20 // * By using, copying, modifying or distri << 18 // * By copying, distributing or modifying the Program (or any work *
21 // * any work based on the software) you ag << 19 // * based on the Program) you indicate your acceptance of this *
22 // * use in resulting scientific publicati << 20 // * statement, and all its terms. *
23 // * acceptance of all terms of the Geant4 Sof <<
24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4ExplicitEuler implementation <<
27 // 23 //
28 // Explicit Euler: x_1 = x_0 + h * dx_0 << 24 // $Id: G4ExplicitEuler.cc,v 1.7 2003/11/05 16:31:49 japost Exp $
>> 25 // GEANT4 tag $Name: geant4-06-00-patch-01 $
29 // 26 //
30 // Most simple approach for solving linear dif <<
31 // Take the current derivative and add it to t <<
32 // 27 //
33 // Created: W.Wander <wwc@mit.edu>, 12.09.1997 << 28 // Explicit Euler: x_1 = x_0 + h * dx_0
>> 29 //
>> 30 // most simple approach for solving linear differential equations.
>> 31 // Take the current derivative and add it to the current position.
>> 32 //
>> 33 // W.Wander <wwc@mit.edu> 12/09/97
34 // ------------------------------------------- 34 // -------------------------------------------------------------------
35 35
36 #include "G4ExplicitEuler.hh" 36 #include "G4ExplicitEuler.hh"
37 #include "G4ThreeVector.hh" 37 #include "G4ThreeVector.hh"
38 38
39 ////////////////////////////////////////////// 39 //////////////////////////////////////////////////////////////////////////
40 // 40 //
41 // Constructor 41 // Constructor
42 // << 42
43 G4ExplicitEuler::G4ExplicitEuler(G4EquationOfM 43 G4ExplicitEuler::G4ExplicitEuler(G4EquationOfMotion* EqRhs,
44 G4int numberO 44 G4int numberOfVariables)
45 : G4MagErrorStepper(EqRhs, numberOfVariables) 45 : G4MagErrorStepper(EqRhs, numberOfVariables)
46 { 46 {
47 } 47 }
48 48
49 49
50 ////////////////////////////////////////////// 50 ///////////////////////////////////////////////////////////////////////
51 // 51 //
52 // Destructor 52 // Destructor
53 // << 53
54 G4ExplicitEuler::~G4ExplicitEuler() = default; << 54 G4ExplicitEuler::~G4ExplicitEuler()
>> 55 {
>> 56 }
55 57
56 58
57 ////////////////////////////////////////////// 59 ///////////////////////////////////////////////////////////////////////
58 // 60 //
59 // 61 //
60 // << 62
61 void 63 void
62 G4ExplicitEuler::DumbStepper( const G4double y << 64 G4ExplicitEuler::DumbStepper( const G4double yIn[],
63 const G4double dydx[], << 65 const G4double dydx[],
64 G4double h, << 66 G4double h,
65 G4double yOut[] ) << 67 G4double yOut[] )
66 { 68 {
67 const G4int numberOfVariables = GetNumberOfV << 69 const G4int numberOfVariables= GetNumberOfVariables();
68 70
69 // Initialise time to t0, needed when it is 71 // Initialise time to t0, needed when it is not updated by the integration.
>> 72 // yOut[7] = yIn[7]; // Better to set it to NaN; // TODO
>> 73
>> 74 G4int i;
70 75
71 for(G4int i=0; i< numberOfVariables; ++i) << 76 for(i=0;i< numberOfVariables;i++)
72 { 77 {
73 yOut[i] = yIn[i] + h*dydx[i] ; 78 yOut[i] = yIn[i] + h*dydx[i] ; // 1st and only Step
74 } 79 }
75 80
76 return; << 81 return ;
77 } 82 }
78 83