| Geant4 Cross Reference |
1 // 1 //
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4ExplicitEuler implementation <<
27 // 23 //
28 // Explicit Euler: x_1 = x_0 + h * dx_0 << 24 // $Id: G4ExplicitEuler.cc,v 1.5 2002/11/29 13:50:18 japost Exp $
>> 25 // GEANT4 tag $Name: geant4-05-00 $
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
34 // ------------------------------------------- << 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
35 34
36 #include "G4ExplicitEuler.hh" 35 #include "G4ExplicitEuler.hh"
37 #include "G4ThreeVector.hh" 36 #include "G4ThreeVector.hh"
38 37
39 ////////////////////////////////////////////// 38 //////////////////////////////////////////////////////////////////////////
40 // 39 //
41 // Constructor 40 // Constructor
42 // << 41
43 G4ExplicitEuler::G4ExplicitEuler(G4EquationOfM << 42 G4ExplicitEuler::G4ExplicitEuler(G4Mag_EqRhs *EqRhs,
44 G4int numberO 43 G4int numberOfVariables)
45 : G4MagErrorStepper(EqRhs, numberOfVariables) 44 : G4MagErrorStepper(EqRhs, numberOfVariables)
46 { 45 {
47 } 46 }
48 47
49 48
50 ////////////////////////////////////////////// 49 ///////////////////////////////////////////////////////////////////////
51 // 50 //
52 // Destructor 51 // Destructor
53 // << 52
54 G4ExplicitEuler::~G4ExplicitEuler() = default; << 53 G4ExplicitEuler::~G4ExplicitEuler()
>> 54 {
>> 55 }
55 56
56 57
57 ////////////////////////////////////////////// 58 ///////////////////////////////////////////////////////////////////////
58 // 59 //
59 // 60 //
60 // << 61
61 void 62 void
62 G4ExplicitEuler::DumbStepper( const G4double y << 63 G4ExplicitEuler::DumbStepper( const G4double yIn[],
63 const G4double dydx[], << 64 const G4double dydx[],
64 G4double h, << 65 G4double h,
65 G4double yOut[] ) << 66 G4double yOut[] )
66 { 67 {
67 const G4int numberOfVariables = GetNumberOfV << 68 const G4int numberOfVariables= GetNumberOfVariables();
68 69
69 // Initialise time to t0, needed when it is 70 // Initialise time to t0, needed when it is not updated by the integration.
>> 71 // yOut[7] = yIn[7]; // Better to set it to NaN; // TODO
>> 72
>> 73 G4int i;
70 74
71 for(G4int i=0; i< numberOfVariables; ++i) << 75 for(i=0;i< numberOfVariables;i++)
72 { 76 {
73 yOut[i] = yIn[i] + h*dydx[i] ; 77 yOut[i] = yIn[i] + h*dydx[i] ; // 1st and only Step
74 } 78 }
75 79
76 return; << 80 return ;
77 } 81 }
78 82