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25 // 25 //
26 // G4ExplicitEuler implementation <<
27 // 26 //
28 // Explicit Euler: x_1 = x_0 + h * dx_0 << 27 // $Id: G4ExplicitEuler.cc 69786 2013-05-15 09:38:51Z gcosmo $
29 // 28 //
30 // Most simple approach for solving linear dif <<
31 // Take the current derivative and add it to t <<
32 // 29 //
33 // Created: W.Wander <wwc@mit.edu>, 12.09.1997 << 30 // Explicit Euler: x_1 = x_0 + h * dx_0
>> 31 //
>> 32 // most simple approach for solving linear differential equations.
>> 33 // Take the current derivative and add it to the current position.
>> 34 //
>> 35 // W.Wander <wwc@mit.edu> 12/09/97
34 // ------------------------------------------- 36 // -------------------------------------------------------------------
35 37
36 #include "G4ExplicitEuler.hh" 38 #include "G4ExplicitEuler.hh"
37 #include "G4ThreeVector.hh" 39 #include "G4ThreeVector.hh"
38 40
39 ////////////////////////////////////////////// 41 //////////////////////////////////////////////////////////////////////////
40 // 42 //
41 // Constructor 43 // Constructor
42 // << 44
43 G4ExplicitEuler::G4ExplicitEuler(G4EquationOfM 45 G4ExplicitEuler::G4ExplicitEuler(G4EquationOfMotion* EqRhs,
44 G4int numberO 46 G4int numberOfVariables)
45 : G4MagErrorStepper(EqRhs, numberOfVariables) 47 : G4MagErrorStepper(EqRhs, numberOfVariables)
46 { 48 {
47 } 49 }
48 50
49 51
50 ////////////////////////////////////////////// 52 ///////////////////////////////////////////////////////////////////////
51 // 53 //
52 // Destructor 54 // Destructor
53 // << 55
54 G4ExplicitEuler::~G4ExplicitEuler() = default; << 56 G4ExplicitEuler::~G4ExplicitEuler()
>> 57 {
>> 58 }
55 59
56 60
57 ////////////////////////////////////////////// 61 ///////////////////////////////////////////////////////////////////////
58 // 62 //
59 // 63 //
60 // << 64
61 void 65 void
62 G4ExplicitEuler::DumbStepper( const G4double y << 66 G4ExplicitEuler::DumbStepper( const G4double yIn[],
63 const G4double dydx[], << 67 const G4double dydx[],
64 G4double h, << 68 G4double h,
65 G4double yOut[] ) << 69 G4double yOut[] )
66 { 70 {
67 const G4int numberOfVariables = GetNumberOfV << 71 const G4int numberOfVariables= GetNumberOfVariables();
68 72
69 // Initialise time to t0, needed when it is 73 // Initialise time to t0, needed when it is not updated by the integration.
>> 74 // yOut[7] = yIn[7]; // Better to set it to NaN; // TODO
>> 75
>> 76 G4int i;
70 77
71 for(G4int i=0; i< numberOfVariables; ++i) << 78 for(i=0;i< numberOfVariables;i++)
72 { 79 {
73 yOut[i] = yIn[i] + h*dydx[i] ; 80 yOut[i] = yIn[i] + h*dydx[i] ; // 1st and only Step
74 } 81 }
75 82
76 return; << 83 return ;
77 } 84 }
78 85