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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4ExplicitEuler implementation 26 // G4ExplicitEuler implementation
27 // 27 //
28 // Explicit Euler: x_1 = x_0 + h * dx_0 28 // Explicit Euler: x_1 = x_0 + h * dx_0
29 // 29 //
30 // Most simple approach for solving linear dif 30 // Most simple approach for solving linear differential equations.
31 // Take the current derivative and add it to t 31 // Take the current derivative and add it to the current position.
32 // 32 //
33 // Created: W.Wander <wwc@mit.edu>, 12.09.1997 33 // Created: W.Wander <wwc@mit.edu>, 12.09.1997
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.
70 72
71 for(G4int i=0; i< numberOfVariables; ++i) 73 for(G4int i=0; i< numberOfVariables; ++i)
72 { 74 {
73 yOut[i] = yIn[i] + h*dydx[i] ; 75 yOut[i] = yIn[i] + h*dydx[i] ; // 1st and only Step
74 } 76 }
75 77
76 return; 78 return;
77 } 79 }
78 80