G4ExplicitEuler.cc

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00027 // $Id: G4ExplicitEuler.cc 69786 2013-05-15 09:38:51Z gcosmo $
00028 //
00029 //
00030 //  Explicit Euler: x_1 = x_0 + h * dx_0
00031 //
00032 //  most simple approach for solving linear differential equations.
00033 //  Take the current derivative and add it to the current position.
00034 //
00035 //  W.Wander <wwc@mit.edu> 12/09/97 
00036 // -------------------------------------------------------------------
00037 
00038 #include "G4ExplicitEuler.hh"
00039 #include "G4ThreeVector.hh"
00040 
00042 //
00043 // Constructor
00044 
00045 G4ExplicitEuler::G4ExplicitEuler(G4EquationOfMotion* EqRhs, 
00046                                  G4int numberOfVariables)
00047  : G4MagErrorStepper(EqRhs, numberOfVariables)
00048 {
00049 }
00050 
00051 
00053 //
00054 // Destructor
00055 
00056 G4ExplicitEuler::~G4ExplicitEuler()
00057 {
00058 }
00059 
00060 
00062 //
00063 //
00064 
00065 void
00066 G4ExplicitEuler::DumbStepper( const G4double  yIn[],
00067                               const G4double  dydx[],
00068                                     G4double  h,
00069                                     G4double  yOut[]        )
00070 {
00071   const G4int numberOfVariables= GetNumberOfVariables();
00072 
00073   // Initialise time to t0, needed when it is not updated by the integration.
00074   // yOut[7] = yIn[7];   //  Better to set it to NaN;  // TODO
00075 
00076   G4int i;
00077 
00078   for(i=0;i< numberOfVariables;i++)
00079   {
00080     yOut[i] = yIn[i] + h*dydx[i] ;             // 1st and only Step 
00081   }
00082   
00083   return ;
00084 }  

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