Geant4 Cross Reference

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Geant4/geometry/magneticfield/src/G4ExplicitEuler.cc

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 25 //
 26 // G4ExplicitEuler implementation
 27 //
 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 // Created: W.Wander <wwc@mit.edu>, 12.09.1997
 34 // -------------------------------------------------------------------
 35 
 36 #include "G4ExplicitEuler.hh"
 37 #include "G4ThreeVector.hh"
 38 
 39 //////////////////////////////////////////////////////////////////////////
 40 //
 41 // Constructor
 42 //
 43 G4ExplicitEuler::G4ExplicitEuler(G4EquationOfMotion* EqRhs, 
 44                                  G4int numberOfVariables)
 45  : G4MagErrorStepper(EqRhs, numberOfVariables)
 46 {
 47 }
 48 
 49 
 50 ///////////////////////////////////////////////////////////////////////
 51 //
 52 // Destructor
 53 //
 54 G4ExplicitEuler::~G4ExplicitEuler() = default;
 55 
 56 
 57 ///////////////////////////////////////////////////////////////////////
 58 //
 59 //
 60 //
 61 void
 62 G4ExplicitEuler::DumbStepper( const G4double yIn[],
 63             const G4double dydx[],
 64                   G4double h,
 65             G4double yOut[] )
 66 {
 67   const G4int numberOfVariables = GetNumberOfVariables();
 68 
 69   // Initialise time to t0, needed when it is not updated by the integration.
 70 
 71   for(G4int i=0; i< numberOfVariables; ++i)
 72   {
 73     yOut[i] = yIn[i] + h*dydx[i] ;             // 1st and only Step 
 74   }
 75   
 76   return;
 77 }  
 78