G4ExplicitEuler.cc

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//
// G4ExplicitEuler implementation
//
// Explicit Euler: x_1 = x_0 + h * dx_0
//
// Most simple approach for solving linear differential equations.
// Take the current derivative and add it to the current position.
//
// Created: W.Wander <[email protected]>, 12.09.1997
// -------------------------------------------------------------------
 
#include "G4ExplicitEuler.hh"
#include "G4ThreeVector.hh"
 
//////////////////////////////////////////////////////////////////////////
//
// Constructor
//
G4ExplicitEuler::G4ExplicitEuler(G4EquationOfMotion* EqRhs, 
                                 G4int numberOfVariables)
 : G4MagErrorStepper(EqRhs, numberOfVariables)
{
}
 
 
///////////////////////////////////////////////////////////////////////
//
// Destructor
//
G4ExplicitEuler::~G4ExplicitEuler()
{
}
 
 
///////////////////////////////////////////////////////////////////////
//
//
//
void
G4ExplicitEuler::DumbStepper( const G4double yIn[],
                  const G4double dydx[],
                        G4double h,
                    G4double yOut[] )
{
  const G4int numberOfVariables = GetNumberOfVariables();
 
  // Initialise time to t0, needed when it is not updated by the integration.
 
  for(G4int i=0; i< numberOfVariables; ++i)
  {
    yOut[i] = yIn[i] + h*dydx[i] ;             // 1st and only Step 
  }
  
  return;
}