G4ExplicitEuler.cc

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
// 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 <wwc@mit.edu>, 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;
}