Import Geant4 0.0.0 source tree

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+// This code implementation is the intellectual property of
+// the RD44 GEANT4 collaboration.
+//
+// By copying, distributing or modifying the Program (or any work
+// based on the Program) you indicate your acceptance of this statement,
+// and all its terms.
+//
+// $Id: G4ExplicitEuler.cc,v 2.6 1998/11/12 16:16:10 japost Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+//
+//  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.
+//
+//  W.Wander <wwc@mit.edu> 12/09/97 
+
+#include "G4ExplicitEuler.hh"
+#include "G4ThreeVector.hh"
+
+//////////////////////////////////////////////////////////////////////////
+//
+// Constructor
+
+G4ExplicitEuler::G4ExplicitEuler(G4Mag_EqRhs *EqRhs, 
+                                 G4int numberOfVariables) : 
+                 G4MagErrorStepper(EqRhs, numberOfVariables),
+  fNumberOfVariables(numberOfVariables)
+{
+}
+
+
+///////////////////////////////////////////////////////////////////////
+//
+// Destructor
+
+G4ExplicitEuler::~G4ExplicitEuler()
+{
+   ;
+}
+
+
+///////////////////////////////////////////////////////////////////////
+//
+//
+
+void
+G4ExplicitEuler::DumbStepper( const G4double  yIn[],
+			      const G4double  dydx[],
+			      const G4double  h,
+			 	    G4double  yOut[]        )
+{
+  //  const G4int nvar = 6 ; 
+
+  G4int i;
+
+  for(i=0;i<fNumberOfVariables;i++)
+  {
+    yOut[i] = yIn[i] + h*dydx[i] ;             // 1st and only Step 
+  }
+  // NormaliseTangentVector( yOut );           // this could harm more than
+                                               // it helps - FIXME ???
+  
+  return ;
+
+}