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: G4SimpleRunge.cc,v 2.8 1998/11/19 20:54:58 japost Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+//  Simple Runge:
+//
+//        x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) )
+//
+// second order solver
+// take the derivative at a position to be assumed at the middle of the
+// Step and add it to the current position.
+//
+//
+//  W.Wander <wwc@mit.edu> 12/09/97 
+// 6.11.98 V.Grichine new data member fNumberOfVariables
+//
+
+
+#include "G4SimpleRunge.hh"
+#include "G4ThreeVector.hh"
+
+////////////////////////////////////////////////////////////////
+//
+// Constructor
+
+G4SimpleRunge::G4SimpleRunge(G4Mag_EqRhs *EqRhs, G4int numberOfVariables): 
+G4MagErrorStepper(EqRhs, numberOfVariables),
+  fNumberOfVariables(numberOfVariables)
+{
+   dydxTemp = new G4double[fNumberOfVariables] ;
+   yTemp    = new G4double[fNumberOfVariables] ;
+}
+
+
+/////////////////////////////////////////////////////////////////
+//
+// Destructor
+
+G4SimpleRunge::~G4SimpleRunge()
+{
+   ;
+}
+
+
+//////////////////////////////////////////////////////////////////
+//
+//
+
+void
+G4SimpleRunge::DumbStepper( const G4double  yIn[],
+			    const G4double  dydx[],
+			    const G4double  h,
+			 	  G4double  yOut[])
+{
+  //  const G4int nvar = 6 ;
+  G4int i;
+
+  for( i = 0; i < fNumberOfVariables; i++ ) 
+  {
+    yTemp[i] = yIn[i] + 0.5 * h*dydx[i] ;
+  }
+  
+  RightHandSide(yTemp,dydxTemp);
+  
+  for( i = 0; i < fNumberOfVariables; i++ ) 
+  {
+    yOut[i] = yIn[i] + h * ( dydxTemp[i] );
+  }
+
+  // NormaliseTangentVector( yOut );           
+  
+  return ;
+}