Import Geant4 0.0.0 source tree

2016-06-01 15:25:35 +02:00
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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: G4SimpleHeum.cc,v 2.6 1998/11/17 18:20:11 japost Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+//  Simple Heum:
+//        x_1 = x_0 + h *
+//                1/4 * dx(t0,x0)  +
+//                3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0)))) 
+//
+// third order solver
+//
+//  W.Wander <wwc@mit.edu> 12/09/97 
+//  6.11.98. V.Grichine new data member fNumberOfVariables
+
+
+#include "G4SimpleHeum.hh"
+#include "G4ThreeVector.hh"
+
+///////////////////////////////////////////////////////////////////////////
+//
+// Constructor
+
+G4SimpleHeum::G4SimpleHeum(G4Mag_EqRhs *EqRhs, G4int num_variables): 
+  G4MagErrorStepper(EqRhs, num_variables),
+  fNumberOfVariables(num_variables)
+{
+  dydxTemp  = new G4double[fNumberOfVariables] ; 
+  dydxTemp2 = new G4double[fNumberOfVariables] ;
+  yTemp     = new G4double[fNumberOfVariables] ; 
+  yTemp2    = new G4double[fNumberOfVariables] ;
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+//
+// Destructor
+
+G4SimpleHeum::~G4SimpleHeum()
+{
+  delete dydxTemp;
+  delete dydxTemp2;
+  delete yTemp;
+  delete yTemp2;
+}
+
+
+//////////////////////////////////////////////////////////////////////
+//
+//
+
+void
+G4SimpleHeum::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] + (1.0/3.0) * h *  dydx[i] ;
+  }
+  
+  RightHandSide(yTemp,dydxTemp);
+
+  for( i = 0; i < fNumberOfVariables; i++ ) 
+  {
+    yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxTemp[i] ;
+  }
+
+  RightHandSide(yTemp2,dydxTemp2);
+
+  for( i = 0; i < fNumberOfVariables; i++ ) 
+  {
+    yOut[i] = yIn[i] + h * ( 0.25 * dydx[i] +
+			     0.75 * dydxTemp2[i]);
+  }
+      
+  // NormaliseTangentVector( yOut );           
+  
+  return ;
+}