Geant4 Cross Reference

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Geant4/geometry/magneticfield/src/G4SimpleHeum.cc

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  1 //
  2 // ********************************************************************
  3 // * License and Disclaimer                                           *
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 17 // *                                                                  *
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 25 //
 26 // G4SimpleHeum implementation
 27 //
 28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997 
 29 // -------------------------------------------------------------------
 30 
 31 #include "G4SimpleHeum.hh"
 32 #include "G4ThreeVector.hh"
 33 
 34 ///////////////////////////////////////////////////////////////////////////
 35 //
 36 // Constructor
 37 //
 38 G4SimpleHeum::G4SimpleHeum(G4EquationOfMotion* EqRhs, G4int num_variables)
 39   : G4MagErrorStepper(EqRhs, num_variables),
 40     fNumberOfVariables(num_variables)
 41 {
 42   dydxTemp  = new G4double[fNumberOfVariables] ; 
 43   dydxTemp2 = new G4double[fNumberOfVariables] ;
 44   yTemp     = new G4double[fNumberOfVariables] ; 
 45   yTemp2    = new G4double[fNumberOfVariables] ;
 46 }
 47 
 48 //////////////////////////////////////////////////////////////////////////
 49 //
 50 // Destructor
 51 //
 52 G4SimpleHeum::~G4SimpleHeum()
 53 {
 54   delete [] dydxTemp;
 55   delete [] dydxTemp2;
 56   delete [] yTemp;
 57   delete [] yTemp2;
 58 }
 59 
 60 //////////////////////////////////////////////////////////////////////
 61 //
 62 // DumbStepper
 63 //
 64 void
 65 G4SimpleHeum::DumbStepper( const G4double yIn[],
 66                            const G4double dydx[],
 67                                  G4double h,
 68                                  G4double yOut[] )
 69 {
 70   for( G4int i = 0; i < fNumberOfVariables; ++i ) 
 71   {
 72     yTemp[i] = yIn[i] + (1.0/3.0) * h *  dydx[i] ;
 73   }
 74   
 75   RightHandSide(yTemp,dydxTemp);
 76 
 77   for( G4int i = 0; i < fNumberOfVariables; ++i ) 
 78   {
 79     yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxTemp[i] ;
 80   }
 81 
 82   RightHandSide(yTemp2,dydxTemp2);
 83 
 84   for( G4int i = 0; i < fNumberOfVariables; ++i ) 
 85   {
 86     yOut[i] = yIn[i] + h * (0.25 * dydx[i] + 0.75 * dydxTemp2[i]);
 87   }
 88       
 89   if ( fNumberOfVariables == 12 ) { NormalisePolarizationVector( yOut ); }
 90 }  
 91