Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/geometry/magneticfield/src/G4SimpleRunge.cc

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  1 //
  2 // ********************************************************************
  3 // * License and Disclaimer                                           *
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  6 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
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 14 // * regarding  this  software system or assume any liability for its *
 15 // * use.  Please see the license in the file  LICENSE  and URL above *
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 17 // *                                                                  *
 18 // * This  code  implementation is the result of  the  scientific and *
 19 // * technical work of the GEANT4 collaboration.                      *
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 24 // ********************************************************************
 25 //
 26 // G4SimpleRunge implementation
 27 //
 28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997
 29 // -------------------------------------------------------------------
 30 
 31 #include "G4SimpleRunge.hh"
 32 #include "G4ThreeVector.hh"
 33 
 34 ////////////////////////////////////////////////////////////////
 35 //
 36 // Constructor
 37 //
 38 G4SimpleRunge::G4SimpleRunge(G4EquationOfMotion* EqRhs, G4int numberOfVariables)
 39   : G4MagErrorStepper(EqRhs, numberOfVariables),
 40     fNumberOfVariables(numberOfVariables)
 41 {
 42    
 43    unsigned int noVariables= std::max(numberOfVariables,
 44                                       GetNumberOfStateVariables()); 
 45                                              // To deal with Time >= 7+1 
 46    dydxTemp = new G4double[noVariables] ;
 47    yTemp    = new G4double[noVariables] ;
 48 }
 49 
 50 /////////////////////////////////////////////////////////////////
 51 //
 52 // Destructor
 53 //
 54 G4SimpleRunge::~G4SimpleRunge()
 55 {
 56    delete [] dydxTemp;
 57    delete [] yTemp;
 58 }
 59 
 60 //////////////////////////////////////////////////////////////////
 61 //
 62 // DumbStepper
 63 //
 64 void
 65 G4SimpleRunge::DumbStepper( const G4double  yIn[],
 66                             const G4double  dydx[],
 67                                   G4double  h,
 68                                    G4double  yOut[] )
 69 {
 70   // Initialise time to t0, needed when it is not updated by the integration.
 71   //
 72   yTemp[7] = yOut[7] = yIn[7];
 73 
 74   for( G4int i = 0; i < fNumberOfVariables; ++i ) 
 75   {
 76     yTemp[i] = yIn[i] + 0.5 * h*dydx[i] ;
 77   }
 78   
 79   RightHandSide(yTemp,dydxTemp);
 80   
 81   for( G4int i = 0; i < fNumberOfVariables; ++i ) 
 82   {
 83     yOut[i] = yIn[i] + h * ( dydxTemp[i] );
 84   }
 85 }  
 86