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Geant4/geometry/magneticfield/src/G4ExplicitEuler.cc

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Differences between /geometry/magneticfield/src/G4ExplicitEuler.cc (Version 11.3.0) and /geometry/magneticfield/src/G4ExplicitEuler.cc (Version 9.2.p3)


  1 //                                                  1 //
  2 // *******************************************      2 // ********************************************************************
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 24 // *******************************************     24 // ********************************************************************
 25 //                                                 25 //
 26 // G4ExplicitEuler implementation              << 
 27 //                                                 26 //
 28 // Explicit Euler: x_1 = x_0 + h * dx_0        <<  27 // $Id: G4ExplicitEuler.cc,v 1.8 2006/06/29 18:23:53 gunter Exp $
                                                   >>  28 // GEANT4 tag $Name: geant4-09-02-patch-03 $
 29 //                                                 29 //
 30 // Most simple approach for solving linear dif << 
 31 // Take the current derivative and add it to t << 
 32 //                                                 30 //
 33 // Created: W.Wander <wwc@mit.edu>, 12.09.1997 <<  31 //  Explicit Euler: x_1 = x_0 + h * dx_0
                                                   >>  32 //
                                                   >>  33 //  most simple approach for solving linear differential equations.
                                                   >>  34 //  Take the current derivative and add it to the current position.
                                                   >>  35 //
                                                   >>  36 //  W.Wander <wwc@mit.edu> 12/09/97 
 34 // -------------------------------------------     37 // -------------------------------------------------------------------
 35                                                    38 
 36 #include "G4ExplicitEuler.hh"                      39 #include "G4ExplicitEuler.hh"
 37 #include "G4ThreeVector.hh"                        40 #include "G4ThreeVector.hh"
 38                                                    41 
 39 //////////////////////////////////////////////     42 //////////////////////////////////////////////////////////////////////////
 40 //                                                 43 //
 41 // Constructor                                     44 // Constructor
 42 //                                             <<  45 
 43 G4ExplicitEuler::G4ExplicitEuler(G4EquationOfM     46 G4ExplicitEuler::G4ExplicitEuler(G4EquationOfMotion* EqRhs, 
 44                                  G4int numberO     47                                  G4int numberOfVariables)
 45  : G4MagErrorStepper(EqRhs, numberOfVariables)     48  : G4MagErrorStepper(EqRhs, numberOfVariables)
 46 {                                                  49 {
 47 }                                                  50 }
 48                                                    51 
 49                                                    52 
 50 //////////////////////////////////////////////     53 ///////////////////////////////////////////////////////////////////////
 51 //                                                 54 //
 52 // Destructor                                      55 // Destructor
 53 //                                             <<  56 
 54 G4ExplicitEuler::~G4ExplicitEuler() = default; <<  57 G4ExplicitEuler::~G4ExplicitEuler()
                                                   >>  58 {
                                                   >>  59 }
 55                                                    60 
 56                                                    61 
 57 //////////////////////////////////////////////     62 ///////////////////////////////////////////////////////////////////////
 58 //                                                 63 //
 59 //                                                 64 //
 60 //                                             <<  65 
 61 void                                               66 void
 62 G4ExplicitEuler::DumbStepper( const G4double y <<  67 G4ExplicitEuler::DumbStepper( const G4double  yIn[],
 63             const G4double dydx[],             <<  68             const G4double  dydx[],
 64                   G4double h,                  <<  69                   G4double  h,
 65             G4double yOut[] )                  <<  70             G4double  yOut[]        )
 66 {                                                  71 {
 67   const G4int numberOfVariables = GetNumberOfV <<  72   const G4int numberOfVariables= GetNumberOfVariables();
 68                                                    73 
 69   // Initialise time to t0, needed when it is      74   // Initialise time to t0, needed when it is not updated by the integration.
                                                   >>  75   // yOut[7] = yIn[7];   //  Better to set it to NaN;  // TODO
                                                   >>  76 
                                                   >>  77   G4int i;
 70                                                    78 
 71   for(G4int i=0; i< numberOfVariables; ++i)    <<  79   for(i=0;i< numberOfVariables;i++)
 72   {                                                80   {
 73     yOut[i] = yIn[i] + h*dydx[i] ;                 81     yOut[i] = yIn[i] + h*dydx[i] ;             // 1st and only Step 
 74   }                                                82   }
 75                                                    83   
 76   return;                                      <<  84   return ;
 77 }                                                  85 }  
 78                                                    86