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1 // 1 //
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18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4SimpleHeum implementation 26 // G4SimpleHeum implementation
27 // 27 //
28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997 28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997
29 // ------------------------------------------- 29 // -------------------------------------------------------------------
30 30
31 #include "G4SimpleHeum.hh" 31 #include "G4SimpleHeum.hh"
32 #include "G4ThreeVector.hh" 32 #include "G4ThreeVector.hh"
33 33
34 ////////////////////////////////////////////// 34 ///////////////////////////////////////////////////////////////////////////
35 // 35 //
36 // Constructor 36 // Constructor
37 // 37 //
38 G4SimpleHeum::G4SimpleHeum(G4EquationOfMotion* 38 G4SimpleHeum::G4SimpleHeum(G4EquationOfMotion* EqRhs, G4int num_variables)
39 : G4MagErrorStepper(EqRhs, num_variables), 39 : G4MagErrorStepper(EqRhs, num_variables),
40 fNumberOfVariables(num_variables) 40 fNumberOfVariables(num_variables)
41 { 41 {
42 dydxTemp = new G4double[fNumberOfVariables] 42 dydxTemp = new G4double[fNumberOfVariables] ;
43 dydxTemp2 = new G4double[fNumberOfVariables] 43 dydxTemp2 = new G4double[fNumberOfVariables] ;
44 yTemp = new G4double[fNumberOfVariables] 44 yTemp = new G4double[fNumberOfVariables] ;
45 yTemp2 = new G4double[fNumberOfVariables] 45 yTemp2 = new G4double[fNumberOfVariables] ;
46 } 46 }
47 47
48 ////////////////////////////////////////////// 48 //////////////////////////////////////////////////////////////////////////
49 // 49 //
50 // Destructor 50 // Destructor
51 // 51 //
52 G4SimpleHeum::~G4SimpleHeum() 52 G4SimpleHeum::~G4SimpleHeum()
53 { 53 {
54 delete [] dydxTemp; 54 delete [] dydxTemp;
55 delete [] dydxTemp2; 55 delete [] dydxTemp2;
56 delete [] yTemp; 56 delete [] yTemp;
57 delete [] yTemp2; 57 delete [] yTemp2;
58 } 58 }
59 59
60 ////////////////////////////////////////////// 60 //////////////////////////////////////////////////////////////////////
61 // 61 //
62 // DumbStepper 62 // DumbStepper
63 // 63 //
64 void 64 void
65 G4SimpleHeum::DumbStepper( const G4double yIn[ 65 G4SimpleHeum::DumbStepper( const G4double yIn[],
66 const G4double dydx 66 const G4double dydx[],
67 G4double h, 67 G4double h,
68 G4double yOut 68 G4double yOut[] )
69 { 69 {
70 for( G4int i = 0; i < fNumberOfVariables; ++ 70 for( G4int i = 0; i < fNumberOfVariables; ++i )
71 { 71 {
72 yTemp[i] = yIn[i] + (1.0/3.0) * h * dydx[ 72 yTemp[i] = yIn[i] + (1.0/3.0) * h * dydx[i] ;
73 } 73 }
74 74
75 RightHandSide(yTemp,dydxTemp); 75 RightHandSide(yTemp,dydxTemp);
76 76
77 for( G4int i = 0; i < fNumberOfVariables; ++ 77 for( G4int i = 0; i < fNumberOfVariables; ++i )
78 { 78 {
79 yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxT 79 yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxTemp[i] ;
80 } 80 }
81 81
82 RightHandSide(yTemp2,dydxTemp2); 82 RightHandSide(yTemp2,dydxTemp2);
83 83
84 for( G4int i = 0; i < fNumberOfVariables; ++ 84 for( G4int i = 0; i < fNumberOfVariables; ++i )
85 { 85 {
86 yOut[i] = yIn[i] + h * (0.25 * dydx[i] + 0 86 yOut[i] = yIn[i] + h * (0.25 * dydx[i] + 0.75 * dydxTemp2[i]);
87 } 87 }
88 88
89 if ( fNumberOfVariables == 12 ) { NormaliseP 89 if ( fNumberOfVariables == 12 ) { NormalisePolarizationVector( yOut ); }
90 } 90 }
91 91