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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4SimpleHeum implementation <<
27 // 26 //
28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997 << 27 //
>> 28 // Simple Heum:
>> 29 // x_1 = x_0 + h *
>> 30 // 1/4 * dx(t0,x0) +
>> 31 // 3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0))))
>> 32 //
>> 33 // Third order solver.
>> 34 //
>> 35 // W.Wander <wwc@mit.edu> 12/09/97
29 // ------------------------------------------- 36 // -------------------------------------------------------------------
30 37
31 #include "G4SimpleHeum.hh" 38 #include "G4SimpleHeum.hh"
32 #include "G4ThreeVector.hh" 39 #include "G4ThreeVector.hh"
33 40
34 ////////////////////////////////////////////// 41 ///////////////////////////////////////////////////////////////////////////
35 // 42 //
36 // Constructor 43 // Constructor
37 // << 44
38 G4SimpleHeum::G4SimpleHeum(G4EquationOfMotion* << 45 G4SimpleHeum::G4SimpleHeum(G4EquationOfMotion *EqRhs, G4int num_variables):
39 : G4MagErrorStepper(EqRhs, num_variables), << 46 G4MagErrorStepper(EqRhs, num_variables),
40 fNumberOfVariables(num_variables) << 47 fNumberOfVariables(num_variables)
41 { 48 {
42 dydxTemp = new G4double[fNumberOfVariables] 49 dydxTemp = new G4double[fNumberOfVariables] ;
43 dydxTemp2 = new G4double[fNumberOfVariables] 50 dydxTemp2 = new G4double[fNumberOfVariables] ;
44 yTemp = new G4double[fNumberOfVariables] 51 yTemp = new G4double[fNumberOfVariables] ;
45 yTemp2 = new G4double[fNumberOfVariables] 52 yTemp2 = new G4double[fNumberOfVariables] ;
46 } 53 }
47 54
>> 55
48 ////////////////////////////////////////////// 56 //////////////////////////////////////////////////////////////////////////
49 // 57 //
50 // Destructor 58 // Destructor
51 // << 59
52 G4SimpleHeum::~G4SimpleHeum() 60 G4SimpleHeum::~G4SimpleHeum()
53 { 61 {
54 delete [] dydxTemp; << 62 delete[] dydxTemp;
55 delete [] dydxTemp2; << 63 delete[] dydxTemp2;
56 delete [] yTemp; << 64 delete[] yTemp;
57 delete [] yTemp2; << 65 delete[] yTemp2;
58 } 66 }
59 67
>> 68
60 ////////////////////////////////////////////// 69 //////////////////////////////////////////////////////////////////////
61 // 70 //
62 // DumbStepper <<
63 // 71 //
>> 72
64 void 73 void
65 G4SimpleHeum::DumbStepper( const G4double yIn[ << 74 G4SimpleHeum::DumbStepper( const G4double yIn[],
66 const G4double dydx << 75 const G4double dydx[],
67 G4double h, << 76 G4double h,
68 G4double yOut << 77 G4double yOut[])
69 { 78 {
70 for( G4int i = 0; i < fNumberOfVariables; ++ << 79 G4int i;
>> 80 for( i = 0; i < fNumberOfVariables; i++ )
71 { 81 {
72 yTemp[i] = yIn[i] + (1.0/3.0) * h * dydx[ 82 yTemp[i] = yIn[i] + (1.0/3.0) * h * dydx[i] ;
73 } 83 }
74 84
75 RightHandSide(yTemp,dydxTemp); 85 RightHandSide(yTemp,dydxTemp);
76 86
77 for( G4int i = 0; i < fNumberOfVariables; ++ << 87 for( i = 0; i < fNumberOfVariables; i++ )
78 { 88 {
79 yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxT 89 yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxTemp[i] ;
80 } 90 }
81 91
82 RightHandSide(yTemp2,dydxTemp2); 92 RightHandSide(yTemp2,dydxTemp2);
83 93
84 for( G4int i = 0; i < fNumberOfVariables; ++ << 94 for( i = 0; i < fNumberOfVariables; i++ )
85 { 95 {
86 yOut[i] = yIn[i] + h * (0.25 * dydx[i] + 0 96 yOut[i] = yIn[i] + h * (0.25 * dydx[i] + 0.75 * dydxTemp2[i]);
87 } 97 }
88 98
89 if ( fNumberOfVariables == 12 ) { NormaliseP 99 if ( fNumberOfVariables == 12 ) { NormalisePolarizationVector( yOut ); }
90 } 100 }
91 101