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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4SimpleHeum implementation <<
27 // 26 //
28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997 << 27 // $Id: G4SimpleHeum.cc 66356 2012-12-18 09:02:32Z gcosmo $
>> 28 //
>> 29 // Simple Heum:
>> 30 // x_1 = x_0 + h *
>> 31 // 1/4 * dx(t0,x0) +
>> 32 // 3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0))))
>> 33 //
>> 34 // Third order solver.
>> 35 //
>> 36 // W.Wander <wwc@mit.edu> 12/09/97
29 // ------------------------------------------- 37 // -------------------------------------------------------------------
30 38
31 #include "G4SimpleHeum.hh" 39 #include "G4SimpleHeum.hh"
32 #include "G4ThreeVector.hh" 40 #include "G4ThreeVector.hh"
33 41
34 ////////////////////////////////////////////// 42 ///////////////////////////////////////////////////////////////////////////
35 // 43 //
36 // Constructor 44 // Constructor
37 // << 45
38 G4SimpleHeum::G4SimpleHeum(G4EquationOfMotion* << 46 G4SimpleHeum::G4SimpleHeum(G4EquationOfMotion *EqRhs, G4int num_variables):
39 : G4MagErrorStepper(EqRhs, num_variables), << 47 G4MagErrorStepper(EqRhs, num_variables),
40 fNumberOfVariables(num_variables) << 48 fNumberOfVariables(num_variables)
41 { 49 {
42 dydxTemp = new G4double[fNumberOfVariables] 50 dydxTemp = new G4double[fNumberOfVariables] ;
43 dydxTemp2 = new G4double[fNumberOfVariables] 51 dydxTemp2 = new G4double[fNumberOfVariables] ;
44 yTemp = new G4double[fNumberOfVariables] 52 yTemp = new G4double[fNumberOfVariables] ;
45 yTemp2 = new G4double[fNumberOfVariables] 53 yTemp2 = new G4double[fNumberOfVariables] ;
46 } 54 }
47 55
>> 56
48 ////////////////////////////////////////////// 57 //////////////////////////////////////////////////////////////////////////
49 // 58 //
50 // Destructor 59 // Destructor
51 // << 60
52 G4SimpleHeum::~G4SimpleHeum() 61 G4SimpleHeum::~G4SimpleHeum()
53 { 62 {
54 delete [] dydxTemp; << 63 delete[] dydxTemp;
55 delete [] dydxTemp2; << 64 delete[] dydxTemp2;
56 delete [] yTemp; << 65 delete[] yTemp;
57 delete [] yTemp2; << 66 delete[] yTemp2;
58 } 67 }
59 68
>> 69
60 ////////////////////////////////////////////// 70 //////////////////////////////////////////////////////////////////////
61 // 71 //
62 // DumbStepper <<
63 // 72 //
>> 73
64 void 74 void
65 G4SimpleHeum::DumbStepper( const G4double yIn[ << 75 G4SimpleHeum::DumbStepper( const G4double yIn[],
66 const G4double dydx << 76 const G4double dydx[],
67 G4double h, << 77 G4double h,
68 G4double yOut << 78 G4double yOut[])
69 { 79 {
70 for( G4int i = 0; i < fNumberOfVariables; ++ << 80 G4int i;
>> 81 for( i = 0; i < fNumberOfVariables; i++ )
71 { 82 {
72 yTemp[i] = yIn[i] + (1.0/3.0) * h * dydx[ 83 yTemp[i] = yIn[i] + (1.0/3.0) * h * dydx[i] ;
73 } 84 }
74 85
75 RightHandSide(yTemp,dydxTemp); 86 RightHandSide(yTemp,dydxTemp);
76 87
77 for( G4int i = 0; i < fNumberOfVariables; ++ << 88 for( i = 0; i < fNumberOfVariables; i++ )
78 { 89 {
79 yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxT 90 yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxTemp[i] ;
80 } 91 }
81 92
82 RightHandSide(yTemp2,dydxTemp2); 93 RightHandSide(yTemp2,dydxTemp2);
83 94
84 for( G4int i = 0; i < fNumberOfVariables; ++ << 95 for( i = 0; i < fNumberOfVariables; i++ )
85 { 96 {
86 yOut[i] = yIn[i] + h * (0.25 * dydx[i] + 0 97 yOut[i] = yIn[i] + h * (0.25 * dydx[i] + 0.75 * dydxTemp2[i]);
87 } 98 }
88 99
89 if ( fNumberOfVariables == 12 ) { NormaliseP 100 if ( fNumberOfVariables == 12 ) { NormalisePolarizationVector( yOut ); }
90 } 101 }
91 102