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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,v 1.10 2009-03-25 15:29:02 gcosmo Exp $
>> 28 // GEANT4 tag $Name: not supported by cvs2svn $
>> 29 //
>> 30 // Simple Heum:
>> 31 // x_1 = x_0 + h *
>> 32 // 1/4 * dx(t0,x0) +
>> 33 // 3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0))))
>> 34 //
>> 35 // Third order solver.
>> 36 //
>> 37 // W.Wander <wwc@mit.edu> 12/09/97
29 // ------------------------------------------- 38 // -------------------------------------------------------------------
30 39
31 #include "G4SimpleHeum.hh" 40 #include "G4SimpleHeum.hh"
32 #include "G4ThreeVector.hh" 41 #include "G4ThreeVector.hh"
33 42
34 ////////////////////////////////////////////// 43 ///////////////////////////////////////////////////////////////////////////
35 // 44 //
36 // Constructor 45 // Constructor
37 // << 46
38 G4SimpleHeum::G4SimpleHeum(G4EquationOfMotion* << 47 G4SimpleHeum::G4SimpleHeum(G4EquationOfMotion *EqRhs, G4int num_variables):
39 : G4MagErrorStepper(EqRhs, num_variables), << 48 G4MagErrorStepper(EqRhs, num_variables),
40 fNumberOfVariables(num_variables) << 49 fNumberOfVariables(num_variables)
41 { 50 {
42 dydxTemp = new G4double[fNumberOfVariables] 51 dydxTemp = new G4double[fNumberOfVariables] ;
43 dydxTemp2 = new G4double[fNumberOfVariables] 52 dydxTemp2 = new G4double[fNumberOfVariables] ;
44 yTemp = new G4double[fNumberOfVariables] 53 yTemp = new G4double[fNumberOfVariables] ;
45 yTemp2 = new G4double[fNumberOfVariables] 54 yTemp2 = new G4double[fNumberOfVariables] ;
46 } 55 }
47 56
>> 57
48 ////////////////////////////////////////////// 58 //////////////////////////////////////////////////////////////////////////
49 // 59 //
50 // Destructor 60 // Destructor
51 // << 61
52 G4SimpleHeum::~G4SimpleHeum() 62 G4SimpleHeum::~G4SimpleHeum()
53 { 63 {
54 delete [] dydxTemp; << 64 delete[] dydxTemp;
55 delete [] dydxTemp2; << 65 delete[] dydxTemp2;
56 delete [] yTemp; << 66 delete[] yTemp;
57 delete [] yTemp2; << 67 delete[] yTemp2;
58 } 68 }
59 69
>> 70
60 ////////////////////////////////////////////// 71 //////////////////////////////////////////////////////////////////////
61 // 72 //
62 // DumbStepper <<
63 // 73 //
>> 74
64 void 75 void
65 G4SimpleHeum::DumbStepper( const G4double yIn[ << 76 G4SimpleHeum::DumbStepper( const G4double yIn[],
66 const G4double dydx << 77 const G4double dydx[],
67 G4double h, << 78 G4double h,
68 G4double yOut << 79 G4double yOut[])
69 { 80 {
70 for( G4int i = 0; i < fNumberOfVariables; ++ << 81 G4int i;
>> 82 for( i = 0; i < fNumberOfVariables; i++ )
71 { 83 {
72 yTemp[i] = yIn[i] + (1.0/3.0) * h * dydx[ 84 yTemp[i] = yIn[i] + (1.0/3.0) * h * dydx[i] ;
73 } 85 }
74 86
75 RightHandSide(yTemp,dydxTemp); 87 RightHandSide(yTemp,dydxTemp);
76 88
77 for( G4int i = 0; i < fNumberOfVariables; ++ << 89 for( i = 0; i < fNumberOfVariables; i++ )
78 { 90 {
79 yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxT 91 yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxTemp[i] ;
80 } 92 }
81 93
82 RightHandSide(yTemp2,dydxTemp2); 94 RightHandSide(yTemp2,dydxTemp2);
83 95
84 for( G4int i = 0; i < fNumberOfVariables; ++ << 96 for( i = 0; i < fNumberOfVariables; i++ )
85 { 97 {
86 yOut[i] = yIn[i] + h * (0.25 * dydx[i] + 0 98 yOut[i] = yIn[i] + h * (0.25 * dydx[i] + 0.75 * dydxTemp2[i]);
87 } 99 }
88 100
89 if ( fNumberOfVariables == 12 ) { NormaliseP 101 if ( fNumberOfVariables == 12 ) { NormalisePolarizationVector( yOut ); }
90 } 102 }
91 103