| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer << 3 // * DISCLAIMER *
4 // * 4 // * *
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19 // * technical work of the GEANT4 collaboratio << 17 // * GEANT4 collaboration. *
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4SimpleHeum implementation <<
27 // 23 //
28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997 << 24 // $Id: G4SimpleHeum.cc,v 1.7 2003/11/05 16:31:49 japost Exp $
>> 25 // GEANT4 tag $Name: geant4-07-00-patch-01 $
>> 26 //
>> 27 // Simple Heum:
>> 28 // x_1 = x_0 + h *
>> 29 // 1/4 * dx(t0,x0) +
>> 30 // 3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0))))
>> 31 //
>> 32 // Third order solver.
>> 33 //
>> 34 // W.Wander <wwc@mit.edu> 12/09/97
29 // ------------------------------------------- 35 // -------------------------------------------------------------------
30 36
31 #include "G4SimpleHeum.hh" 37 #include "G4SimpleHeum.hh"
32 #include "G4ThreeVector.hh" 38 #include "G4ThreeVector.hh"
33 39
34 ////////////////////////////////////////////// 40 ///////////////////////////////////////////////////////////////////////////
35 // 41 //
36 // Constructor 42 // Constructor
37 // << 43
38 G4SimpleHeum::G4SimpleHeum(G4EquationOfMotion* << 44 G4SimpleHeum::G4SimpleHeum(G4EquationOfMotion *EqRhs, G4int num_variables):
39 : G4MagErrorStepper(EqRhs, num_variables), << 45 G4MagErrorStepper(EqRhs, num_variables),
40 fNumberOfVariables(num_variables) << 46 fNumberOfVariables(num_variables)
41 { 47 {
42 dydxTemp = new G4double[fNumberOfVariables] 48 dydxTemp = new G4double[fNumberOfVariables] ;
43 dydxTemp2 = new G4double[fNumberOfVariables] 49 dydxTemp2 = new G4double[fNumberOfVariables] ;
44 yTemp = new G4double[fNumberOfVariables] 50 yTemp = new G4double[fNumberOfVariables] ;
45 yTemp2 = new G4double[fNumberOfVariables] 51 yTemp2 = new G4double[fNumberOfVariables] ;
46 } 52 }
47 53
>> 54
48 ////////////////////////////////////////////// 55 //////////////////////////////////////////////////////////////////////////
49 // 56 //
50 // Destructor 57 // Destructor
51 // << 58
52 G4SimpleHeum::~G4SimpleHeum() 59 G4SimpleHeum::~G4SimpleHeum()
53 { 60 {
54 delete [] dydxTemp; << 61 delete[] dydxTemp;
55 delete [] dydxTemp2; << 62 delete[] dydxTemp2;
56 delete [] yTemp; << 63 delete[] yTemp;
57 delete [] yTemp2; << 64 delete[] yTemp2;
58 } 65 }
59 66
>> 67
60 ////////////////////////////////////////////// 68 //////////////////////////////////////////////////////////////////////
61 // 69 //
62 // DumbStepper <<
63 // 70 //
>> 71
64 void 72 void
65 G4SimpleHeum::DumbStepper( const G4double yIn[ << 73 G4SimpleHeum::DumbStepper( const G4double yIn[],
66 const G4double dydx << 74 const G4double dydx[],
67 G4double h, << 75 G4double h,
68 G4double yOut << 76 G4double yOut[])
69 { 77 {
70 for( G4int i = 0; i < fNumberOfVariables; ++ << 78 // const G4int nvar = 6 ;
>> 79
>> 80 G4int i;
>> 81
>> 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] +
>> 99 0.75 * dydxTemp2[i]);
87 } 100 }
88 101
89 if ( fNumberOfVariables == 12 ) { NormaliseP << 102 // NormaliseTangentVector( yOut );
90 } 103 }
91 104