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>> 1 // This code implementation is the intellectual property of
>> 2 // the GEANT4 collaboration.
1 // 3 //
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13 // * work make any representation or warran <<
14 // * regarding this software system or assum <<
15 // * use. Please see the license in the file <<
16 // * for the full disclaimer and the limitatio <<
17 // * <<
18 // * This code implementation is the result <<
19 // * technical work of the GEANT4 collaboratio <<
20 // * By using, copying, modifying or distri <<
21 // * any work based on the software) you ag <<
22 // * use in resulting scientific publicati <<
23 // * acceptance of all terms of the Geant4 Sof <<
24 // ******************************************* <<
25 // 7 //
26 // G4SimpleHeum implementation << 8 // $Id: G4SimpleHeum.cc,v 1.2.8.1 1999/12/07 20:48:06 gunter Exp $
>> 9 // GEANT4 tag $Name: geant4-01-00 $
27 // 10 //
28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997 << 11 // Simple Heum:
29 // ------------------------------------------- << 12 // x_1 = x_0 + h *
>> 13 // 1/4 * dx(t0,x0) +
>> 14 // 3/4 * dx(t0+2/3*h, x0+2/3*h*(dx(t0+h/3,x0+h/3*dx(t0,x0))))
>> 15 //
>> 16 // third order solver
>> 17 //
>> 18 // W.Wander <wwc@mit.edu> 12/09/97
>> 19 // 6.11.98. V.Grichine new data member fNumberOfVariables
>> 20
30 21
31 #include "G4SimpleHeum.hh" 22 #include "G4SimpleHeum.hh"
32 #include "G4ThreeVector.hh" 23 #include "G4ThreeVector.hh"
33 24
34 ////////////////////////////////////////////// 25 ///////////////////////////////////////////////////////////////////////////
35 // 26 //
36 // Constructor 27 // Constructor
37 // << 28
38 G4SimpleHeum::G4SimpleHeum(G4EquationOfMotion* << 29 G4SimpleHeum::G4SimpleHeum(G4Mag_EqRhs *EqRhs, G4int num_variables):
39 : G4MagErrorStepper(EqRhs, num_variables), << 30 G4MagErrorStepper(EqRhs, num_variables),
40 fNumberOfVariables(num_variables) << 31 fNumberOfVariables(num_variables)
41 { 32 {
42 dydxTemp = new G4double[fNumberOfVariables] 33 dydxTemp = new G4double[fNumberOfVariables] ;
43 dydxTemp2 = new G4double[fNumberOfVariables] 34 dydxTemp2 = new G4double[fNumberOfVariables] ;
44 yTemp = new G4double[fNumberOfVariables] 35 yTemp = new G4double[fNumberOfVariables] ;
45 yTemp2 = new G4double[fNumberOfVariables] 36 yTemp2 = new G4double[fNumberOfVariables] ;
46 } 37 }
47 38
>> 39
48 ////////////////////////////////////////////// 40 //////////////////////////////////////////////////////////////////////////
49 // 41 //
50 // Destructor 42 // Destructor
51 // << 43
52 G4SimpleHeum::~G4SimpleHeum() 44 G4SimpleHeum::~G4SimpleHeum()
53 { 45 {
54 delete [] dydxTemp; << 46 delete[] dydxTemp;
55 delete [] dydxTemp2; << 47 delete[] dydxTemp2;
56 delete [] yTemp; << 48 delete[] yTemp;
57 delete [] yTemp2; << 49 delete[] yTemp2;
58 } 50 }
59 51
>> 52
60 ////////////////////////////////////////////// 53 //////////////////////////////////////////////////////////////////////
61 // 54 //
62 // DumbStepper <<
63 // 55 //
>> 56
64 void 57 void
65 G4SimpleHeum::DumbStepper( const G4double yIn[ << 58 G4SimpleHeum::DumbStepper( const G4double yIn[],
66 const G4double dydx << 59 const G4double dydx[],
67 G4double h, << 60 const G4double h,
68 G4double yOut << 61 G4double yOut[])
69 { 62 {
70 for( G4int i = 0; i < fNumberOfVariables; ++ << 63 // const G4int nvar = 6 ;
>> 64
>> 65 G4int i;
>> 66
>> 67 for( i = 0; i < fNumberOfVariables; i++ )
71 { 68 {
72 yTemp[i] = yIn[i] + (1.0/3.0) * h * dydx[ 69 yTemp[i] = yIn[i] + (1.0/3.0) * h * dydx[i] ;
73 } 70 }
74 71
75 RightHandSide(yTemp,dydxTemp); 72 RightHandSide(yTemp,dydxTemp);
76 73
77 for( G4int i = 0; i < fNumberOfVariables; ++ << 74 for( i = 0; i < fNumberOfVariables; i++ )
78 { 75 {
79 yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxT 76 yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxTemp[i] ;
80 } 77 }
81 78
82 RightHandSide(yTemp2,dydxTemp2); 79 RightHandSide(yTemp2,dydxTemp2);
83 80
84 for( G4int i = 0; i < fNumberOfVariables; ++ << 81 for( i = 0; i < fNumberOfVariables; i++ )
85 { 82 {
86 yOut[i] = yIn[i] + h * (0.25 * dydx[i] + 0 << 83 yOut[i] = yIn[i] + h * ( 0.25 * dydx[i] +
>> 84 0.75 * dydxTemp2[i]);
87 } 85 }
88 86
89 if ( fNumberOfVariables == 12 ) { NormaliseP << 87 // NormaliseTangentVector( yOut );
>> 88
>> 89 return ;
90 } 90 }
91 91