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1 // 1 //
2 // ******************************************* 2 // ********************************************************************
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19 // * technical work of the GEANT4 collaboratio << 17 // * GEANT4 collaboration. *
20 // * By using, copying, modifying or distri << 18 // * By copying, distributing or modifying the Program (or any work *
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24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4SimpleRunge implementation <<
27 // 23 //
28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997 << 24 // $Id: G4SimpleRunge.cc,v 1.4 2001/07/11 09:59:13 gunter Exp $
29 // ------------------------------------------- << 25 // GEANT4 tag $Name: geant4-04-00 $
>> 26 //
>> 27 // Simple Runge:
>> 28 //
>> 29 // x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) )
>> 30 //
>> 31 // second order solver
>> 32 // take the derivative at a position to be assumed at the middle of the
>> 33 // Step and add it to the current position.
>> 34 //
>> 35 //
>> 36 // W.Wander <wwc@mit.edu> 12/09/97
>> 37 // 6.11.98 V.Grichine new data member fNumberOfVariables
>> 38 //
>> 39
30 40
31 #include "G4SimpleRunge.hh" 41 #include "G4SimpleRunge.hh"
32 #include "G4ThreeVector.hh" 42 #include "G4ThreeVector.hh"
33 43
34 ////////////////////////////////////////////// 44 ////////////////////////////////////////////////////////////////
35 // 45 //
36 // Constructor 46 // Constructor
37 // << 47
38 G4SimpleRunge::G4SimpleRunge(G4EquationOfMotio << 48 G4SimpleRunge::G4SimpleRunge(G4Mag_EqRhs *EqRhs, G4int numberOfVariables)
39 : G4MagErrorStepper(EqRhs, numberOfVariables 49 : G4MagErrorStepper(EqRhs, numberOfVariables),
40 fNumberOfVariables(numberOfVariables) 50 fNumberOfVariables(numberOfVariables)
41 { 51 {
42 << 52 dydxTemp = new G4double[fNumberOfVariables] ;
43 unsigned int noVariables= std::max(numberOf << 53 yTemp = new G4double[fNumberOfVariables] ;
44 GetNumbe <<
45 / <<
46 dydxTemp = new G4double[noVariables] ; <<
47 yTemp = new G4double[noVariables] ; <<
48 } 54 }
49 55
>> 56
50 ////////////////////////////////////////////// 57 /////////////////////////////////////////////////////////////////
51 // 58 //
52 // Destructor 59 // Destructor
53 // << 60
54 G4SimpleRunge::~G4SimpleRunge() 61 G4SimpleRunge::~G4SimpleRunge()
55 { 62 {
56 delete [] dydxTemp; << 63 ;
57 delete [] yTemp; <<
58 } 64 }
59 65
>> 66
60 ////////////////////////////////////////////// 67 //////////////////////////////////////////////////////////////////
61 // 68 //
62 // DumbStepper <<
63 // 69 //
>> 70
64 void 71 void
65 G4SimpleRunge::DumbStepper( const G4double yI 72 G4SimpleRunge::DumbStepper( const G4double yIn[],
66 const G4double dy << 73 const G4double dydx[],
67 G4double h, << 74 G4double h,
68 G4double y << 75 G4double yOut[])
69 { 76 {
70 // Initialise time to t0, needed when it is << 77 // const G4int nvar = 6 ;
71 // << 78 G4int i;
72 yTemp[7] = yOut[7] = yIn[7]; <<
73 79
74 for( G4int i = 0; i < fNumberOfVariables; ++ << 80 for( i = 0; i < fNumberOfVariables; i++ )
75 { 81 {
76 yTemp[i] = yIn[i] + 0.5 * h*dydx[i] ; 82 yTemp[i] = yIn[i] + 0.5 * h*dydx[i] ;
77 } 83 }
78 84
79 RightHandSide(yTemp,dydxTemp); 85 RightHandSide(yTemp,dydxTemp);
80 86
81 for( G4int i = 0; i < fNumberOfVariables; ++ << 87 for( i = 0; i < fNumberOfVariables; i++ )
82 { 88 {
83 yOut[i] = yIn[i] + h * ( dydxTemp[i] ); 89 yOut[i] = yIn[i] + h * ( dydxTemp[i] );
84 } 90 }
>> 91
>> 92 // NormaliseTangentVector( yOut );
>> 93
>> 94 return ;
85 } 95 }
86 96