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1 // 1 //
2 // ******************************************* 2 // ********************************************************************
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4 // * 4 // * *
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17 // * 17 // * *
18 // * This code implementation is the result 18 // * This code implementation is the result of the scientific and *
19 // * technical work of the GEANT4 collaboratio 19 // * technical work of the GEANT4 collaboration. *
20 // * By using, copying, modifying or distri 20 // * By using, copying, modifying or distributing the software (or *
21 // * any work based on the software) you ag 21 // * any work based on the software) you agree to acknowledge its *
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24 // ******************************************* 24 // ********************************************************************
25 // 25 //
26 // G4SimpleRunge implementation 26 // G4SimpleRunge implementation
27 // 27 //
28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997 28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997
29 // ------------------------------------------- 29 // -------------------------------------------------------------------
30 30
31 #include "G4SimpleRunge.hh" 31 #include "G4SimpleRunge.hh"
32 #include "G4ThreeVector.hh" 32 #include "G4ThreeVector.hh"
33 33
34 ////////////////////////////////////////////// 34 ////////////////////////////////////////////////////////////////
35 // 35 //
36 // Constructor 36 // Constructor
37 // 37 //
38 G4SimpleRunge::G4SimpleRunge(G4EquationOfMotio 38 G4SimpleRunge::G4SimpleRunge(G4EquationOfMotion* EqRhs, G4int numberOfVariables)
39 : G4MagErrorStepper(EqRhs, numberOfVariables 39 : G4MagErrorStepper(EqRhs, numberOfVariables),
40 fNumberOfVariables(numberOfVariables) 40 fNumberOfVariables(numberOfVariables)
41 { 41 {
42 42
43 unsigned int noVariables= std::max(numberOf 43 unsigned int noVariables= std::max(numberOfVariables,
44 GetNumbe 44 GetNumberOfStateVariables());
45 / 45 // To deal with Time >= 7+1
46 dydxTemp = new G4double[noVariables] ; 46 dydxTemp = new G4double[noVariables] ;
47 yTemp = new G4double[noVariables] ; 47 yTemp = new G4double[noVariables] ;
48 } 48 }
49 49
50 ////////////////////////////////////////////// 50 /////////////////////////////////////////////////////////////////
51 // 51 //
52 // Destructor 52 // Destructor
53 // 53 //
54 G4SimpleRunge::~G4SimpleRunge() 54 G4SimpleRunge::~G4SimpleRunge()
55 { 55 {
56 delete [] dydxTemp; 56 delete [] dydxTemp;
57 delete [] yTemp; 57 delete [] yTemp;
58 } 58 }
59 59
60 ////////////////////////////////////////////// 60 //////////////////////////////////////////////////////////////////
61 // 61 //
62 // DumbStepper 62 // DumbStepper
63 // 63 //
64 void 64 void
65 G4SimpleRunge::DumbStepper( const G4double yI 65 G4SimpleRunge::DumbStepper( const G4double yIn[],
66 const G4double dy 66 const G4double dydx[],
67 G4double h, 67 G4double h,
68 G4double y 68 G4double yOut[] )
69 { 69 {
70 // Initialise time to t0, needed when it is 70 // Initialise time to t0, needed when it is not updated by the integration.
71 // 71 //
72 yTemp[7] = yOut[7] = yIn[7]; 72 yTemp[7] = yOut[7] = yIn[7];
73 73
74 for( G4int i = 0; i < fNumberOfVariables; ++ 74 for( G4int i = 0; i < fNumberOfVariables; ++i )
75 { 75 {
76 yTemp[i] = yIn[i] + 0.5 * h*dydx[i] ; 76 yTemp[i] = yIn[i] + 0.5 * h*dydx[i] ;
77 } 77 }
78 78
79 RightHandSide(yTemp,dydxTemp); 79 RightHandSide(yTemp,dydxTemp);
80 80
81 for( G4int i = 0; i < fNumberOfVariables; ++ 81 for( G4int i = 0; i < fNumberOfVariables; ++i )
82 { 82 {
83 yOut[i] = yIn[i] + h * ( dydxTemp[i] ); 83 yOut[i] = yIn[i] + h * ( dydxTemp[i] );
84 } 84 }
85 } 85 }
86 86