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25 // 25 //
26 // G4SimpleRunge implementation <<
27 // 26 //
28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997 << 27 // $Id: G4SimpleRunge.cc,v 1.10 2006/06/29 18:24:53 gunter Exp $
>> 28 // GEANT4 tag $Name: geant4-09-01-patch-01 $
>> 29 //
>> 30 // Simple Runge:
>> 31 //
>> 32 // x_1 = x_0 + h * ( dx( t_0+h/2, x_0 + h/2 * dx( t_0, x_0) ) )
>> 33 //
>> 34 // Second order solver.
>> 35 // Takes the derivative at a position to be assumed at the middle of the
>> 36 // Step and adds it to the current position.
>> 37 //
>> 38 //
>> 39 // W.Wander <wwc@mit.edu> 12/09/97
29 // ------------------------------------------- 40 // -------------------------------------------------------------------
30 41
31 #include "G4SimpleRunge.hh" 42 #include "G4SimpleRunge.hh"
32 #include "G4ThreeVector.hh" 43 #include "G4ThreeVector.hh"
33 44
34 ////////////////////////////////////////////// 45 ////////////////////////////////////////////////////////////////
35 // 46 //
36 // Constructor 47 // Constructor
37 // << 48
38 G4SimpleRunge::G4SimpleRunge(G4EquationOfMotio 49 G4SimpleRunge::G4SimpleRunge(G4EquationOfMotion* EqRhs, G4int numberOfVariables)
39 : G4MagErrorStepper(EqRhs, numberOfVariables 50 : G4MagErrorStepper(EqRhs, numberOfVariables),
40 fNumberOfVariables(numberOfVariables) 51 fNumberOfVariables(numberOfVariables)
41 { 52 {
42 53
43 unsigned int noVariables= std::max(numberOf 54 unsigned int noVariables= std::max(numberOfVariables,
44 GetNumbe << 55 GetNumberOfStateVariables());
45 / 56 // To deal with Time >= 7+1
46 dydxTemp = new G4double[noVariables] ; 57 dydxTemp = new G4double[noVariables] ;
47 yTemp = new G4double[noVariables] ; 58 yTemp = new G4double[noVariables] ;
48 } 59 }
49 60
>> 61
50 ////////////////////////////////////////////// 62 /////////////////////////////////////////////////////////////////
51 // 63 //
52 // Destructor 64 // Destructor
53 // << 65
54 G4SimpleRunge::~G4SimpleRunge() 66 G4SimpleRunge::~G4SimpleRunge()
55 { 67 {
56 delete [] dydxTemp; << 68 delete[] dydxTemp;
57 delete [] yTemp; << 69 delete[] yTemp;
58 } 70 }
59 71
60 ////////////////////////////////////////////// 72 //////////////////////////////////////////////////////////////////
61 // 73 //
62 // DumbStepper <<
63 // 74 //
>> 75
64 void 76 void
65 G4SimpleRunge::DumbStepper( const G4double yI 77 G4SimpleRunge::DumbStepper( const G4double yIn[],
66 const G4double dy << 78 const G4double dydx[],
67 G4double h, << 79 G4double h,
68 G4double y << 80 G4double yOut[])
69 { 81 {
70 // Initialise time to t0, needed when it is 82 // Initialise time to t0, needed when it is not updated by the integration.
71 // << 83 yTemp[7] = yOut[7] = yIn[7]; // Better to set it to NaN; // TODO
72 yTemp[7] = yOut[7] = yIn[7]; << 84
>> 85 G4int i;
73 86
74 for( G4int i = 0; i < fNumberOfVariables; ++ << 87 for( i = 0; i < fNumberOfVariables; i++ )
75 { 88 {
76 yTemp[i] = yIn[i] + 0.5 * h*dydx[i] ; 89 yTemp[i] = yIn[i] + 0.5 * h*dydx[i] ;
77 } 90 }
78 91
79 RightHandSide(yTemp,dydxTemp); 92 RightHandSide(yTemp,dydxTemp);
80 93
81 for( G4int i = 0; i < fNumberOfVariables; ++ << 94 for( i = 0; i < fNumberOfVariables; i++ )
82 { 95 {
83 yOut[i] = yIn[i] + h * ( dydxTemp[i] ); 96 yOut[i] = yIn[i] + h * ( dydxTemp[i] );
84 } 97 }
85 } 98 }
86 99