| Geant4 Cross Reference |
1 // 1 //
2 // ******************************************* 2 // ********************************************************************
3 // * License and Disclaimer << 3 // * DISCLAIMER *
4 // * 4 // * *
5 // * The Geant4 software is copyright of th << 5 // * The following disclaimer summarizes all the specific disclaimers *
6 // * the Geant4 Collaboration. It is provided << 6 // * of contributors to this software. The specific disclaimers,which *
7 // * conditions of the Geant4 Software License << 7 // * govern, are listed with their locations in: *
8 // * LICENSE and available at http://cern.ch/ << 8 // * http://cern.ch/geant4/license *
9 // * include a list of copyright holders. <<
10 // * 9 // * *
11 // * Neither the authors of this software syst 10 // * Neither the authors of this software system, nor their employing *
12 // * institutes,nor the agencies providing fin 11 // * institutes,nor the agencies providing financial support for this *
13 // * work make any representation or warran 12 // * work make any representation or warranty, express or implied, *
14 // * regarding this software system or assum 13 // * regarding this software system or assume any liability for its *
15 // * use. Please see the license in the file << 14 // * use. *
16 // * for the full disclaimer and the limitatio <<
17 // * 15 // * *
18 // * This code implementation is the result << 16 // * This code implementation is the intellectual property of the *
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 *
21 // * any work based on the software) you ag << 19 // * based on the Program) you indicate your acceptance of this *
22 // * use in resulting scientific publicati << 20 // * statement, and all its terms. *
23 // * acceptance of all terms of the Geant4 Sof <<
24 // ******************************************* 21 // ********************************************************************
25 // 22 //
26 // G4SimpleHeum implementation <<
27 // 23 //
28 // Created: W.Wander <wwc@mit.edu>, 12/09/1997 << 24 // $Id: G4SimpleHeum.cc,v 1.5 2001/07/11 09:59:13 gunter Exp $
29 // ------------------------------------------- << 25 // GEANT4 tag $Name: geant4-05-02 $
>> 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
>> 35 // 6.11.98. V.Grichine new data member fNumberOfVariables
>> 36
30 37
31 #include "G4SimpleHeum.hh" 38 #include "G4SimpleHeum.hh"
32 #include "G4ThreeVector.hh" 39 #include "G4ThreeVector.hh"
33 40
34 ////////////////////////////////////////////// 41 ///////////////////////////////////////////////////////////////////////////
35 // 42 //
36 // Constructor 43 // Constructor
37 // << 44
38 G4SimpleHeum::G4SimpleHeum(G4EquationOfMotion* << 45 G4SimpleHeum::G4SimpleHeum(G4Mag_EqRhs *EqRhs, G4int num_variables):
39 : G4MagErrorStepper(EqRhs, num_variables), << 46 G4MagErrorStepper(EqRhs, num_variables),
40 fNumberOfVariables(num_variables) << 47 fNumberOfVariables(num_variables)
41 { 48 {
42 dydxTemp = new G4double[fNumberOfVariables] 49 dydxTemp = new G4double[fNumberOfVariables] ;
43 dydxTemp2 = new G4double[fNumberOfVariables] 50 dydxTemp2 = new G4double[fNumberOfVariables] ;
44 yTemp = new G4double[fNumberOfVariables] 51 yTemp = new G4double[fNumberOfVariables] ;
45 yTemp2 = new G4double[fNumberOfVariables] 52 yTemp2 = new G4double[fNumberOfVariables] ;
46 } 53 }
47 54
>> 55
48 ////////////////////////////////////////////// 56 //////////////////////////////////////////////////////////////////////////
49 // 57 //
50 // Destructor 58 // Destructor
51 // << 59
52 G4SimpleHeum::~G4SimpleHeum() 60 G4SimpleHeum::~G4SimpleHeum()
53 { 61 {
54 delete [] dydxTemp; << 62 delete[] dydxTemp;
55 delete [] dydxTemp2; << 63 delete[] dydxTemp2;
56 delete [] yTemp; << 64 delete[] yTemp;
57 delete [] yTemp2; << 65 delete[] yTemp2;
58 } 66 }
59 67
>> 68
60 ////////////////////////////////////////////// 69 //////////////////////////////////////////////////////////////////////
61 // 70 //
62 // DumbStepper <<
63 // 71 //
>> 72
64 void 73 void
65 G4SimpleHeum::DumbStepper( const G4double yIn[ << 74 G4SimpleHeum::DumbStepper( const G4double yIn[],
66 const G4double dydx << 75 const G4double dydx[],
67 G4double h, << 76 G4double h,
68 G4double yOut << 77 G4double yOut[])
69 { 78 {
70 for( G4int i = 0; i < fNumberOfVariables; ++ << 79 // const G4int nvar = 6 ;
>> 80
>> 81 G4int i;
>> 82
>> 83 for( i = 0; i < fNumberOfVariables; i++ )
71 { 84 {
72 yTemp[i] = yIn[i] + (1.0/3.0) * h * dydx[ 85 yTemp[i] = yIn[i] + (1.0/3.0) * h * dydx[i] ;
73 } 86 }
74 87
75 RightHandSide(yTemp,dydxTemp); 88 RightHandSide(yTemp,dydxTemp);
76 89
77 for( G4int i = 0; i < fNumberOfVariables; ++ << 90 for( i = 0; i < fNumberOfVariables; i++ )
78 { 91 {
79 yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxT 92 yTemp2[i] = yIn[i] + (2.0/3.0) * h * dydxTemp[i] ;
80 } 93 }
81 94
82 RightHandSide(yTemp2,dydxTemp2); 95 RightHandSide(yTemp2,dydxTemp2);
83 96
84 for( G4int i = 0; i < fNumberOfVariables; ++ << 97 for( i = 0; i < fNumberOfVariables; i++ )
85 { 98 {
86 yOut[i] = yIn[i] + h * (0.25 * dydx[i] + 0 << 99 yOut[i] = yIn[i] + h * ( 0.25 * dydx[i] +
>> 100 0.75 * dydxTemp2[i]);
87 } 101 }
88 102
89 if ( fNumberOfVariables == 12 ) { NormaliseP << 103 // NormaliseTangentVector( yOut );
>> 104
>> 105 return ;
90 } 106 }
91 107