| Geant4 Cross Reference |
1 // 1
2 // *******************************************
3 // * License and Disclaimer
4 // *
5 // * The Geant4 software is copyright of th
6 // * the Geant4 Collaboration. It is provided
7 // * conditions of the Geant4 Software License
8 // * LICENSE and available at http://cern.ch/
9 // * include a list of copyright holders.
10 // *
11 // * Neither the authors of this software syst
12 // * institutes,nor the agencies providing fin
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 //
26 // G4ErrorMag_UsualEqRhs implementation
27 //
28 // Created: P.Arce, September 2004.
29 // -------------------------------------------
30
31 #include "G4ErrorMag_UsualEqRhs.hh"
32 #include "G4ErrorPropagatorData.hh"
33
34 //--------------------------------------------
35
36 G4ErrorMag_UsualEqRhs::G4ErrorMag_UsualEqRhs(
37 : G4Mag_UsualEqRhs( MagField )
38 {
39 }
40
41 G4ErrorMag_UsualEqRhs::~G4ErrorMag_UsualEqRhs(
42
43 //--------------------------------------------
44
45 void
46 G4ErrorMag_UsualEqRhs::EvaluateRhsGivenB( cons
47 cons
48
49 {
50
51 G4Mag_UsualEqRhs::EvaluateRhsGivenB(y, B, dy
52
53 if(G4ErrorPropagatorData::GetErrorPropagator
54 == G4ErrorMode_PropBackwards)
55 {
56 G4double momentum_mag_square = sqr(y[3]) +
57 G4double inv_momentum_magnitude = 1.0 / st
58
59 G4double cof = FCof()*inv_momentum_magnitu
60
61 dydx[3] = cof*(y[4]*(-B[2]) - y[5]*(-B[1])
62 dydx[4] = cof*(y[5]*(-B[0]) - y[3]*(-B[2])
63 dydx[5] = cof*(y[3]*(-B[1]) - y[4]*(-B[0])
64 }
65 return;
66 }
67