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da0e9ce3 | 1 | //-------------------------------------------------------------------------- |
2 | // | |
3 | // Environment: | |
4 | // This software is part of the EvtGen package developed jointly | |
5 | // for the BaBar and CLEO collaborations. If you use all or part | |
6 | // of it, please give an appropriate acknowledgement. | |
7 | // | |
8 | // Copyright Information: See EvtGen/COPYRIGHT | |
9 | // Copyright (C) 2002 Caltech | |
10 | // | |
11 | // Module: EvtAmp.cc | |
12 | // | |
13 | // Description: Class to manipulate the amplitudes in the decays. | |
14 | // | |
15 | // Modification history: | |
16 | // | |
17 | // RYD Nov 22, 2002 Module created | |
18 | // | |
19 | //------------------------------------------------------------------------ | |
20 | // | |
21 | #include "EvtGenBase/EvtPatches.hh" | |
22 | #include "EvtGenBase/EvtAmpIndex.hh" | |
23 | #include <vector> | |
24 | using std::vector; | |
25 | ||
26 | ||
27 | EvtAmpIndex::EvtAmpIndex(std::vector<int> ind): | |
28 | _ind(ind), | |
29 | _size(ind.size()), | |
30 | _state(ind.size()), | |
31 | _nstate(ind.size()) | |
32 | { | |
33 | int i; | |
34 | ||
35 | for(i=0;i<_size;i++) { | |
36 | _state[i]=0; | |
37 | if (i==0){ | |
38 | _nstate[i]=1; | |
39 | } | |
40 | else{ | |
41 | _nstate[i]=_nstate[i-1]*_ind[i]; | |
42 | } | |
43 | } | |
44 | } | |
45 | ||
46 | ||
47 | void EvtAmpIndex::reset(){ | |
48 | int i; | |
49 | for(i=0;i<_size;i++) { | |
50 | _state[i]=0; | |
51 | } | |
52 | } | |
53 | ||
54 | bool EvtAmpIndex::next(){ | |
55 | int i; | |
56 | for(i=0;i<_size;i++) { | |
57 | _state[i]++; | |
58 | if (_state[i]<_ind[i]){ | |
59 | return true; | |
60 | } | |
61 | else{ | |
62 | _state[i]=0; | |
63 | } | |
64 | } | |
65 | return false; | |
66 | } | |
67 | ||
68 | int EvtAmpIndex::index(){ | |
69 | ||
70 | int i; | |
71 | int ind=0; | |
72 | ||
73 | for(i=0;i<_size;i++) { | |
74 | ind+=_state[i]*_nstate[i]; | |
75 | } | |
76 | ||
77 | return ind; | |
78 | ||
79 | } | |
80 | ||
81 | ||
82 | ||
83 | ||
84 | ||
85 | ||
86 | ||
87 | ||
88 | ||
89 | ||
90 |