1 | #ifndef _theplu_yat_normalizer_centralizer_ |
---|
2 | #define _theplu_yat_normalizer_centralizer_ |
---|
3 | |
---|
4 | // $Id: Centralizer.h 2119 2009-12-12 23:11:43Z peter $ |
---|
5 | |
---|
6 | /* |
---|
7 | Copyright (C) 2008 Jari Häkkinen, Peter Johansson |
---|
8 | Copyright (C) 2009 Peter Johansson |
---|
9 | |
---|
10 | This file is part of the yat library, http://dev.thep.lu.se/yat |
---|
11 | |
---|
12 | The yat library is free software; you can redistribute it and/or |
---|
13 | modify it under the terms of the GNU General Public License as |
---|
14 | published by the Free Software Foundation; either version 3 of the |
---|
15 | License, or (at your option) any later version. |
---|
16 | |
---|
17 | The yat library is distributed in the hope that it will be useful, |
---|
18 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
---|
20 | General Public License for more details. |
---|
21 | |
---|
22 | You should have received a copy of the GNU General Public License |
---|
23 | along with yat. If not, see <http://www.gnu.org/licenses/>. |
---|
24 | */ |
---|
25 | |
---|
26 | #include "yat/statistics/Average.h" |
---|
27 | #include "yat/utility/DataIterator.h" |
---|
28 | #include "yat/utility/iterator_traits.h" |
---|
29 | #include "yat/utility/WeightIterator.h" |
---|
30 | |
---|
31 | #include <algorithm> |
---|
32 | #include <functional> |
---|
33 | |
---|
34 | namespace theplu { |
---|
35 | namespace yat { |
---|
36 | namespace normalizer { |
---|
37 | |
---|
38 | /** |
---|
39 | \brief Centralize a range |
---|
40 | |
---|
41 | The center is calculated and then that value is subtracted from |
---|
42 | each element. By default the center is defined as the arithmetic |
---|
43 | mean, but this can be changed by providing a suitable |
---|
44 | UnaryFunction. |
---|
45 | |
---|
46 | \since New in yat 0.5 |
---|
47 | */ |
---|
48 | template<class UnaryFunction = statistics::Average> |
---|
49 | class Centralizer |
---|
50 | { |
---|
51 | public: |
---|
52 | /** |
---|
53 | \brief default constructor |
---|
54 | |
---|
55 | Internal UnaryFunction is created using its default |
---|
56 | constructor. |
---|
57 | */ |
---|
58 | Centralizer(void){} |
---|
59 | |
---|
60 | /** |
---|
61 | \param uf unary function defining the center. |
---|
62 | */ |
---|
63 | Centralizer(const UnaryFunction& uf) |
---|
64 | : func_(uf) {} |
---|
65 | |
---|
66 | /** |
---|
67 | Calculates the center \a c of the range [first, last) using |
---|
68 | UnaryFunction. This value, \a c, is then subtracted from each |
---|
69 | element in the range [first, last) and assigned to the |
---|
70 | corresponding element in range [result, result + (last-first) ). |
---|
71 | |
---|
72 | It is possible to centralize a range "in place"; it is |
---|
73 | permissible for the iterators \a first and \a result to be the |
---|
74 | same. |
---|
75 | |
---|
76 | \see std::transform |
---|
77 | */ |
---|
78 | template<class InputIterator, class OutputIterator> |
---|
79 | void operator()(InputIterator first, InputIterator last, |
---|
80 | OutputIterator result) const |
---|
81 | { |
---|
82 | typename utility::weighted_iterator_traits<InputIterator>::type tag; |
---|
83 | normalize(first, last, result, tag); |
---|
84 | } |
---|
85 | |
---|
86 | private: |
---|
87 | UnaryFunction func_; |
---|
88 | |
---|
89 | // unweighted version |
---|
90 | template<class InputIterator, class OutputIterator> |
---|
91 | void normalize(InputIterator first,InputIterator last,OutputIterator result, |
---|
92 | utility::unweighted_iterator_tag tag) const |
---|
93 | { |
---|
94 | std::transform(first, last, result, |
---|
95 | std::bind2nd(std::minus<double>(), func_(first, last))); |
---|
96 | } |
---|
97 | |
---|
98 | |
---|
99 | // weighted version |
---|
100 | template<class InputIterator, class OutputIterator> |
---|
101 | void normalize(InputIterator first,InputIterator last,OutputIterator result, |
---|
102 | utility::weighted_iterator_tag tag) const |
---|
103 | { |
---|
104 | std::copy(utility::weight_iterator(first), |
---|
105 | utility::weight_iterator(last), |
---|
106 | utility::weight_iterator(result)); |
---|
107 | std::transform(utility::data_iterator(first), |
---|
108 | utility::data_iterator(last), |
---|
109 | utility::data_iterator(result), |
---|
110 | std::bind2nd(std::minus<double>(),func_(first, last))); |
---|
111 | } |
---|
112 | |
---|
113 | }; |
---|
114 | |
---|
115 | }}} // end of namespace normalizer, yat and thep |
---|
116 | #endif |
---|