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