1 | ///////////////////////////////////////////////////////////////////////////////
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2 | // rolling_mean.hpp
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3 | // Copyright (C) 2005 Eric Niebler
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4 | // Copyright (C) 2011 Pieter Bastiaan Ober (Integricom). Distributed under the Boost
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5 | // Software License, Version 1.0. (See accompanying file
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6 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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7 |
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8 | #ifndef BOOST_ACCUMULATORS_STATISTICS_ROLLING_mean_HPP_EAN_15_11_2011
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9 | #define BOOST_ACCUMULATORS_STATISTICS_ROLLING_mean_HPP_EAN_15_11_2011
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10 |
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11 | #include <boost/accumulators/accumulators.hpp>
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12 | #include <boost/accumulators/statistics/stats.hpp>
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13 |
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14 | #include <boost/mpl/placeholders.hpp>
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15 | #include <boost/accumulators/framework/accumulator_base.hpp>
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16 | #include <boost/accumulators/framework/extractor.hpp>
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17 | #include <boost/accumulators/numeric/functional.hpp>
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18 | #include <boost/accumulators/framework/parameters/sample.hpp>
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19 | #include <boost/accumulators/framework/depends_on.hpp>
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20 | #include <boost/accumulators/statistics_fwd.hpp>
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21 | #include <boost/accumulators/statistics/rolling_window.hpp>
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22 | #include <boost/accumulators/statistics/rolling_count.hpp>
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23 |
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24 | namespace boost { namespace accumulators
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25 | {
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26 | namespace impl
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27 | {
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28 | ///////////////////////////////////////////////////////////////////////////////
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29 | // rolling_mean_impl
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30 | //
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31 | template<typename Sample>
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32 | struct rolling_mean_impl
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33 | : accumulator_base
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34 | {
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35 | typedef Sample result_type;
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36 |
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37 | template<typename Args>
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38 | rolling_mean_impl(Args const &args)
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39 | : mean_(0.0)
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40 | {}
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41 |
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42 | template<typename Args>
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43 | void operator()(Args const &args)
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44 | {
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45 | if(is_rolling_window_plus1_full(args))
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46 | {
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47 | mean_ += (args[sample]-rolling_window_plus1(args).front())/rolling_count(args);
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48 | }
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49 | else
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50 | {
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51 | Sample prev_mean = mean_;
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52 | mean_ += (args[sample]-prev_mean)/rolling_count(args);
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53 | }
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54 | }
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55 |
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56 | template<typename Args>
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57 | result_type result(Args const &args) const
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58 | {
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59 | return mean_;
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60 | }
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61 |
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62 | private:
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63 |
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64 | Sample mean_;
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65 | };
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66 | } // namespace impl
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67 |
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68 | ///////////////////////////////////////////////////////////////////////////////
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69 | // tag:: rolling_mean
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70 | //
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71 | namespace tag
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72 | {
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73 | struct rolling_mean
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74 | : depends_on< rolling_window_plus1, rolling_count>
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75 | {
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76 | /// INTERNAL ONLY
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77 | ///
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78 | typedef accumulators::impl::rolling_mean_impl< mpl::_1 > impl;
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79 |
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80 | #ifdef BOOST_ACCUMULATORS_DOXYGEN_INVOKED
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81 | /// tag::rolling_window::window_size named parameter
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82 | static boost::parameter::keyword<tag::rolling_window_size> const window_size;
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83 | #endif
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84 | };
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85 | } // namespace tag
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86 |
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87 | ///////////////////////////////////////////////////////////////////////////////
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88 | // extract::rolling_mean
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89 | //
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90 | namespace extract
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91 | {
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92 | extractor<tag::rolling_mean> const rolling_mean = {};
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93 |
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94 | BOOST_ACCUMULATORS_IGNORE_GLOBAL(rolling_mean)
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95 | }
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96 |
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97 | using extract::rolling_mean;
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98 |
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99 | }} // namespace boost::accumulators
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100 |
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101 | #endif
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