104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
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///////////////////////////////////////////////////////////////////////////////
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// weighted_moment.hpp
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//
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// Copyright 2006, Eric Niebler, Olivier Gygi. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_ACCUMULATORS_STATISTICS_WEIGHTED_MOMENT_HPP_EAN_15_11_2005
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#define BOOST_ACCUMULATORS_STATISTICS_WEIGHTED_MOMENT_HPP_EAN_15_11_2005
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#include <boost/config/no_tr1/cmath.hpp>
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#include <boost/mpl/int.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/mpl/placeholders.hpp>
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#include <boost/preprocessor/arithmetic/inc.hpp>
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#include <boost/preprocessor/repetition/repeat_from_to.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_params.hpp>
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#include <boost/preprocessor/repetition/enum_trailing_binary_params.hpp>
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#include <boost/accumulators/framework/accumulator_base.hpp>
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#include <boost/accumulators/framework/extractor.hpp>
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#include <boost/accumulators/numeric/functional.hpp>
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#include <boost/accumulators/framework/parameters/sample.hpp>
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#include <boost/accumulators/framework/depends_on.hpp>
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#include <boost/accumulators/statistics_fwd.hpp>
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#include <boost/accumulators/statistics/count.hpp>
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#include <boost/accumulators/statistics/moment.hpp> // for pow()
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#include <boost/accumulators/statistics/sum.hpp>
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namespace boost { namespace accumulators
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{
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namespace impl
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{
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///////////////////////////////////////////////////////////////////////////////
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// weighted_moment_impl
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template<typename N, typename Sample, typename Weight>
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struct weighted_moment_impl
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: accumulator_base // TODO: also depends_on sum of powers
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{
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BOOST_MPL_ASSERT_RELATION(N::value, >, 0);
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typedef typename numeric::functional::multiplies<Sample, Weight>::result_type weighted_sample;
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// for boost::result_of
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typedef typename numeric::functional::fdiv<weighted_sample, Weight>::result_type result_type;
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template<typename Args>
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weighted_moment_impl(Args const &args)
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: sum(args[sample | Sample()] * numeric::one<Weight>::value)
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{
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}
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template<typename Args>
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void operator ()(Args const &args)
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{
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this->sum += args[weight] * numeric::pow(args[sample], N());
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}
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template<typename Args>
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result_type result(Args const &args) const
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{
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return numeric::fdiv(this->sum, sum_of_weights(args));
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}
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// make this accumulator serializeable
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template<class Archive>
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void serialize(Archive & ar, const unsigned int file_version)
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{
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ar & sum;
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}
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private:
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weighted_sample sum;
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};
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} // namespace impl
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///////////////////////////////////////////////////////////////////////////////
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// tag::weighted_moment
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//
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namespace tag
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{
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template<int N>
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struct weighted_moment
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: depends_on<count, sum_of_weights>
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{
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/// INTERNAL ONLY
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///
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typedef accumulators::impl::weighted_moment_impl<mpl::int_<N>, mpl::_1, mpl::_2> impl;
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};
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}
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///////////////////////////////////////////////////////////////////////////////
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// extract::weighted_moment
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//
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namespace extract
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{
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BOOST_ACCUMULATORS_DEFINE_EXTRACTOR(tag, weighted_moment, (int))
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}
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using extract::weighted_moment;
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}} // namespace boost::accumulators
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#endif
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