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96 lines
3.1 KiB
96 lines
3.1 KiB
/////////////////////////////////////////////////////////////////////////////// |
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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::average<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::average(this->sum, sum_of_weights(args)); |
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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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