spectral_entropy.hpp

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#ifndef EDSP_SPECTRAL_ENTROPY_HPP
#define EDSP_SPECTRAL_ENTROPY_HPP

#include <edsp/statistics/entropy.hpp>
#include <functional>
#include <algorithm>

namespace edsp { namespace feature { inline namespace spectral {

    template <typename ForwardIt>
    constexpr auto spectral_entropy(ForwardIt first, ForwardIt last) {
        using value_type = typename std::iterator_traits<ForwardIt>::value_type ;
        const auto acc = std::accumulate(first, last, static_cast<value_type >(0));
        std::for_each(first, last, std::bind(std::multiplies<value_type>(), std::placeholders::_1, acc));
        return statistics::entropy(first, last);
    }

}}}
#endif //EDSP_SPECTRAL_ENTROPY_HPP