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#ifndef _theplu_yat_normalizer_unity_scaler_ |
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#define _theplu_yat_normalizer_unity_scaler_ |
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|
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// $Id$ |
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/* |
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Copyright (C) 2020, 2022 Peter Johansson |
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This file is part of the yat library, http://dev.thep.lu.se/yat |
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|
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The yat library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License as |
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published by the Free Software Foundation; either version 3 of the |
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License, or (at your option) any later version. |
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|
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The yat library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with yat. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#include "RangeNormalizer.h" |
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#include "yat/statistics/AveragerWeighted.h" |
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#include "yat/utility/DataIterator.h" |
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#include <functional> |
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#include <numeric> |
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|
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namespace theplu { |
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namespace yat { |
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namespace normalizer { |
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|
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/// \cond IGNORE_DOXYGEN |
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namespace detail { |
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class UnityScalerFactor |
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{ |
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public: |
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// return the inverse of the sum of range [first, last) |
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template<typename Iterator> |
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double operator()(Iterator first, Iterator last) const |
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{ |
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using traits = typename utility::weighted_iterator_traits<Iterator>; |
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return calculate(first, last, typename traits::type()); |
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} |
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|
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private: |
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|
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template<typename Iterator> |
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double calculate(Iterator first, Iterator last, |
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utility::unweighted_iterator_tag tag) const |
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{ |
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return 1.0 / std::accumulate(utility::data_iterator(first), |
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utility::data_iterator(last), |
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0.0); |
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} |
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|
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template<typename Iterator> |
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double calculate(Iterator first, Iterator last, |
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utility::weighted_iterator_tag tag) const |
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{ |
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statistics::AveragerWeighted averager; |
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add(averager, first, last); |
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return 1.0 / averager.sum_wx(); |
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} |
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}; |
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} |
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/// \endcond |
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/** |
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\brief Scale a range to unity |
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|
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The sum of input range is calculated. If the input range is |
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unweighted: \f$\sum x_i \f$; if the input range is weighted: \f$ |
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\sum w_i x_i \f$ and the data value in the result range is |
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calculated as the <tt> result[i] = input[i] / sum |
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</tt>. Consequently, the sum of elements in the resulting range |
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is unity, except in the case when the input range is weighted and |
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the result range is unweighed the information about the weights |
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gets lost. |
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|
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\since New in yat 0.18 |
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*/ |
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using UnityScaler = |
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RangeNormalizer<detail::UnityScalerFactor, std::multiplies<double>>; |
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|
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}}} // end of namespace normalizer, yat and thep |
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#endif |