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#ifndef _theplu_yat_statistics_smoother_ |
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#define _theplu_yat_statistics_smoother_ |
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|
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// $Id$ |
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|
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/* |
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Copyright (C) 2008 Jari Häkkinen, Peter Johansson |
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Copyright (C) 2009, 2010, 2016 Peter Johansson |
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|
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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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|
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|
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#include "yat/utility/concept_check.h" |
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#include "yat/utility/iterator_traits.h" |
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|
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#include <boost/concept_check.hpp> |
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#include <boost/iterator/iterator_concepts.hpp> |
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|
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#include <vector> |
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|
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namespace theplu { |
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namespace yat { |
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namespace regression { |
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class Kernel; |
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} |
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namespace statistics { |
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|
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/** |
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@brief Estimating a distribution in a smooth fashion |
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|
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\since New in yat 0.5 |
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*/ |
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class Smoother |
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{ |
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public: |
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/** |
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Constructor taking vector describing for which values |
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distribution should be estimated. |
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|
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\note if \a values are not sorted the behavior is undefined |
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*/ |
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Smoother(const regression::Kernel&, double width, |
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const std::vector<double>& values); |
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|
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/** |
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Constructor creating observation points equally distributed |
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between \a xmin and \a xmax. |
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|
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\param kernel doing the smoothing |
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\param width |
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\param xmin smallest observation point |
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\param xmax largest observation point |
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\param n number of observation points |
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*/ |
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Smoother(const regression::Kernel& kernel, double width, |
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double xmin, double xmax, size_t n); |
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|
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/** |
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\brief Add a data point. |
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*/ |
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void add(double x, double weight=1.0); |
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|
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/** |
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\brief estimated values |
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*/ |
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const std::vector<double>& density(void) const; |
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|
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/** |
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multiply each value with \a factor |
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|
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\since New in yat 0.6 |
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*/ |
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void rescale(double factor); |
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|
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/** |
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\brief reset density to zero |
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*/ |
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void reset(void); |
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|
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/** |
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\brief values in which distribution is estimated |
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*/ |
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const std::vector<double>& value(void) const; |
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|
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private: |
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std::vector<double> density_; |
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const regression::Kernel& kernel_; |
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double width_; |
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std::vector<double> x_; |
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}; |
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|
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/** |
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Add a range [first, last) of values to Smoother. |
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|
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Type Requirements: |
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- \c Iterator must be a \ref concept_data_iterator |
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- \c Iterator must be a \single_pass_iterator |
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|
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\relates Smoother |
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*/ |
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template<typename Iterator> |
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void add(Smoother& h, Iterator first, Iterator last) |
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{ |
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BOOST_CONCEPT_ASSERT((utility::DataIteratorConcept<Iterator>)); |
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BOOST_CONCEPT_ASSERT((boost_concepts::SinglePassIterator<Iterator>)); |
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utility::iterator_traits<Iterator> traits; |
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while (first!=last) { |
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h.add(traits.data(first), traits.weight(first)); |
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++first; |
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} |
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} |
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|
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/** |
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The Smoother output operator |
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|
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\relates Smoother |
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*/ |
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std::ostream& operator<<(std::ostream& s,const Smoother&); |
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}}} // of namespace statistics, yat, and theplu |
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|
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#endif |