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// $Id$ |
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/* |
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Copyright (C) 2006, 2007, 2008 Jari Häkkinen, Peter Johansson |
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Copyright (C) 2012, 2020, 2022, 2023 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 <config.h> |
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#include "MultiDimensionalWeighted.h" |
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#include "yat/statistics/AveragerWeighted.h" |
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#include "yat/utility/Matrix.h" |
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#include "yat/utility/Vector.h" |
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#include <cassert> |
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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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MultiDimensionalWeighted::MultiDimensionalWeighted(void) |
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: chisquare_(0), work_(NULL) |
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{ |
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} |
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|
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MultiDimensionalWeighted::~MultiDimensionalWeighted(void) |
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{ |
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gsl_multifit_linear_free(work_); |
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} |
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|
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|
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double MultiDimensionalWeighted::chisq() const |
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{ |
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return chisquare_; |
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} |
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|
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void MultiDimensionalWeighted::fit(const utility::MatrixBase& x, |
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const utility::VectorBase& y, |
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const utility::VectorBase& w) |
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{ |
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assert(y.size()==w.size()); |
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assert(x.rows()==y.size()); |
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|
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covariance_.resize(x.columns(),x.columns()); |
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fit_parameters_.resize(x.columns()); |
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gsl_multifit_linear_free(work_); |
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if (!(work_=gsl_multifit_linear_alloc(x.rows(),fit_parameters_.size()))) |
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throw utility::GSL_error("MultiDimensionalWeighted::fit failed to allocate memory"); |
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int status = gsl_multifit_wlinear(x.gsl_matrix_p(), w.gsl_vector_p(), |
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y.gsl_vector_p(), |
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fit_parameters_.gsl_vector_p(), |
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covariance_.gsl_matrix_p(), &chisquare_, |
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work_); |
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if (status) |
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throw utility::GSL_error(std::string("MultiDimensionalWeighted::fit", |
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status)); |
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|
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statistics::AveragerWeighted aw; |
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add(aw, y.begin(), y.end(), w.begin()); |
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s2_ = chisquare_ / (aw.n()-fit_parameters_.size()); |
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covariance_ *= s2_; |
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} |
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|
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const utility::Vector& MultiDimensionalWeighted::fit_parameters(void) const |
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{ |
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return fit_parameters_; |
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} |
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double MultiDimensionalWeighted::predict(const utility::VectorBase& x) const |
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{ |
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assert(x.size()==fit_parameters_.size()); |
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return fit_parameters_ * x; |
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} |
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double MultiDimensionalWeighted::prediction_error2(const utility::VectorBase& x, |
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const double w) const |
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{ |
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return standard_error2(x) + s2(w); |
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} |
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|
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|
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double MultiDimensionalWeighted::s2(const double w) const |
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{ |
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return s2_/w; |
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} |
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|
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double |
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MultiDimensionalWeighted::standard_error2(const utility::VectorBase& x) const |
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{ |
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return x * covariance_ * x; |
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} |
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}}} // of namespaces regression, yat, and theplu |