65 lines
1.9 KiB
C++
65 lines
1.9 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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
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* GNU 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 this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is:
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* GXML/Graphite: Geometry and Graphics Programming Library + Utilities
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* Copyright (C) 2000 Bruno Levy
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* Contact: Bruno Levy
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* <levy@loria.fr>
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* ISA Project
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* LORIA, INRIA Lorraine,
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* Campus Scientifique, BP 239
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* 54506 VANDOEUVRE LES NANCY CEDEX
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* FRANCE
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*/
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#pragma once
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/** \file
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* \ingroup freestyle
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*/
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#include "../system/FreestyleConfig.h"
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namespace Freestyle {
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namespace OGF {
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namespace MatrixUtil {
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/**
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* computes the eigen values and eigen vectors of a semi definite symmetric matrix
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*
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* \param mat: The matrix stored in column symmetric storage, i.e.
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* <pre>
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* matrix = { m11, m12, m22, m13, m23, m33, m14, m24, m34, m44 ... }
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* size = n(n+1)/2
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* </pre>
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*
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* \param eigen_vec: (return) = { v1, v2, v3, ..., vn }
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* where `vk = vk0, vk1, ..., vkn`
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* `size = n^2`, must be allocated by caller.
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*
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* \param eigen_val: (return) are in decreasing order
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* `size = n`, must be allocated by caller.
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*/
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void semi_definite_symmetric_eigen(const double *mat, int n, double *eigen_vec, double *eigen_val);
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} // namespace MatrixUtil
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} // namespace OGF
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} /* namespace Freestyle */
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