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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is:
* GXML/Graphite: Geometry and Graphics Programming Library + Utilities
* Copyright (C) 2000 Bruno Levy
* Contact: Bruno Levy
* levy@loria.fr
* ISA Project
* LORIA, INRIA Lorraine,
* Campus Scientifique, BP 239
* 54506 VANDOEUVRE LES NANCY CEDEX
* FRANCE
*/
#ifndef __MATRIX_UTIL__
#define __MATRIX_UTIL__
/** \file \ingroup freestyle
*/
#include "../system/FreestyleConfig.h"
namespace Freestyle {
namespace OGF {
namespace MatrixUtil {
/**
* computes the eigen values and eigen vectors of a semi definite symmetric matrix
*
* \param mat: The matrix stored in column symmetric storage, i.e.
* matrix = { m11, m12, m22, m13, m23, m33, m14, m24, m34, m44 ... }
* size = n(n+1)/2
*
* \param eigen_vec: (return) = { v1, v2, v3, ..., vn }
* where vk = vk0, vk1, ..., vkn
* size = n^2, must be allocated by caller
*
* \param eigen_val: (return) are in decreasing order
* size = n, must be allocated by caller
*/
void semi_definite_symmetric_eigen(const double *mat, int n, double *eigen_vec, double *eigen_val);
} // MatrixUtil namespace
} // OGF namespace
} /* namespace Freestyle */
#endif // __MATRIX_UTIL__
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