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/* SPDX-License-Identifier: GPL-2.0-or-later
* The Original Code is:
* GXML/Graphite: Geometry and Graphics Programming Library + Utilities
* Copyright 2000 Bruno Levy <levy@loria.fr> */
#pragma once
/** \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.
* <pre>
* matrix = { m11, m12, m22, m13, m23, m33, m14, m24, m34, m44 ... }
* size = n(n+1)/2
* </pre>
*
* \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);
} // namespace MatrixUtil
} // namespace OGF
} /* namespace Freestyle */
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