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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2015 Blender Foundation. All rights reserved. */
#pragma once
/** \file
* \ingroup bli
*/
#include "BLI_compiler_attrs.h"
#include "BLI_math_inline.h"
#ifdef __cplusplus
extern "C" {
#endif
#ifdef BLI_MATH_GCC_WARN_PRAGMA
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wredundant-decls"
#endif
/* -------------------------------------------------------------------- */
/** \name Covariance Matrices
* \{ */
/**
* \brief Compute the covariance matrix of given set of nD coordinates.
*
* \param n: the dimension of the vectors (and hence, of the covariance matrix to compute).
* \param cos_vn: the nD points to compute covariance from.
* \param nbr_cos_vn: the number of nD coordinates in cos_vn.
* \param center: the center (or mean point) of cos_vn. If NULL,
* it is assumed cos_vn is already centered.
* \param use_sample_correction: whether to apply sample correction
* (i.e. get 'sample variance' instead of 'population variance').
* \return r_covmat the computed covariance matrix.
*/
void BLI_covariance_m_vn_ex(int n,
const float *cos_vn,
int nbr_cos_vn,
const float *center,
bool use_sample_correction,
float *r_covmat);
/**
* \brief Compute the covariance matrix of given set of 3D coordinates.
*
* \param cos_v3: the 3D points to compute covariance from.
* \param nbr_cos_v3: the number of 3D coordinates in cos_v3.
* \return r_covmat the computed covariance matrix.
* \return r_center the computed center (mean) of 3D points (may be NULL).
*/
void BLI_covariance_m3_v3n(const float (*cos_v3)[3],
int nbr_cos_v3,
bool use_sample_correction,
float r_covmat[3][3],
float r_center[3]);
#ifdef BLI_MATH_GCC_WARN_PRAGMA
# pragma GCC diagnostic pop
#endif
/** \} */
#ifdef __cplusplus
}
#endif
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