68 lines
2.0 KiB
C
68 lines
2.0 KiB
C
/* SPDX-FileCopyrightText: 2015 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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/** \file
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* \ingroup bli
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*/
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#include "BLI_compiler_attrs.h"
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#include "BLI_math_inline.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifdef BLI_MATH_GCC_WARN_PRAGMA
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# pragma GCC diagnostic push
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# pragma GCC diagnostic ignored "-Wredundant-decls"
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#endif
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/* -------------------------------------------------------------------- */
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/** \name Covariance Matrices
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* \{ */
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/**
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* \brief Compute the covariance matrix of given set of nD coordinates.
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*
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* \param n: the dimension of the vectors (and hence, of the covariance matrix to compute).
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* \param cos_vn: the nD points to compute covariance from.
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* \param cos_vn_num: the number of nD coordinates in cos_vn.
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* \param center: the center (or mean point) of cos_vn. If NULL,
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* it is assumed cos_vn is already centered.
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* \param use_sample_correction: whether to apply sample correction
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* (i.e. get 'sample variance' instead of 'population variance').
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* \return r_covmat the computed covariance matrix.
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*/
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void BLI_covariance_m_vn_ex(int n,
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const float *cos_vn,
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int cos_vn_num,
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const float *center,
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bool use_sample_correction,
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float *r_covmat);
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/**
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* \brief Compute the covariance matrix of given set of 3D coordinates.
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*
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* \param cos_v3: the 3D points to compute covariance from.
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* \param cos_v3_num: the number of 3D coordinates in cos_v3.
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* \return r_covmat the computed covariance matrix.
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* \return r_center the computed center (mean) of 3D points (may be NULL).
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*/
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void BLI_covariance_m3_v3n(const float (*cos_v3)[3],
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int cos_v3_num,
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bool use_sample_correction,
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float r_covmat[3][3],
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float r_center[3]);
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#ifdef BLI_MATH_GCC_WARN_PRAGMA
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# pragma GCC diagnostic pop
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#endif
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/** \} */
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#ifdef __cplusplus
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}
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#endif
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