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46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/**
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******************************************************************************
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* @addtogroup OpenPilot Math Utilities
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* @{
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* @addtogroup Reuseable math functions
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* @{
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*
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* @file mathmisc.c
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* @author The LibrePilot Project, http://www.librepilot.org Copyright (C) 2016.
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* The OpenPilot Team, http://www.openpilot.org Copyright (C) 2012.
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* @brief Reuseable math functions
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*
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* @see The GNU Public License (GPL) Version 3
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*
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*****************************************************************************/
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (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, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <mathmisc.h>
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void pseudo_windowed_variance_init(pw_variance_t *variance, int32_t window_size)
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{
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variance->new_sma = 0.0f;
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variance->new_smsa = 0.0f;
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variance->p1 = 1.0f / (float)window_size;
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variance->p2 = 1.0f - variance->p1;
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}
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float pseudo_windowed_variance_get(pw_variance_t *variance)
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{
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return variance->new_smsa - variance->new_sma * variance->new_sma;
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}
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