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LibrePilot/flight/libraries/math/mathmisc.c
2016-07-03 16:51:36 +02:00

46 lines
1.6 KiB
C

/**
******************************************************************************
* @addtogroup OpenPilot Math Utilities
* @{
* @addtogroup Reuseable math functions
* @{
*
* @file mathmisc.c
* @author The LibrePilot Project, http://www.librepilot.org Copyright (C) 2016.
* The OpenPilot Team, http://www.openpilot.org Copyright (C) 2012.
* @brief Reuseable math functions
*
* @see The GNU Public License (GPL) Version 3
*
*****************************************************************************/
/*
* 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 3 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <mathmisc.h>
void pseudo_windowed_variance_init(pw_variance_t *variance, int32_t window_size)
{
variance->new_sma = 0.0f;
variance->new_smsa = 0.0f;
variance->p1 = 1.0f / (float)window_size;
variance->p2 = 1.0f - variance->p1;
}
float pseudo_windowed_variance_get(pw_variance_t *variance)
{
return variance->new_smsa - variance->new_sma * variance->new_sma;
}