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/* statistics.h: find the first and second moments.
Copyright (C) 1992 Free Software Foundation, Inc.
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 2, 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., 675 Mass Ave, Cambridge, MA 02139, USA. */
#ifndef STATISTICS_H
#define STATISTICS_H
#include "types.h"
typedef struct
{
real mean;
real variance;
} statistics_type;
/* Compute the statistics on A. */
extern statistics_type statistics (real *a, unsigned length,
unsigned pertinent);
/* Return the mean of the array A, assumed to have length LENGTH -- but
only PERTINENT of the entries really count. */
extern real mean (real *a, unsigned length, unsigned pertinent);
/* Similarly, for the standard deviation. */
extern real standard_deviation (real *, real mean, unsigned length,
unsigned pertinent);
#endif /* not STATISTICS_H */
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