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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 */
-