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- /* statistics/mean_source.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007 Jim Davies, Brian Gough
- *
- * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
- double
- FUNCTION (gsl_stats, mean) (const BASE data[], const size_t stride, const size_t size)
- {
- /* Compute the arithmetic mean of a dataset using the recurrence relation
- mean_(n) = mean(n-1) + (data[n] - mean(n-1))/(n+1) */
- long double mean = 0;
- size_t i;
- for (i = 0; i < size; i++)
- {
- mean += (data[i * stride] - mean) / (i + 1);
- }
- return mean;
- }
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