/* statistics/mean_source.c * * Copyright (C) 1996, 1997, 1998, 1999, 2000 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 2 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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