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Diffstat (limited to 'gsl-1.9/statistics/mean_source.c')
-rw-r--r-- | gsl-1.9/statistics/mean_source.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/gsl-1.9/statistics/mean_source.c b/gsl-1.9/statistics/mean_source.c new file mode 100644 index 0000000..235d7bd --- /dev/null +++ b/gsl-1.9/statistics/mean_source.c @@ -0,0 +1,35 @@ +/* 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; +} |