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;
+}