1 files changed, 45 insertions, 0 deletions
diff --git a/gsl-1.9/statistics/quantiles_source.c b/gsl-1.9/statistics/quantiles_source.c
new file mode 100644
index 0000000..393469d
--- /dev/null
+++ b/gsl-1.9/statistics/quantiles_source.c
@@ -0,0 +1,45 @@
+/* statistics/quantiles_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,quantile_from_sorted_data) (const BASE sorted_data[], 
+                                               const size_t stride,
+                                               const size_t n,
+                                               const double f)
+{
+  const double index = f * (n - 1) ;
+  const size_t lhs = (int)index ;
+  const double delta = index - lhs ;
+  double result;
+
+  if (n == 0)
+    return 0.0 ;
+
+  if (lhs == n - 1)
+    {
+      result = sorted_data[lhs * stride] ;
+    }
+  else 
+    {
+      result = (1 - delta) * sorted_data[lhs * stride] + delta * sorted_data[(lhs + 1) * stride] ;
+    }
+
+  return result ;
+}