expressions: Implement the MEDIAN function.

[pspp] / src / language / expressions / helpers.h

diff --git a/src/language/expressions/helpers.h b/src/language/expressions/helpers.h
index 51e1db0329a1bf3d8cd7c83f72e3023aadf5b6a1..c4e332340625f17d9f52962b743eaa00c11efb9e 100644 (file)
--- a/src/language/expressions/helpers.h
+++ b/src/language/expressions/helpers.h
@@ -89,4 +89,6 @@ struct substring replace_string (struct expression *,
                                  struct substring replacement,
                                  double n);
 
+double median (double *, size_t n);
+
 #endif /* expressions/helpers.h */