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 ef4fdadd4d310c2842fbaba74e0cfec2ef335b91..c4e332340625f17d9f52962b743eaa00c11efb9e 100644 (file)
--- a/src/language/expressions/helpers.h
+++ b/src/language/expressions/helpers.h
@@ -81,4 +81,14 @@ double cdf_bvnor (double x0, double x1, double r);
 
 double idf_fdist (double P, double a, double b);
 
+double round_nearest (double x, double mult, double fuzzbits);
+
+struct substring replace_string (struct expression *,
+                                 struct substring haystack,
+                                 struct substring needle,
+                                 struct substring replacement,
+                                 double n);
+
+double median (double *, size_t n);
+
 #endif /* expressions/helpers.h */