calc-vec.el (math-vector-avg): Put the vector elements in order

before computing the averages.

2 files changed, 6 insertions, 1 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 23338834d63..f6d4ce0c884 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2010-05-17  Jay Belanger  <jay.p.belanger@gmail.com>
+
+        * calc/calc-vec.el (math-vector-avg):  Put the vector elements in
+        order before computing the averages.
+
 2010-05-16  Jay Belanger  <jay.p.belanger@gmail.com>
 
         * calc/calc-vec.el (calc-histogram):
diff --git a/lisp/calc/calc-vec.el b/lisp/calc/calc-vec.el
index 5f426942e2f..5b807a55491 100644
--- a/lisp/calc/calc-vec.el
+++ b/lisp/calc/calc-vec.el
@@ -1178,7 +1178,7 @@
 ;;; Replace a vector [a b c ...] with a vector of averages
 ;;; [(a+b)/2 (b+c)/2 ...]
 (defun math-vector-avg (vec)
-  (let ((vp (cdr vec))
+  (let ((vp (sort (copy-sequence (cdr vec)) 'math-beforep))
         (res nil))
     (while (and vp (cdr vp))
       (setq res (cons (math-div (math-add (car vp) (cadr vp)) 2) res)