--- polyval.m.orig	2010-11-23 16:04:32.000000000 +0100
+++ polyval.m	2010-11-23 16:04:35.000000000 +0100
@@ -59,7 +59,7 @@
   endif
 
   if (isempty (x))
-    y = [];
+    y = x;
     return;
   endif