copy from scripts/signal/autocor.m
copy to scripts/deprecated/autocor.m
--- a/scripts/signal/autocor.m
+++ b/scripts/deprecated/autocor.m
@@ -23,13 +23,25 @@
 ## If @var{h} is omitted, all autocorrelations are computed.
 ## If @var{x} is a matrix, the autocorrelations of each column are
 ## computed.
+## The particular algorithm used is from the field of statistics and 
+## differs from the definition used in signal processing.
 ## @end deftypefn
 
 ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at>
 ## Description: Compute autocorrelations
 
+## Deprecated in version 3.4
+
 function retval = autocor (X, h)
 
+  persistent warned = false;
+  if (! warned)
+    warned = true;
+    warning ("Octave:deprecated-function",
+             "autocor is obsolete and will be removed from a future version of Octave; See the Octave-Forge signal package and the function xcor for a replacement");
+  endif
+
+
   if (nargin == 1)
     retval = autocov (X);
   elseif (nargin == 2)