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diff --git a/modules/cacsd/macros/acf.sci b/modules/cacsd/macros/acf.sci
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+// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
+// Copyright (C) INRIA -
+//
+// This file must be used under the terms of the CeCILL.
+// This source file is licensed as described in the file COPYING, which
+// you should have received as part of this distribution.  The terms
+// are also available at
+// http://www.cecill.info/licences/Licence_CeCILL_V2.1-en.txt
+
+function [ac,Mean]=acf(x,n,minim,maxim)
+    //function acp(x,n,[minim,maxim])
+    // Autocorrelation for one-deimensional process
+
+    [lhs,rhs]=argn(0)
+    if rhs <= 1 ; n=prod(size(x))/4;end
+    if rhs <= 2 ; minim=-1.0;end
+    if rhs <= 3 ; maxim= 1.0;end
+    [cov,Mean]=corr(x,n+1);
+    ac=cov'/cov(1);
+    plot2d3("onn",(0:n)',ac,[1],"011"," ",[0,minim,n,maxim]);
+    //stde=sqrt((1+2*ac(2:n+1)'*ac(2:n+1))*1/prod(size(x)))
+    stde=2*sqrt(1/prod(size(x)));
+    plot2d( [0,0,0;n,n,n],[0,stde,-stde;0,stde,-stde],[1,2,2],"000")
+    xtitle(gettext("Autocorrelation Function"));
+endfunction