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diff --git a/modules/cacsd/macros/des2tf.sci b/modules/cacsd/macros/des2tf.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 [Bfs,Bis,tf]=des2tf(des)
+    //des admits a D matrix.
+
+    [LHS,RHS]=argn(0);
+    if LHS<>1 & LHS<> 3 then
+        error(msprintf(gettext("%s: Wrong number of output arguments: %d or %d expected.\n"), "des2tf",1,3));
+    end
+    [A,B,C,D,E]=des(2:6);
+    [Bfs,Bis,chis]=glever(E,A);
+    if LHS==3 then Bfs=C*Bfs*B; Bis=C*Bis*B+D;tf=chis;return;end
+    if LHS==1 then ww=C*Bfs*B;Bfs=ww/chis-C*Bis*B+D;return;end
+endfunction