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diff --git a/modules/cacsd/macros/abcd.sci b/modules/cacsd/macros/abcd.sci
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+++ b/modules/cacsd/macros/abcd.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 [A,B,C,D]=abcd(sl)
+    // Retrieves [A,B,C,D] matrices from linear system sl
+
+    select typeof(sl)
+    case "state-space" then
+        [A,B,C,D]=sl(2:5)
+        return;
+    case "rational" then
+        w=tf2ss(sl);
+        [A,B,C,D]=w(2:5)
+    else
+        error(msprintf(_("%s: Wrong type for input argument: Linear dynamical system expected.\n"),"abcd"))
+    end
+endfunction