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diff --git a/modules/cacsd/macros/sysdiag.sci b/modules/cacsd/macros/sysdiag.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 r=sysdiag(varargin)
+    //Returns the block-diagonal system made with subsystems put in the main
+    //diagonal
+    // Syntax:
+    // r=sysdiag(a1,a2,...,an)
+    //
+    // ai    : subsystems (i.e. gains, or linear systems in state-space or
+    //                     transfer form)
+    //Remark:
+    //  At most 17 arguments...
+    //Example
+    // s=poly(0,'s')
+    // sysdiag(rand(2,2),1/(s+1),[1/(s-1);1/((s-2)*(s-3))])
+    // sysdiag(tf2ss(1/s),1/(s+1),[1/(s-1);1/((s-2)*(s-3))])
+
+
+    //!
+    r=varargin(1);
+    [m1,n1]=size(r);
+    for k=2:size(varargin)
+        ak=varargin(k)
+        [mk,nk]=size(ak);
+        r=[r,0*ones(m1,nk);0*ones(mk,n1),ak]
+        m1=m1+mk
+        n1=n1+nk
+    end
+endfunction