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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) ????-2008 - 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 [N,B,C]=pol2des(Ds)
// Given the polynomial matrix Ds= D_0 +D_1 s +D_2 s^2 + ... +D_k s^k,
// pol2des returns three matrices N,B,C (with N nilpotent) such that
// Ds = C (sN-Eye)^-1 B
//!
if type(Ds)==1 then Ds=Ds+0*poly(0,"s")*Ds;end
dg=max(degree(Ds))+1;
[nout,nin]=size(Ds);
[Sl]=markp2ss(coeff(Ds),dg,nout,nin);
N=Sl(2);B=-Sl(3);C=Sl(4)
endfunction
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