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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 [nk,W]=hankelsv(sl,tol)
//!
if typeof(sl)<>"state-space" then
error(msprintf(gettext("%s: Wrong type for input argument #%d: State-space linear system expected.\n"),"hankelsv",1)),
end
if sl.dt==[] then
warning(msprintf(gettext("%s: Input argument %d is assumed continuous time.\n"),"hankelsv",1));
sl.dt="c"
elseif sl.dt<>"c" then
error(msprintf(gettext("%s: Wrong type for input argument #%d: Continuous-time linear system expected.\n"),"hankelsv",1)),
end
//
[lhs,rhs]=argn(0),
if rhs==1 then tol=1000*%eps,end,
lf=spec(sl(2)),
if min(abs(lf))<=tol then
error(msprintf(gettext("%s: Wrong value for input argument #%d: Pure imaginary poles unexpected.\n"),"hankelsv",1)),
end
if max(real(lf)) > tol then
error(msprintf(gettext("%s: Wrong value for input argument #%d: Stable system expected.\n"),"hankelsv",1)),
end,
[sla,sls,d]=dtsi(sl);
lc=ctr_gram(sls),lo=obs_gram(sls),W=lc*lo;
nk=gsort(real(spec(W)));
endfunction
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