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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 [n,m,x,y,nt,mt,xt,yt]=dcf(g,polf,polc,tol)
//[n,m,x,y,nt,mt,xt,yt]=dcf(g,[polf,polc,[tol]]) returns eight
//stable systems (n,m,x,y,nt,mt,xt,yt) for the doubly coprime factorization
//
// !xt -yt! ! m y !
// ! !*! ! = eye
// !-nt mt! ! n x !
// G must be stabilizable and detectable.
// See copfac for a description of parameters.
//!
[lhs,rhs]=argn(0),
n1=contr(g(2),g(3)),n2=contr(g(2)',g(4)'),
select rhs,
case 1 then
polc=-ones(1,n1),polf=-ones(1,n2),tol=1000*%eps,
case 2 then
tol=polf,polc=-ones(1,n1),polf=-ones(1,n2),
case 3 then tol=1000*%eps,
end,
[n,m,xt,yt]=copfac(g,polf,polc,tol),
[nt,mt,x,y]=copfac(g',polc,polf,tol),
nt=nt',mt=mt',x=x',y=y',
endfunction
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