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authorShashank2017-05-29 12:40:26 +0530
committerShashank2017-05-29 12:40:26 +0530
commit0345245e860375a32c9a437c4a9d9cae807134e9 (patch)
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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