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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 des=sm2des(sysmat,n)
// Generalized system-matrix to descriptor
// sysmat=[-s E + A , B; C , D]
// des=list('des',A,B,C,D,E)
// n=size(A) (assumed square) (optional parameter)
[LHS,RHS]=argn(0)
[nl,nc]=size(sysmat);
E=-coeff(sysmat,1);
if RHS==1 then
k=nc;n=k;
while E(:,k)==0*E(:,k)
k=k-1;n=k;
end
l=nl;n1=l;
while E(l,:)==0*E(l,:)
l=l-1;n1=l;
end
if n1<>n then
warning(msprintf(gettext("%s: Cannot find the state dimension.\n"),"sm2des"));
end
end
E=E(1:n,1:n);
A=coeff(sysmat(1:n,1:n),0);
B=coeff(sysmat(1:n,n+1:nc),0);
C=coeff(sysmat(n+1:nl,1:n),0);
D=coeff(sysmat(n+1:nl,n+1:nc),0);
des=tlist(["des","A","B","C","D","E"],A,B,C,D,E);
endfunction
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