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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=sm2ss(sysmat)
// Generalized system-matrix to descriptor
// sysmat=[-s I + A , B; C , D]
// [n,n]=size(A)
if typeof(sysmat)<>"polynomial" then
error(msprintf(gettext("%s: Wrong type for input argument #%d: Polynomial array expected.\n"),"sm2ss",1))
end
[nl,nc]=size(sysmat);
E=-coeff(sysmat,1);
k=nc;
while and(E(:,k)==0*E(:,k))
k=k-1;n=k;
end
l=nl;
while and(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"),"sm2ss"));
end
E=E(1:n,1:n);
if E<>eye(n,n) then
error(msprintf(gettext("%s: Wrong type for input argument #%d: Linear state space system expected.\n"),"sm2ss",1));
end
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=syslin([],A,B,C,D);
endfunction
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