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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 S=ss2des(Sl,flag)
// Returns S=list('des',A,B,C,D,E) for Sl a state-space
// system with Ds polynomial.
// if flag=="withD" a maximal rank D matrix is returned in S
// otherwise D=0;
// Copyright INRIA
[LHS,RHS]=argn(0);
if RHS==1 then flag=[];end
if RHS==2&flag<>"withD" then warning(msprintf(gettext("%s: Wrong value for input argument #%d: ''%s'' expected.\n"),"ss2des",2,"withD"));end
Ds=Sl(5);
if type(Ds)==1 then
if norm(Ds,1)==0 then S=Sl;return;end
if norm(Ds,1)<>0 then Sl(5)=Ds+poly(0,"s")*0*Ds;end
end
[A2,B2,C2,Ds]=Sl(2:5);
if flag=="withD" then D=coeff(Ds,0);Ds=Ds-D;end
[N,B1,C1]=pol2des(Ds);
[n1,n1]=size(N);
[n2,n2]=size(A2);
E=[N,0*ones(n1,n2);0*ones(n2,n1),eye(n2,n2)];
A=[eye(N),0*ones(n1,n2);0*ones(n2,n1),A2];
C=[C1,C2];
B=[B1;B2];
if flag<>"withD" then D=0*C*B;end
S=tlist(["des","A","B","C","D","E"],A,B,C,D,E);
endfunction
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