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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 [gc]=ctr_gram(a,b,domaine)
//!
[lhs,rhs]=argn(0)
select typeof(a)
case "constant" then
if rhs<2 then error(39); end;
if rhs==2 then
domaine="c";
else
if and(domaine<>["d","c"]) then
error(msprintf(gettext("%s: Wrong value for input argument #%d: Must be in the set {%s}.\n"), "ctr_gram",3,"''d'', ''c''"));
end
end;
[m,n]=size(a)
if m<>n then error(20,1),end
[mb,nb]=size(b);if mb<>n then error(60),end
case "state-space" then
if rhs>1 then
error(msprintf(gettext("%s: Wrong number of input arguments: %d expected"),"ctr_gram",1)),
end
[a,b,domaine]=a([2,3,7])
if domaine==[] then
warning(msprintf(gettext("%s: Input argument %d is assumed continuous time.\n"),"ctr_gram",1));
domaine="c";
elseif type(domaine)==1 then
domaine="d",
end
[n,n]=size(a)
case "rational" then
if rhs>1 then
error(msprintf(gettext("%s: Wrong number of input arguments: %d expected"),"ctr_gram",1)),
end
a=tf2ss(a)
[a,b,domaine]=a([2,3,7])
if domaine==[] then
warning(msprintf(gettext("%s: Input argument %d is assumed continuous time.\n"),"ctr_gram",1));
domaine="c";
elseif type(domaine)==1 then
domaine="d",
end
[n,n]=size(a)
else
if rhs==1 then
error(msprintf(gettext("%s: Wrong type for input argument #%d: Linear dynamical system expected.\n"),"ctr_gram",1))
else
error(msprintf(gettext("%s: Wrong type of input argument #%d: Array of floating point numbers expected.\n"),"ctr_gram",1))
end
end
s=spec(a)
if (domaine=="c"&max(real(s))>=0)|(domaine=="d"&max(abs(s))>=1) then
error(msprintf(gettext("%s: Wrong value for input argument #%d: Stable system expected.\n"),"ctr_gram",1));
end
gc=lyap(a',-b*b',domaine)
endfunction
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