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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 [a,b,c]=minreal(a,b,c,domaine,tol)
//
[lhs,rhs]=argn(0)
select typeof(a)
case "state-space" then
if lhs<>1 then
error(msprintf(gettext("%s: Wrong number of output arguments: %d expected.\n"),"minreal",1)),
end;
select rhs
case 1 then
istol = %f;
case 2 then
istol = %t,
tol = b,
else
error(msprintf(gettext("%s: Wrong number of input arguments: %d or %d expected.\n"),"minreal",1,2)),
end;
[a,b,c,d,x0,dom] = a(2:7);
if dom == [] then
error(96,1);
end
domaine="c";
if dom<>"c" then
domaine="d";
end
case "constant" then
if lhs<>3 then
error(msprintf(gettext("%s: Wrong number of output arguments: %d expected.\n"),"minreal",3)),
end;
select rhs
case 4 then istol = %f
case 5 then istol = %t,
else
error(msprintf(gettext("%s: Wrong number of input arguments: %d or %d expected.\n"),"minreal",4,5));
end;
else
error(91,1);
end;
//
wc = lyap(a', -b*b', domaine);
wo = lyap(a, -c'*c, domaine);
if ~istol then
[r,n] = equil1(wc,wo);
else
[r,n] = equil1(wc,wo,tol);
end;
n1 = n(1);
ri = inv(r);
r = r(1:n1,:);
ri = ri(:,1:n1);
a = r*a*ri;
b = r*b;
c = c*ri;
if lhs == 1 then
a = syslin(dom,a,b,c,d,r*x0);
end
endfunction
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