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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]=obsvss(a,b,c,tol)
[lhs,rhs]=argn(0)
select typeof(a)
case "constant" then
if lhs<>3 then
error(msprintf(gettext("%s: Wrong number of output arguments: %d expected.\n"),"obsvss",3)),
end
select rhs
case 3 then
tol = 100*%eps
case 4 then ,
else
error(msprintf(gettext("%s: Wrong number of input arguments: %d or %d expected.\n"),"obsvss",3,4))
end;
case "state-space" then
if lhs<>1 then
error(msprintf(gettext("%s: Wrong number of output arguments: %d expected.\n"),"obsvss",1)),
end
select rhs
case 1 then
tol=100*%eps
case 2 then
tol=b
else
error(msprintf(gettext("%s: Wrong number of input arguments: %d or %d expected.\n"),"obsvss",1,2))
end;
[a,b,c,d,x0,dom]=a(2:7)
else
if rhs==1 then
error(msprintf(gettext("%s: Wrong type for input argument #%d: Linear state space expected.\n"),"obsvss",1))
else
error(msprintf(gettext("%s: Wrong type of input argument #%d: Array of floating point numbers expected.\n"),"obsvss",1))
end
end;
//
[no,u]=contr(a',c',tol)
u=u(:,1:no)
a=u'*a*u;b=u'*b;c=c*u
if lhs==1 then a=syslin(dom,a,b,c,d,u'*x0),end
endfunction
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