// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) ENPC - JPC
// Copyright (C) INRIA - Serge Steer , Francois Delebecque
//
// 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   [den,num,err]=arl2(y,den0,n,imp,all)
    [lhs,rhs]=argn(0);
    // test the system type 'c' 'd' or dt
    if rhs <= 4 then all="one";end
    if rhs <= 3 then imp=0;end
    if all=="all" then
        [den,num,err]=arl2_ius(y,den0,n,imp,all);
    else
        [den,num,err]=arl2_ius(y,den0,n,imp);
    end;
    if lhs<=1 then
        den=syslin("d",num,den);
    end
endfunction