// 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 r=%r_e(varargin)
    // %r_e(i,j,f) extraction f(i,j) in a rational matrix
    //author Serge Steer, INRIA
    //!
    f=varargin($)
    num=f.num
    den=f.den
    r=rlist(num(varargin(1:$-1)),den(varargin(1:$-1)),f.dt)
    if r.num==[] then r=[],end
endfunction