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## Copyright (C) 1996, 1998, 2000, 2003, 2004, 2005, 2006, 2007
## Auburn University. All rights reserved.
##
##
## This program is free software; you can redistribute it and/or modify it
## under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or (at
## your option) any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {[@var{zer}, @var{pol}, @var{k}] =} tf2zp (@var{num}, @var{den})
## Converts transfer functions to poles-and-zero representations.
##
## Returns the zeros and poles of the @acronym{SISO} system defined
## by @var{num}/@var{den}.
## @var{k} is a gain associated with the system zeros.
## @end deftypefn
## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu>
function [zer, pol, k] = tf2zp (num, den)
if (nargin == 2)
if (length (den) > 1)
pol = roots (den);
else
pol = [];
endif
if (length (num) > 1)
zer = roots (num);
else
zer = [];
endif
else
print_usage ();
endif
k = num(1) / den(1);
endfunction
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