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## Copyright (C) 1993, 2000, 2004, 2005, 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{zr} =} tzero2 (@var{a}, @var{b}, @var{c}, @var{d}, @var{bal})
## Compute the transmission zeros of @var{a}, @var{b}, @var{c}, @var{d}.
##
## @var{bal} = balancing option (see balance); default is @code{"B"}.
##
## Needs to incorporate @command{mvzero} algorithm to isolate finite zeros;
## use @command{tzero} instead.
## @end deftypefn
## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu>
## Created: August 1993
function zr = tzero2 (a, b, c, d, bal)
if (nargin == 4)
bal = "B";
elseif (nargin != 5)
error ("tzero: invalid number of arguments");
endif
[n, m, p] = abcddim (a, b, c, d);
if (n > 0 && m > 0 && p > 0)
if (m != p)
fprintf (stderr, "tzero: number of inputs,outputs differ. squaring up");
if (p > m)
fprintf (stderr, " by padding b and d with zeros.");
b = [b, (zeros (n, p-m))];
d = [d, (zeros (p, p-m))];
m = p;
else
fprintf (stderr, " by padding c and d with zeros.");
c = [c; (zeros (m-p, n))];
d = [d; (zeros (m-p, m))];
p = m;
endif
fprintf (stderr, "This is a kludge. Try again with SISO system.");
endif
ab = [-a, -b; c, d];
bb = [(eye (n)), (zeros (n, m)); (zeros (p, n)), (zeros (p, m))];
[ab,bb] = balance (ab, bb);
zr = -qz (ab, bb);
else
error ("tzero: a, b, c, d not compatible. exiting");
endif
endfunction
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