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- ## Copyright (C) 1993 Auburn University. All Rights Reserved
- ##
- ## This file is part of Octave.
- ##
- ## Octave 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 2, or (at your option) any
- ## later version.
- ##
- ## Octave 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 Octave; see the file COPYING. If not, write to the Free
- ## Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA.
-
- ## -*- texinfo -*-
- ##@deftypefn {Function File } { @var{zr} =} tzero2 (@var{a}, @var{b}, @var{c}, @var{d}, @var{bal})
- ##Compute the transmission zeros of a, b, c, d.
- ##
- ##bal = balancing option (see balance); default is "B".
- ##
- ##Needs to incorporate @code{mvzero} algorithm to isolate finite zeros; use
- ##@code{tzero} instead.
- ##@end deftypefn
-
- function zr = tzero2 (a, b, c, d, bal)
- ## Written by A. S. Hodel (scotte@eng.auburn.edu) August 1993.
-
- if (nargin == 4)
- bal = "B";
- elseif (nargin != 5)
- error ("tzero: illegal 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
-