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## Copyright (C) 1996, 2000, 2002, 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} {} zpout (@var{zer}, @var{pol}, @var{k}, @var{x})
## print formatted zero-pole form to the screen.
## @var{x} defaults to the string @code{"s"}
## @seealso{polyval, polyvalm, poly, roots, conv, deconv, residue, filter, polyderiv, polyinteg, polyout}
## @end deftypefn
## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu>
## Created: June 1995
function zpout (zer, pol, k, x)
if (nargin < 3 || nargin > 4)
print_usage ();
endif
if (! (isvector (zer) || isempty (zer))
|| ! (isvector (pol) || isempty(pol)))
error ("zer, pol must be vectors or empty");
endif
if (! isscalar(k))
error("zpout: argument k must be a scalar.")
endif
if (nargin == 3)
x = "s";
elseif (! ischar (x))
error ("zpout: third argument must be a string");
endif
numstring = num2str (k);
if (length (zer))
## find roots at z,s = 0
nzr = sum (zer == 0);
if (nzr)
if (nzr > 1)
numstring = sprintf ("%s %s^%d", numstring, x, nzr);
else
numstring = cstrcat (numstring, x);
endif
endif
zer = sortcom (-zer);
for ii = 1:length(zer)
if (zer(ii) != 0)
numstring = sprintf ("%s (%s %s)", numstring, x, com2str (zer(ii), 1));
endif
endfor
endif
if (length (pol))
## find roots at z,s = 0
nzr = sum (pol == 0);
if (nzr)
if (nzr > 1)
denomstring = sprintf("%s^%d", x, nzr);
else
denomstring = sprintf ("%s", x);
endif
else
denomstring = " ";
endif
pol = sortcom (-pol);
for ii = 1:length(pol)
if (pol(ii) != 0)
denomstring = sprintf ("%s (%s %s)", denomstring, x,
com2str (pol(ii), 1));
endif
endfor
endif
len = max (length (numstring), length (denomstring));
if(len > 0)
y = strrep (blanks (len), " ", "-");
disp (numstring)
if (length (denomstring))
disp (y)
disp (denomstring)
endif
else
error ("zpout: empty transfer function")
endif
endfunction
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