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+## Copyright (C) 1996 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} {} tfout (@var{num}, @var{denom}@{, @var{x}@})
+## Print formatted transfer function @math{n(s)/d(s) } to the screen.
+## @var{x} defaults to the string @code{"s"}
+## @end deftypefn
+## @seealso{polyval, polyvalm, poly, roots, conv, deconv, residue,
+## filter, polyderiv, polyinteg, and polyout}
+
+## Author: A. S. Hodel <a.s.hodel@eng.auburn.edu>
+## Created: June 1995
+
+function tfout (num, denom, x)
+
+  save_empty = empty_list_elements_ok;
+  empty_list_elements_ok = 1;
+
+  if (nargin < 2 ) | (nargin > 3) | (nargout != 0 )
+    usage("tfout(num,denom[,x])");
+  endif
+
+  if ( (!is_vector(num)) | (!is_vector(denom)) )
+    error("tfout: first two argument must be vectors");
+  endif
+
+  if (nargin == 2)
+    x = "s";
+  elseif( ! isstr(x) )
+    error("tfout: third argument must be a string");
+  endif
+
+  numstring = polyout(num,x);
+  denomstring = polyout(denom,x);
+  len = max(length(numstring),length(denomstring));
+  if(len > 0)
+    y = strrep(blanks(len)," ","-");
+    disp(numstring)
+    disp(y)
+    disp(denomstring)
+  else
+    error ("tfout: empty transfer function")
+  end
+
+  empty_list_elements_ok = save_empty;
+endfunction