home *** CD-ROM | disk | FTP | other *** search
- ## 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
-
- ## See also: polyval, polyvalm, poly, roots, conv, deconv, residue,
- ## filter, polyderiv, polyinteg, polyout
-
- function tfout (num, denom, x)
- ## Written by A. Scottedward Hodel (scotte@eng.auburn.edu) June 1995)
-
- 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
-