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tfout.m
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1999-12-24
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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
## See also: polyval, polyvalm, poly, roots, conv, deconv, residue,
## filter, polyderv, polyintg, 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_vec(num)) | (!is_vec(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