Mercurial > octave
view scripts/control/polyout.m @ 3346:8dd4718801fd
[project @ 1999-11-09 18:18:12 by jwe]
author | jwe |
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date | Tue, 09 Nov 1999 18:18:37 +0000 |
parents | f7e4a95916f2 |
children | 69b167451491 |
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# Copyright (C) 1995,1998 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{y} =} polyout ( @var{c}@{, @var{x}@}) ## write formatted polynomial ## @example ## c(x) = c(1) * x^n + ... + c(n) x + c(n+1) ## @end example ## to string @var{y} or to the screen (if @var{y} is omitted) ## @var{x} defaults to the string @code{"s"} ## @end deftypefn ## See also: polyval, polyvalm, poly, roots, conv, deconv, residue, ## filter, polyderiv, polyinteg function y = polyout(c,x) # Written by A. Scottedward Hodel (scotte@eng.auburn.edu) May 1995) # Nov 1998: Correctly handles complex coefficients if (nargin < 1 ) || (nargin > 2) || (nargout < 0 ) || (nargout > 1) usage("[y = ] polyout(c,[x])"); endif if (!is_vector(c)) error("polyout: first argument must be a vector"); endif if (nargin == 1) x = 's'; elseif( ! isstr(x) ) error("polyout: second argument must be a string"); endif n = length(c); if(n > 0) n1 = n+1; if( imag(c(1)) ) tmp = com2str(c(1)) else tmp = num2str(c(1)); endif for ii=2:n if(real(c(ii)) < 0) ns = ' - '; c(ii) = -c(ii); else ns = ' + '; endif if( imag(c(ii)) ) nstr = sprintf("(%s)",com2str(c(ii)) ); else nstr = num2str(c(ii)); endif tmp = sprintf("%s*%s^%d%s%s",tmp,x,n1-ii,ns,nstr); endfor else tmp = " "; endif if(nargout == 0) disp(tmp) else y = tmp; endif endfunction