Mercurial > octave-nkf
view scripts/polynomial/polyreduce.m @ 18479:85d31344fb23 stable rc-3-8-1-2
3.8.1 release candidate 2
* configure.ac (OCTAVE_VERSION): Bump to 3.8.1-rc2.
(OCTAVE_MINOR_VERSION): Bump to 1-rc2.
(OCTAVE_RELEASE_DATE): Set to 2014-02-14.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 17 Feb 2014 02:20:39 -0500 |
parents | d63878346099 |
children | 4197fc428c7d |
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## Copyright (C) 1994-2013 John W. Eaton ## ## 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 3 of the License, 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, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {} polyreduce (@var{c}) ## Reduce a polynomial coefficient vector to a minimum number of terms by ## stripping off any leading zeros. ## @seealso{polyout} ## @end deftypefn ## Author: Tony Richardson <arichard@stark.cc.oh.us> ## Created: June 1994 ## Adapted-By: jwe function p = polyreduce (c) if (nargin != 1) print_usage (); elseif (! isvector (c) || isempty (c)) error ("polyreduce: C must be a non-empty vector"); endif idx = find (c != 0, 1); if (isempty (idx)) p = 0; else p = c(idx:end); endif endfunction %!assert (polyreduce ([0, 0, 1, 2, 3]), [1, 2, 3]) %!assert (polyreduce ([1, 2, 3, 0, 0]), [1, 2, 3, 0, 0]) %!assert (polyreduce ([1, 0, 3]), [1, 0, 3]) %!assert (polyreduce ([0, 0, 0]), 0) %!error polyreduce () %!error polyreduce (1, 2) %!error <C must be a non-empty vector> polyreduce ([1, 2; 3, 4]) %!error <C must be a non-empty vector> polyreduce ([])