Mercurial > octave-nkf
view scripts/polynomial/ppder.m @ 13741:b0e70a71647b stable release-3-4-3
Version 3.4.3 released.
* configure.ac (AC_INIT): Version number is now 3.4.3.
(OCTAVE_RELEASE_DATE): Update to 2011-10-10.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Mon, 10 Oct 2011 10:23:45 -0400 |
parents | d0b799dafede |
children | 59e2460acae1 |
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## Copyright (C) 2008-2011 VZLU Prague, a.s., Czech Republic ## ## 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. ## ## This program 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 this software; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Function File} {@var{ppd} =} ppder (@var{pp}) ## Compute the piecewise derivative of the piecewise polynomial struct @var{pp}. ## @seealso{mkpp, ppval, ppint} ## @end deftypefn function ppd = ppder (pp) if (nargin != 1) print_usage (); endif if (! isstruct (pp)) error ("ppder: PP must be a structure"); endif [x, p, n, k, d] = unmkpp (pp); p = reshape (p, [], k); if (k <= 1) pd = zeros (rows (p), 1); k = 1; else k -= 1; pd = p(:,1:k) * diag (k:-1:1); endif ppd = mkpp (x, pd, d); endfunction