Mercurial > octave-nkf
view scripts/signal/filter2.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> |
---|---|
date | Mon, 17 Feb 2014 02:20:39 -0500 |
parents | d63878346099 |
children | 4197fc428c7d |
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## Copyright (C) 2001-2013 Paul Kienzle ## ## 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} {@var{y} =} filter2 (@var{b}, @var{x}) ## @deftypefnx {Function File} {@var{y} =} filter2 (@var{b}, @var{x}, @var{shape}) ## Apply the 2-D FIR filter @var{b} to @var{x}. If the argument ## @var{shape} is specified, return an array of the desired shape. ## Possible values are: ## ## @table @asis ## @item @qcode{"full"} ## pad @var{x} with zeros on all sides before filtering. ## ## @item @qcode{"same"} ## unpadded @var{x} (default) ## ## @item @qcode{"valid"} ## trim @var{x} after filtering so edge effects are no included. ## @end table ## ## Note this is just a variation on convolution, with the parameters ## reversed and @var{b} rotated 180 degrees. ## @seealso{conv2} ## @end deftypefn ## Author: Paul Kienzle <pkienzle@users.sf.net> ## 2001-02-08 ## * initial release function y = filter2 (b, x, shape) if (nargin < 2 || nargin > 3) print_usage (); endif if (nargin < 3) shape = "same"; endif [nr, nc] = size (b); y = conv2 (x, b(nr:-1:1, nc:-1:1), shape); endfunction