Mercurial > octave-dspies
view scripts/signal/hamming.m @ 18960:a5add7b660ac stable
build: Fix compiling GUI on Alpha platforms (bug #42839).
* libgui/Makefile.am: Use GNU Makefile filter-out command to remove
-mieee CFLAG option from CPPFLAGS passed to MOC command.
author | Rik <rik@octave.org> |
---|---|
date | Sat, 26 Jul 2014 07:50:38 -0700 |
parents | d63878346099 |
children |
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## Copyright (C) 1995-2013 Andreas Weingessel ## ## 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} {} hamming (@var{m}) ## Return the filter coefficients of a Hamming window of length @var{m}. ## ## For a definition of the Hamming window, see e.g., A. V. Oppenheim & ## R. W. Schafer, @cite{Discrete-Time Signal Processing}. ## @end deftypefn ## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at> ## Description: Coefficients of the Hamming window function c = hamming (m) if (nargin != 1) print_usage (); endif if (! (isscalar (m) && (m == fix (m)) && (m > 0))) error ("hamming: M has to be an integer > 0"); endif if (m == 1) c = 1; else m = m - 1; c = 0.54 - 0.46 * cos (2 * pi * (0:m)' / m); endif endfunction %!assert (hamming (1), 1) %!assert (hamming (2), (0.54 - 0.46)*ones (2,1)) %!assert (hamming (16), fliplr (hamming (16))) %!assert (hamming (15), fliplr (hamming (15))) %!test %! N = 15; %! A = hamming (N); %! assert (A (ceil (N/2)), 1); %!error hamming () %!error hamming (0.5) %!error hamming (-1) %!error hamming (ones (1,4))