/usr/share/octave/packages/signal-1.3.2/parzenwin.m is in octave-signal 1.3.2-1+b1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 | ## Copyright (C) 2007 Sylvain Pelissier <sylvain.pelissier@gmail.com>
##
## This program 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 program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} parzenwin (@var{m})
## Return the filter coefficients of a Parzen window of length @var{m}.
## @seealso{rectwin, bartlett}
## @end deftypefn
function w = parzenwin (m)
if (nargin != 1)
print_usage ();
elseif (! (isscalar (m) && (m == fix (m)) && (m > 0)))
error ("parzenwin: M must be a positive integer");
endif
N = m - 1;
n = -(N/2):N/2;
n1 = n(find(abs(n) <= N/4));
n2 = n(find(n > N/4));
n3 = n(find(n < -N/4));
w1 = 1 -6.*(abs(n1)./(m/2)).^2 + 6*(abs(n1)./(m/2)).^3;
w2 = 2.*(1-abs(n2)./(m/2)).^3;
w3 = 2.*(1-abs(n3)./(m/2)).^3;
w = [w3 w1 w2]';
endfunction
%!assert (parzenwin (1), 1)
%!assert (parzenwin (2), 0.25 * ones (2, 1))
%% Test input validation
%!error parzenwin ()
%!error parzenwin (0.5)
%!error parzenwin (-1)
%!error parzenwin (ones (1, 4))
%!error parzenwin (1, 2)
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