/usr/share/octave/packages/signal-1.3.2/rectwin.m is in octave-signal 1.3.2-1+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | ## 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} {} rectwin (@var{m})
## Return the filter coefficients of a rectangular window of length @var{m}.
## @seealso{boxcar, hamming, hanning}
## @end deftypefn
function w = rectwin (m)
if (nargin != 1)
print_usage ();
elseif (! (isscalar (m) && (m == fix (m)) && (m > 0)))
error ("rectwin: M must be a positive integer");
endif
w = ones (m, 1);
endfunction
%!assert (rectwin (1), 1)
%!assert (rectwin (2), ones (2, 1))
%!assert (rectwin (100), ones (100, 1))
%% Test input validation
%!error rectwin ()
%!error rectwin (0.5)
%!error rectwin (-1)
%!error rectwin (ones (1, 4))
%!error rectwin (1, 2)
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