/usr/share/octave/packages/signal-1.3.0/gaussian.m is in octave-signal 1.3.0-1.
This file is owned by root:root, with mode 0o644.
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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 | ## Copyright (C) 1999 Paul Kienzle <pkienzle@users.sf.net>
##
## 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} {@var{w} =} gaussian (@var{n}, @var{a})
##
## Generate an @var{n}-point gaussian convolution window of the given
## width. Use larger @var{a} for a narrower window. Use larger @var{n}
## for longer tails.
##
## w = exp ( -(a*x)^2/2 )
##
## for x = linspace ( -(n-1)/2, (n-1)/2, n ).
##
## Width a is measured in frequency units (sample rate/num samples).
## It should be f when multiplying in the time domain, but 1/f when
## multiplying in the frequency domain (for use in convolutions).
## @end deftypefn
function x = gaussian(n, w)
if nargin < 1 || nargin > 2
print_usage;
endif
if nargin == 1, w = 1; endif
x = exp(-0.5*(([0:n-1]'-(n-1)/2)*w).^2);
endfunction
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