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gausswin.m    36 lines (31 with data), 1.2 kB

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## 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} =} gausswin (@var{m}, @var{a})
##
## Generate an @var{m}-point gaussian window of the given width. Use larger
## @var{a} for a narrow window. Use larger @var{m} for a smoother curve.
##
## w = exp ( -(a*x)^2/2 )
##
## for x = linspace(-(m-1)/m, (m-1)/m, m)
## @end deftypefn
function x = gausswin(m, w)
if nargin < 1 || nargin > 2
print_usage;
endif
if nargin == 1, w = 2.5; endif
x = exp ( -0.5 * ( w/m * [ -(m-1) : 2 : m-1 ]' ) .^ 2 );
endfunction