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## 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} {[@var{w}] =} blackmanharris (@var{L})
## Compute the Blackman-Harris window.
## @seealso{rectwin, bartlett}
## @end deftypefn

function [w] = blackmanharris (L)

  if (nargin < 1)
    print_usage;
  elseif(! isscalar(L))
    error("L must be a number");
  endif

  if (L == 1)
    w = 1;
  else
    N = L-1;
    a0 = 0.35875;
    a1 = 0.48829;
    a2 = 0.14128;
    a3 = 0.01168;
    n = (0 : N)';
    w = a0 - a1.*cos(2.*pi.*n./N) + a2.*cos(4.*pi.*n./N) - a3.*cos(6.*pi.*n./N);
  endif

endfunction