/usr/share/octave/packages/signal-1.3.0/mexihat.m is in octave-signal 1.3.0-1.
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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 | ## 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{psi,x}] =} mexihat (@var{lb,ub,n})
## Compute the Mexican hat wavelet.
## @end deftypefn
function [psi,x] = mexihat(lb,ub,n)
if (nargin < 3); print_usage; endif
if (n <= 0)
error("n must be strictly positive");
endif
x = linspace(lb,ub,n);
psi = (1-x.^2).*(2/(sqrt(3)*pi^0.25)) .* exp(-x.^2/2) ;
endfunction
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