X-Git-Url: https://git.creatis.insa-lyon.fr/pubgit/?p=CreaPhase.git;a=blobdiff_plain;f=octave_packages%2Fsignal-1.1.3%2Fmexihat.m;fp=octave_packages%2Fsignal-1.1.3%2Fmexihat.m;h=410b462f577ac290dacd99fe63a5f5f711dc139e;hp=0000000000000000000000000000000000000000;hb=f5f7a74bd8a4900f0b797da6783be80e11a68d86;hpb=1705066eceaaea976f010f669ce8e972f3734b05

diff --git a/octave_packages/signal-1.1.3/mexihat.m b/octave_packages/signal-1.1.3/mexihat.m
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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{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; end
+
+  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