?? mexhat.m
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function h = mexhat(nu) ;%MEXHAT Mexican hat wavelet in time domain.% H=MEXHAT(NU) returns the mexican hat wavelet with central % frequency NU (NU is a normalized frequency in Hz). %% NU : any real between 0 and 0.5 (default : 0.05).% H : time vector containing the mexhat samples. % length(H)=2*ceil(1.5/NU)+1.%% Example : % plot(mexhat);%% See also KLAUDER.% P. Goncalves, October 95% Copyright (c) 1995 Rice University%% ------------------- CONFIDENTIAL PROGRAM -------------------- % This program can not be used without the authorization of its% author(s). For any comment or bug report, please send e-mail to % f.auger@ieee.org if nargin==0, nu=0.05;elseif nargin>1, error('Too many input parameters');endif nu>0.5 | nu<0, disp('Warning : NU should be between 0 and 0.5');endN = 1.5 ;alpha = pi^2*nu^2 ;n = ceil(N/nu) ; t = -n:n ;h = nu*sqrt(pi)/2*exp(-alpha*t.^2).*(1-2*alpha*t.^2) ;
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