## Copyright (C) 1995, 1996, 1997 Friedrich Leisch ## ## 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 2, 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 file. If not, write to the Free Software Foundation, ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ## usage: spencer (X) ## ## returns Spencer's 15 point moving average of every single column of X ## Author: FL <Friedrich.Leisch@ci.tuwien.ac.at> ## Description: Apply Spencer's 15-point MA filter function retval = spencer (X) if (nargin != 1) usage ("spencer (X)"); endif [xr xc] = size(X); n = xr; c = xc; if (is_vector(X)) n = length(X); c = 1; X = reshape(X, n, 1); endif W = [ -3 -6 -5 3 21 46 67 74 67 46 21 3 -5 -6 -3 ] / 320; retval = fftfilt (W, X); retval = [zeros(7,c); retval(15:n,:); zeros(7,c);]; retval = reshape(retval, xr, xc); endfunction

Generated by Doxygen 1.6.0 Back to index