Mercurial > forge
view extra/lssa/inst/lombcoeff.m @ 10663:eddb56678a93 octave-forge
Updated tests, DESCRIPTION, etc. for lssa release.
author | benjf5 |
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date | Thu, 09 Aug 2012 16:08:18 +0000 |
parents | b2f0b3d25aed |
children | eb8ddfef5d9a |
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## Copyright (C) 2012 Benjamin Lewis <benjf5@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} {c =} lombcoeff (time, mag, freq) ## ## Return the coefficient of the Lomb periodogram (unnormalized) for the ## (@var{time},@var{mag}) series for the @var{freq} provided. ## ## @seealso{lombnormcoeff} ## @end deftypefn function coeff = lombcoeff (T, X, o) oT = o .* T; theta = atan2 (sum (sin (2 * oT)), sum (cos (2 * oT))) ./ (2 * o); coeff = (sum (X .* cos (oT - theta)) ^2 / sum (cos (oT - theta) .^2) + sum (X .* sin (oT - theta)) ^2 / sum (sin (oT - theta) .^2)); endfunction %!shared t, x, o, maxfreq %! maxfreq = 4 / (2 * pi); %! t = linspace (0, 8); %! x = (2 .* sin (maxfreq .* t) + %! 3 .* sin ((3/4) * maxfreq .* t) - %! 0.5 .* sin ((1/4) * maxfreq .* t) - %! 0.2 .* cos (maxfreq .* t) + %! cos ((1/4) * maxfreq .* t)); %! o = [maxfreq , (3/4 * maxfreq) , (1/4 * maxfreq)]; %!assert (lombcoeff (t, x, maxfreq), 1076.77574184435, 5e-10); %!assert (lombcoeff (t, x, 3/4*maxfreq), 1226.53572492183, 5e-10); %!assert (lombcoeff (t, x, 1/4*maxfreq), 1341.63962181896, 5e-10);