<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Hi jan-mathijs</div><div><br></div><div>Unfortunately I get the same result whether or not I remove the mean. </div>
<div>Best,</div><div>-- Lucía</div><div><br>On May 2, 2013, at 9:57 AM, jan-mathijs schoffelen <<a href="mailto:jan.schoffelen@donders.ru.nl">jan.schoffelen@donders.ru.nl</a>> wrote:<br><br></div><blockquote type="cite">
<div>Hi Lucia,<div><br></div><div>Could you remove cfg.removemean = 'yes' and try again?</div><div><br></div><div>Best,</div><div><br></div><div>Jan-Mathijs</div><div><br><div><div>On Apr 29, 2013, at 2:38 AM, Lucia Melloni wrote:</div>
<br class="Apple-interchange-newline"><blockquote type="cite"><div>Hi!<br>I am trying to calculate coherence using ft_connectivityanalysis, but<br>I am getting only ones and infinity as output in cohspctrm with all of<br>
my data sets.<br><br>I first run ft_freqanalysis with<br>cfg.method = 'mtmfft';<br>cfg.taper = 'dpss';<br>cfg.output = 'fourier';<br>cfg.foilim = [1 45];<br>cfg.tapsmofrq = 1;<br>cfg.keeptrials = 'yes';<br>
cfg.keeptapers = 'yes';<br>freq = ft_freqanalysis(cfg, data);<br><br>Whether I do or I do not specify cfg.channel and cfg.channelcmb here<br>does not seem to make a difference for my problem later on. The<br>spectra look absolutely fine.<br>
<br>I then run ft_connectivityanalysis with<br>cfg.method = 'coh';<br>cfg.removemean= 'yes';<br>cfg.trials = 'all';<br>cfg.feedback = 'yes';<br>cfg.complex = 'abs';<br>coh = ft_connectivityanalysis(cfg, freq);<br>
<br>The cohspctrm looks like this:<br>val(:,:,1,1) =<br><br> 1 Inf Inf Inf Inf Inf Inf Inf Inf Inf Inf<br>Inf Inf Inf (etc.)<br><br>I get the following warning during ft_connectivityanalysis<br>
<br>Warning: Divide by zero.<br><blockquote type="cite">In ft_connectivity_corr at 103<br></blockquote> In ft_connectivityanalysis at 524<br>Warning: Divide by zero.<br><blockquote type="cite">In ft_connectivity_corr at 104<br>
</blockquote> In ft_connectivityanalysis at 524<br><br>The same happens if I try to calculate PLV through ft_connectivityanalysis.<br>This is with Fieldtrip version 20130422 and 20130427, Matlab R2009a,<br>Windows 7 (64bit).<br>
<br>Any advice?<br>Thanks!<br>Lucia<br>_______________________________________________<br>fieldtrip mailing list<br><a href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a><br><a href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br>
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<div>Jan-Mathijs Schoffelen, MD PhD </div><div><br></div><div>Donders Institute for Brain, Cognition and Behaviour, <br>Centre for Cognitive Neuroimaging,<br>Radboud University Nijmegen, The Netherlands</div><div><br></div>
<div>Max Planck Institute for Psycholinguistics,</div><div>Nijmegen, The Netherlands</div><div><br></div><div><a href="mailto:J.Schoffelen@donders.ru.nl">J.Schoffelen@donders.ru.nl</a></div><div>Telephone: +31-24-3614793</div>
<div><br></div><div><a href="http://www.hettaligebrein.nl">http://www.hettaligebrein.nl</a></div></div></span></div></span></div></span></div></span></div></span></div></span></div></span></div></span></span>
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