<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">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>http://mailman.science.ru.nl/mailman/listinfo/fieldtrip<br></div></blockquote></div><br><div>
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font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><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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