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<p class=MsoNormal>Hi everyone,<o:p></o:p></p>
<p class=MsoNormal>I am having some difficulty using the cluster-based
permutations in both time and frequency domains. I have just 8 channels of
discrete LFP positions, so I thought it may be problematic to cluster them
together in space. I therefore first tried clustering only in time (ERP)
or time-frequency (ERS/ERD) by using a single channel. I used [stat]
= ft_timelockstatistics(cfg, ave_spatial, ave_non_spatial) with the following cfg:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>method: 'montecarlo'<o:p></o:p></p>
<p class=MsoNormal>statistic: 'indepsamplesT'<o:p></o:p></p>
<p class=MsoNormal>correctm: 'cluster'<o:p></o:p></p>
<p class=MsoNormal>clusteralpha: 0.0500<o:p></o:p></p>
<p class=MsoNormal>clusterstatistic: 'maxsum'<o:p></o:p></p>
<p class=MsoNormal>tail: 0<o:p></o:p></p>
<p class=MsoNormal>clustertail: 0<o:p></o:p></p>
<p class=MsoNormal>alpha: 0.0250<o:p></o:p></p>
<p class=MsoNormal>numrandomization: 100<o:p></o:p></p>
<p class=MsoNormal>design: [1x267 double]<o:p></o:p></p>
<p class=MsoNormal>channel: 'F1'<o:p></o:p></p>
<p class=MsoNormal>minnbchan: 0<o:p></o:p></p>
<p class=MsoNormal>layout: 'layout.mat'<o:p></o:p></p>
<p class=MsoNormal>ivar: 1<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I get the following error message:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>??? Undefined function or method 'bwlabeln' for input
arguments of type 'double'.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Error in ==> findcluster at 89<o:p></o:p></p>
<p class=MsoNormal> [labelmat(spatdimlev, :, :), num] = bwlabeln(reshape(onoff(spatdimlev,
:, :), nfreq, ntime), 4);<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Error in ==> clusterstat at 194<o:p></o:p></p>
<p class=MsoNormal> posclusobs =
findcluster(reshape(postailobs,
[cfg.dim,1]),channeighbstructmat,cfg.minnbchan);<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Error in ==> statistics_montecarlo at 321<o:p></o:p></p>
<p class=MsoNormal> [stat, cfg] = clusterstat(cfg, statrand,
statobs,'issource',issource);<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Error in ==> statistics_wrapper at 285<o:p></o:p></p>
<p class=MsoNormal> [stat, cfg] = statmethod(cfg, dat,
cfg.design, 'issource',issource);<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Error in ==> ft_timelockstatistics at 96<o:p></o:p></p>
<p class=MsoNormal>[stat, cfg] = statistics_wrapper(cfg, varargin{:});<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’m assuming that part of the problem is that I don’t
have the Image Processing Toolbox, but is there a way to specify to not cluster
across channels? I’m a new user, so any advice is much appreciated.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks in advance!<o:p></o:p></p>
<p class=MsoNormal><span style='font-size:10.5pt;font-family:Consolas'>__________________________________________________________________________________</span><o:p></o:p></p>
<p class=MsoNormal>Allen Ardestani Email: <a
href="mailto:aardesta@ucla.edu">aardesta@ucla.edu</a><o:p></o:p></p>
<p class=MsoNormal>Phone: (310) 825-5528<o:p></o:p></p>
<p class=MsoNormal>Medical Scientist Training Program<o:p></o:p></p>
<p class=MsoNormal>David Geffen School of Medicine at UCLA<o:p></o:p></p>
<p class=MsoNormal>Semel Institute for Neuroscience and Human Behavior<o:p></o:p></p>
<p class=MsoNormal>760 Westwood Plaza<o:p></o:p></p>
<p class=MsoNormal>Los Angeles, CA 90095-1759<o:p></o:p></p>
<p class=MsoNormal>USA<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
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<p>----------------------------------</p>
<p>The aim of this list is to facilitate the discussion between users of the FieldTrip toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis.</p>
<p> http://listserv.surfnet.nl/archives/fieldtrip.html</p>
<p> http://www.ru.nl/fcdonders/fieldtrip/</p>