<html><body><DIV>One way this can happen is if the data has a rank less than the number of variables (that is, some of the variables are informationally redundant or uninformative). For example, are any of the channels perfectly correlated? This can happen if you use a mean mastoids reference and include both of the mastoid channels (they will have a perfect -1 correlation). This can also happen if you have a bad channel and it is completely flat. There are a number of other scenarios that can cause this too.<BR></DIV>
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Joseph Dien</PRE><PRE style="FONT-FAMILY: Helvetica,Arial,sans-serif; FONT-SIZE: 13px" _mce_style="font-family: Helvetica,Arial,sans-serif; font-size: 13px;">http://homepage.mac.com/jdien07/</PRE></DIV>
<DIV><BR>On Sep 06, 2011, at 02:18 PM, Paul Kieffaber <pdkieffaber@wm.edu> wrote:<BR><BR></DIV>
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<DIV class=_stretch>EEGlabers,<BR>I'm having a very strange issue running runica/binica from the command<BR>line in 64-bit Matlab 7.12.0 (R2011a) under Ubuntu linux. The data<BR>are 65 channels by 700 samples by 500 trials. Runica.m (from command<BR>line or EEGlab menus) is returning a complex-valued "weights" matrix<BR>and Binica.m (run from command line) is returning "weights" and<BR>"sphere" matrices full of NaNs. I've run ICA on this computer before<BR>with no trouble. This is happening with an entire sample of 30<BR>participants. There doesn't seem to be anything unusual with the<BR>data. Now the really bizarre thing... for some of the participant's<BR>data, runica/binica each run successfully if I use only a subset of<BR>the trials. In some cases they will only run (and return real<BR>numbers) with just one trial, but other subjects will run with up to<BR>50 trials. I haven't ever seen anything like this and am now<BR>completely baffled.<BR><BR>Any help/advice would be greatly appreciated.<BR><BR>paul<BR>-- <BR>-----------------------------------------------------<BR>Paul Kieffaber, PhD.<BR>Assistant Professor<BR>Department of Psychology &<BR>Program in Neuroscience<BR>The College of William & Mary<BR>(757) 221-1965<BR><A href="mailto:pdkieffaber@wm.edu" _mce_href="mailto:pdkieffaber@wm.edu">pdkieffaber@wm.edu</A><BR>-----------------------------------------------------<BR>_______________________________________________<BR>Eeglablist page: <A href="http://sccn.ucsd.edu/eeglab/eeglabmail.html" _mce_href="http://sccn.ucsd.edu/eeglab/eeglabmail.html">http://sccn.ucsd.edu/eeglab/eeglabmail.html</A><BR>To unsubscribe, send an empty email to <A href="mailto:eeglablist-unsubscribe@sccn.ucsd.edu" _mce_href="mailto:eeglablist-unsubscribe@sccn.ucsd.edu">eeglablist-unsubscribe@sccn.ucsd.edu</A><BR>For digest mode, send an email with the subject "set digest mime" to <A href="mailto:eeglablist-request@sccn.ucsd.edu" _mce_href="mailto:eeglablist-request@sccn.ucsd.edu">eeglablist-request@sccn.ucsd.edu</A><BR></DIV></DIV></BLOCKQUOTE></DIV></body></html>