<div dir="ltr">Dear Nynke,<div><br></div><div>My initial guess is that you may have different epoch lengths in your datasets in STUDY. Please check it.</div><div><br></div><div>Makoto</div></div><div class="gmail_extra"><br>
<br><div class="gmail_quote">2013/11/14 Laan, L.N. van der (Nynke) <span dir="ltr"><<a href="mailto:L.N.vanderLaan@uu.nl" target="_blank">L.N.vanderLaan@uu.nl</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Hello all, <u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I am using EEGlab to calculate and plot grand mean ERP’s (over multiple subjects) for two conditions. However, when I precompute the channel measures I get a message saying: ‘Cannot compute ERSPS because datasets do not have the same number
of data points’. Afterwards I am not able to plot the channel measures (nothing happens) so I guess that the channel measures were not precomputed.
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Some background information: The input datasets for the study are epoched (and preprocessed/filtered/etc.) so for each subject I have two files (Subject1_conditionA and Subject1_conditionB). I have not performed ICA.
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">The only thing that I want is an ERPimage from both conditions (for a few channels of interest).
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Does anyone know what is causing the problem? Is it a problem when the number of epochs is not equal (i.e., in some subjects I have 1-2 more trials of condition A or B)?
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Best regards, <u></u><u></u></p>
<p class="MsoNormal">Nynke<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
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-- <br><div dir="ltr">Makoto Miyakoshi<br>Swartz Center for Computational Neuroscience<br>Institute for Neural Computation, University of California San Diego<br></div>
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