<div>Piotr,</div><div></div><div>I believe that ICA only returns as many components as runica determines ought to exist. Thus, if only 22 of the channels are linearly independent (perhaps because of electrode bridging), runica will only calculate 22 components. Another reason may arise from your operating system. We use MATLAB R2008a on a 64-bit Intel mac. Apparently, 64-bit versions of MATLAB have some problems identifying the number of linearly independent channels. In our case, when attempting to identify components from 132 channels, PCA with runica was only calculating 88 components.<br>
</div><div></div><div>-Keith</div><div>--</div><div>Research Aide</div><div>Belmonte Neuroscience Laboratory</div><div>Cornell University</div><br><div class="gmail_quote">On Tue, Oct 13, 2009 at 9:22 AM, Piotr Jaskowski <span dir="ltr"><<a href="mailto:jaskowski@vizja.pl">jaskowski@vizja.pl</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div lang="PL" link="blue" vlink="purple">
<div>
<p class="MsoNormal">Dear All,</p>
<p class="MsoNormal"><span> </span><span lang="EN-US">I run ICA with 32-channel segmented
data. I expected to get 32 ICA components. In fact, Ive got only 22
components and a following message:</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Input data
size [22,51775] = 22 channels, 51775 frames/nAfter PCA dimension reduction,</span></p>
<p class="MsoNormal"><span lang="EN-US"><span> </span>finding 22 ICA components using extended
ICA.</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Could anybody
explain me where the remaining 10 components disappeared? <span> </span></span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Best regards,</span></p>
<p class="MsoNormal"><span lang="EN-US">Piotr</span></p>
<div>
<p class="MsoNormal"><span>---------------------------------------------------</span></p>
<p class="MsoNormal"><span>Prof. Piotr Jaskowski, Ph.D.</span></p>
<p class="MsoNormal"><span lang="EN-US">Department of
Cognitive Psychology</span></p>
<p class="MsoNormal"><span lang="EN-US">University of
Finance and Management</span></p>
<p class="MsoNormal"><span>Pawia 55, 01-030 Warszawa, Poland</span></p>
</div>
<p class="MsoNormal"><span><a href="http://cogn.vizja.pl" target="_blank">http://cogn.vizja.pl</a></span></p>
<p class="MsoNormal"> </p>
</div>
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