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Yes, this is correct and this has been fixed quite a while ago
(although it is not yet reflected in the EEGLAB version avaiable on the
internet). This will be made avaiable in the new release. Testing
fastica, it remains that, in my personal experience, it fails to
converge on very big datasets with more thatn 300 000 sample points.<br>
<br>
Best,<br>
<br>
Arno<br>
<br>
Dan Keith wrote:
<blockquote cite="midp06110400bf9035904423@%5B10.0.1.4%5D" type="cite">
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<title>Bug in pop_runica.m... fastica() called with
out-of-order</title>
<div><font color="#000000" face="Helvetica">Hi,<br>
<br>
(I sent this msg about two weeks ago, but it never showed up on the
list)<br>
<br>
I was trying to use the fastica algorithm via pop_runica.m within
EEGLAB. I was getting horrible results on my decompositions. Looking
at the code in pop_runica.m, I noticed that the order of the result
arguments to fastica on line 512 was inconsistent with the documented
order of arguments in fastica.<br>
<br>
Specifically, the fastica function expects to return [icasig,A,W] as
the components, mixing, and unmixing matrices, respectively. However,
the call used in pop_runica.m is:<br>
[ ICAComp, EEG.icaweights, EEG.icawinv ] =
fastica(...)<br>
which seems to be backwards.<br>
<br>
If I swap the last two result args:<br>
[ ICAComp, EEG.icawinv, EEG.icaweights ] =
fastica(...)<br>
then fastica gives the correct results when executed via
pop_runica.m<br>
<br>
Please fix this bug in EEGLAB. I believe it may give a distorted
impression of the suitability of fastica. Effectively, fastica is
unusable via pop_runica.m in the current EEGLAB implemenetation. Note
that ICAComp is ignored in pop_runica; the components are computed in
pop_runica.m from the unmixing matrix.<br>
<br>
thanks for your attention,<br>
<br>
dan keith<br>
Neuroinformatics Center<br>
University of Oregon</font><br>
</div>
<x-sigsep></x-sigsep>
<pre>--
</pre>
<div>Dan "Bud" Keith - <a class="moz-txt-link-abbreviated" href="mailto:dkeith@cs.uoregon.edu">dkeith@cs.uoregon.edu</a></div>
<pre wrap="">
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</blockquote>
<br>
<br>
<div class="moz-signature">-- <br>
<br>
<b><font face="Arial,Helvetica"><font size="+1">Arnaud Delorme, Ph.D.</font></font></b>
<br>
<font face="Arial,Helvetica"><font size="+1"><font color="#3333ff">Swartz
Center for Computational Neuroscience,</font> <font color="#3333ff">INC,
University of San Diego California</font></font></font>
<br>
La Jolla, CA92093-0961, USA
<p><font face="Arial,Helvetica"><b>Tel</b> :<i>(+1)-858-458-1927 ext 15</i></font>
<br>
<font face="Arial,Helvetica"><b>Fax</b> :<i>(+1)-858-458-1847</i></font>
<br>
<font face="Arial,Helvetica"><b>Web page</b>: <a
href="http://www.sccn.ucsd.edu/%7Earno">sccn.ucsd.edu/~arno</a></font>
<br>
<font face="Arial,Helvetica"><b>To think upon</b>:</font></p>
<blockquote><dt><font face="Arial,Helvetica"> What we want is to become
ourselves. Nothing that is should be suppressed; nothing is
superfluous.
<font size="-5"><br>
<br>
</font></font></dt>
<dd><font face="Arial,Helvetica"><i>Friedrich Nietzche</i></font></dd>
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