[Eeglablist] How to make an ICA run in less than a week?

[Scott Makeig]

James -

I would not suggest epoching the data before ICA decomposition, unless to
remove highly irrelevant data periods. I do suggest running binica (on a
64-bit machine) instead of (Matlab) runica -- or still better, AMICA,
available from Jason Palmer. You mighty consider downsampling your data to
512. Also, be sure to check that the solution is not 'blowing up' because
of insufficient data rank.

Scott Makeig

On Thu, Jul 5, 2012 at 5:24 PM, James Schaeffer <schaefj3 at gmail.com> wrote:

> Dear eeglablist,
>
> I am running ICAs on 10 minutes of Biosemi EEG data, collected from 128
> channels, and sampled at 2048 Hz. However, the ICAs have been running for a
> few days without much progress. Two computers have 8G RAM and an Intel(R)
> Xeon(TM) CPU 2.80GHz. One has been running an ICA for 6 days and is on step
> 33; the other, for 4 days, and is on step 28. Another computer has 12G RAM
> and an Intel(R) Xeon(R) CPU 5110 @ 1.60GHz; it has been running for 3 days
> and is on step 60. All are running openSUSE 12.1 (x86_64), with eeglab
> version 10.2.2.4b. The 'free' command indicates that they are not using any
> swap space.  Should it be taking this long?  Is it possible that we have
> more than the one copy of the data in ram or that Matlab or Eeglab has
> placed something else in ram, or is busy with other processes? Is there
> anything I can do to speed up this process? Any help would be greatly
> appreciated.
>
> Thanks in advance,
> James
>
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-- 
Scott Makeig, Research Scientist and Director, Swartz Center for
Computational Neuroscience, Institute for Neural Computation; Prof. of
Neurosciences (Adj.), University of California San Diego, La Jolla CA
92093-0559, http://sccn.ucsd.edu/~scott
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