[Eeglablist] ICA runs slowly and returns complex numbers

[Makoto Miyakoshi]

Dear Jason,

I would like to ask your opinion about this.

Makoto


2013/11/12 Ilana Podlipsky <ilana.mlist at gmail.com>

> Hi All,
>
> Since I've recently changed my computer ICA in eeglab runs very very
> slowly and returns complex numbers.
> On my previous computer, on the same data I ran the same ICA  within an
> hour or two. On the new computer the same ICA takes more than 24 hours,
> After 512 steps it returns this message :
>
> Sorting components in descending order of mean projected variance ...
> Warning: Matrix is close to singular or badly scaled.
>          Results may be inaccurate. RCOND = 6.956943e-019.
>
> When I try to plot the ICA activations I don't see any traces and when I
> look into the EEG.icaact matrix I see only complex numbers. Tried both
> runica and binica.
> This has never happen to me with the old computer on the same dataset.
> Both the old and new computer run Win7 64bit, matlab 2008a and eeglab 12.
> The hardware of the computers is different.
>
> What could be the reason for this, and what can ?I do to solve this?
>
> Thanks for the help,
> Ilana
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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