[Eeglablist] The number of the ICA components is smaller than the number of channels.

[hui zhang]

Hi Arno,

Thank you for your suggestions.
I fixed it out later that it might because of my data. After highpass filter
the error is disappear now.
Thanks

On Tue, Mar 8, 2011 at 2:02 PM, Arnaud Delorme <arno at ucsd.edu> wrote:

> Dear Hui,
>
> as the warning says, this is probably due to some problem with Matlab when
> computing the rank of your Matrix. You should upgrade to a newer Matlab
> version and this should be fine.
>
> Best regards,
>
> Arno
>
> On Feb 4, 2011, at 12:39 PM, hui zhang wrote:
>
> Hi,
>
> When using the function of pop_runica to run ica on epoched data, I got the
> following message:
> *
> Attempting to convert data matrix to double precision for more accurate ICA
> results.
> Warning: fixing rank computation inconsistency (39 vs 38) most likely
> because running under Linux 64-bit MatlabData rank (39) is smaller than the
> number of channels (62).
>
> Input data size [39,654000] = 39 channels, 654000 frames/nAfter PCA
> dimension reduction,
>   finding 39 ICA components using extended ICA.*
>
> The matlab code:
> *eeglab;
> EEG = pop_loadset('filename',filename);
> EEG = pop_runica(EEG, 'icatype', 'runica', 'chanind',[2:63], 'extended',
> 1);*
>
> I ran this code on datasets of previous project, it seems fine.
> The version of eeglab installed on my computer is: eeglab9.0.1.2b.
>
> Does anyone have any idea on this? Is there any ways I can turn the pca off
> in my code?
>
> Thanks in advance!
>
> -Hui
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