[Eeglablist] Error while using ICA

[Toby Fernsler]

Dear Hecke,

Your data has rank 0. ; )
A very short time window could cause that (fewer time points than 
channels). Or having several channels of zeros. Or the same channel 
values repeated in each channel. Take a look at your channel data to see 
if there isn't something odd about it, say by using eeglab > Plot > 
Channel data (scroll).

Regards,
Toby

Hecke wrote:
> Hi all,
>
> Is someone familiar with the Error-Codes of runica()?
> Since some trials with ICA I get the error-message:
>
>   
>> Data has rank 0. Cannot compute 63 components.
>>     
>
> I did not get this messages the first times I take a new datafile. Does
> eeglab alter the original data files?
> All I do is to read my file with pop_loadbv(), store it in pop_newset(),
> check it with eeg_checkset(), set EEG.setname and EEG.subject directly
> and than run:
>
> pop_runica( EEG, 'icatype', 'runica', 'dataset', CURRENTSET, ...
>                       'extended', 1, 'verbose', 'on');
>
> What has to be wrong in the data, to produce this error? (Do not say,
> that my data-matrix has rank zero!;-))
>
> btw: what means:
> % is pca already an option?
> % -------------------------
> in pop_runica() line 458 ?
>
> I first encountered the above error, when enabling pca.
>
> thanx a lot
> 	Hecke
>   
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