[Eeglablist] Error in "runica"

[Makoto Miyakoshi]

Dear Roni,

My initial guess is that you re-referenced the data before ICA. See the
following link.

http://sccn.ucsd.edu/wiki/Makoto%27s_preprocessing_pipeline#Re-reference_the_data_to_average

I'm sorry for the slow response.

Makoto

On Fri, Dec 12, 2014 at 3:28 AM, Roni Shafir <ronishafir1 at gmail.com> wrote:

> Hello all,
> I'm trying to run "runica" on our EEG data in order to remove eye-blinks
> artifacts.
> The data is recorded using BioSemi with 64 scalp electrodes and
> additional 5 (EX1-EX5) reference electrodes. The number of channels for the
> "runica" function is 72 (including EX6-EX8).
> With most of the subjects, the function returns 72 ICs. However, with some
> subjects we get only 71 ICs. What could be a possible reason for this
> variability?
> I'm receiving the following error massage:
>
> Attempting to convert data matrix to double precision for more accurate
> ICA results.
> Data rank (71) is smaller than the number of channels (72).
> runica(): Even number of input arguments???Error in runica (line 135)
> if nargin < 1
>
> Output argument "sphere" (and maybe others) not assigned during call to
>
> "C:\Users\Asus\Downloads\eeglab10_2_4_4a\eeglab10_2_4_4a\functions\sigprocfunc\runica.m>
> runica".
>
> Error in pop_runica (line 385)
>             [EEG.icaweights,EEG.icasphere] = runica( tmpdata, 'lrate',
> 0.001, g.options{:} );
>
> Error in Analyze_2249 (line 148)
>             EEG = pop_runica(EEG,
> 'icatype','runica','dataset',1,'options',{'extended' 1}); %Running Runica
> ICA
>
>
> I would appreciate your help.
> Thanks!
> Roni
>
>
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-- 
Makoto Miyakoshi
Swartz Center for Computational Neuroscience
Institute for Neural Computation, University of California San Diego
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