[Eeglablist] error when applying REG-ICA

[Manousos Klados]

Dear Sara,

It seems that your reasoning is correct. Please try to move the EOG signals
in the last rows of the EEG.data matrix. I'll note this issue in order to
be solved in a later version of REGICA.

Thank you a lot for you help
Manousos Klados

2012/3/21 Sara Assecondi <s.assecondi at bham.ac.uk>

> Dear Manousos, dear list,
>
> I would like to use REG-ICA to remove blinks from EEG data.
> However, I have encountered a problem so far: it seems to me that
> pop_regica.m "does not like" when the EOG channel index does not correspond
> to the last row of the data matrix.
>
> I have a dataset of 28 channels and, let's say my EOG channel is number 26.
> If I run REG-ICA I get the following message:
> >> EEGLAB error in function pop_regica() at line 448.
>
> This is the piece of code that I think is giving me the problem:
> >>tmp_dataa=EEG.data(g.chanind,:,:); % line 427-432
> >>EOG=EEG.data(EOGindex,:,:);
> >>EEG.data=zeros(size(tmp_dataa));
> >>EEG.data=tmp_dataa;
> >>EEG.icachansind = g.chanind;
> >>EEG.nbchan=g.nbchan;
> >> ...
> >>tmpdata = reshape( EEG.data(g.chanind,:,:), length(g.chanind),
> EEG.pnts*EEG.trials); % line 448
>
> In my case (28channel, EOG index 26), g.chanind=[1:25,27,28], however, in
> line 427-432 EEG.data is reassigned to a matrix of
> size(length(g.chanind),x,x) that in my case is (27,x,x). Therefore
> g.chanind(end)=28 is out of range.
>
> If this actually is the problem, in my case it is easy to solve, but I was
> just wondering if my reasoning is correct or I misunderstood something.
>
> Thank you all in advance for your help
>
> Best regards
> Sara
>



-- 
Manousos A. Klados
________________________________________________
B.Sc Mathematics
M.Sc Medical Informatics
________________________________________________
PhD Candidate -- Research Assistant
Group of Applied Neurosciences
Lab of Medical Informatics
School of Medicine
Aristotle University of Thessaloniki
P.O. Box 323 54124 Thessaloniki Greece
_________________________________________________
Tel: +30-2310-999332
Fax:+30-2310-999263
Website: http://lomiweb.med.auth.gr/gan/mklados

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