[Eeglablist] Number of subjects on study

Arnaud Delorme arno at ucsd.edu
Mon Jun 21 10:27:30 PDT 2010


Dear Almeida,

there is no reason that EEGLAB should not be able to process more than 37 subjects.
We are processing studies with more than 300 subjects. 

Your problem arises because you have precomputed some files using 37 subjects and then try to do it again using 38 subjects. EEGLAB seems to have a problem with recognizing your precomputed files. The easy way around is to check the "recompute" box in the pre-computing graphic interface. We are working on fixing the problem.

Thanks for your feedback.
Arno

On Jun 16, 2010, at 11:56 AM, Pedro R. Almeida wrote:

> Hi,
> 
> We´re just starting to use EEGLAB to process a few files from two groups of
> subjects. Everything has worked fine up to the point when we had to plot channel
> grandaveraged ERPs and get channel statistics for the ERP timecourse. It seems
> EEGLAB won´t accept more than 37 subjects per study. As soon as we include a
> 38th subject and ask for a channel ERP plot we get the following message:
> 
> 
> Reading erp data...??? Index exceeds matrix dimensions.
> 
> Error in ==> std_readerp>std_readerpsub at 485
>    if isfield(erpstruct, 'labels'), chanlab{k} = erpstruct.labels{k}; end;
> 
> Error in ==> std_readerp at 220
>                    if strcmpi(dtype, 'erp') alldata{c, g} = std_readerpsub(
> ALLEEG, setinds{c,g}(:), allinds{c,g}(:), opt.timerange)';
> 
> Error in ==> std_erpplot at 322
>        [STUDY erpdata alltimes] = std_readerp(STUDY, ALLEEG, 'channels',
> opt.channels, 'timerange', opt.timerange, ...
> 
> Error in ==> pop_chanplot at 302
>            eval(a); STUDY.history =  sprintf('%s\n%s',  STUDY.history, a);
> 
> 
> 
> We've searched the mailing list and found no such problem, so we must be getting
> something basic wrong.
> We´re not getting any further problems with other plots or measures on the
> channel or components analysis. Any help with this would be much appreciated.
> 
> Thank you,
> 
> Pedro Almeida
> 
> 
> 
> -- 
> 
> Pedro R. Almeida
> 
> Neuropsychophysiology Laboratory
> Faculty of Psychology and Education Sciences
> University of Porto
> Rua Dr. Manuel Pereira da Silva
> 4200-392 Porto (Portugal)
> Tel. +351 226079700 (ext. 301)
> Site: http://www.fpce.up.pt/labpsi/
> Email: palmeida at fpce.up.pt
> 
> 
> 
> -- 
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