[Eeglablist] erpimage STUDY, number of lines inconsistency

Arnaud Delorme arno at ucsd.edu
Tue Jan 28 19:35:09 PST 2014


Dear Max,

we had this problem a while ago but it was fixed in EEGLAB 12. Which version of EEGLAB are you using?
It is possible that the problem remains for you as the computation for the number of lines is fairly complex.
Have you tried changing "nlines" as well?

Sometimes there is not enough lines in the original ERPimage and that could be an issue as well. In that case decrease the 'nlines' parameter.
If nothing fixes it, please upload some data and submit a bug at http://sccn.ucsd.edu/eeglab/bugzilla

Best,

Arno

On Jan 14, 2014, at 12:25 AM, Maximilien Chaumon <maximilien.chaumon at gmail.com> wrote:

> Hi,
> 
> I compute erpimages for my STUDY using the following line
> 
> [STUDY ALLEEG] = std_precomp(STUDY, ALLEEG, {},'interp','on','recompute','on','erpim','on','erpimparams',{'nlines' 70 'smoothing' 5 'phasesort' [0 25 8 13 180]});
> 
> It computes fine but crashes when reading, with (e.g.)
> 
> STUDY = std_erpimageplot(STUDY,ALLEEG,'channels',{'O1'});
> 
> for at least one of my subjects, the erpimage has one line less/more than all others, so it crashes in std_readfile at line 243.
> This seems to come from erpimage/movav, where the moving average is computed across trials. This function outputs a 1536 x 54 matrix for some subjects and 1536 x 55 for some others. I suppose it's a problem with rounding, decimation factor or such, and I'm out of ideas to fix it.
> 
> I tried a few 'smoothing' constants (5 10 ...) the only fix I found so far is to not smooth the erpimage...
> Any idea/comment on this is appreciated.
> I use eeglab 13.
> Max
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