pop_select sorttrials error when trying to select channels

[amisepa]

Trying to simply select some EEG channels:

EEG = pop_select( EEG, 'channel',{'ROC1','ROC2','ROC3','ROC4','ROC5','ROC6','ROC7','ROC8','ROC9','ROC10','ROC11','ROC12','ROC13','ROC14','ROC15'});

And for some reason I get this error:

in pop_select, even though g.sort is empty, g.sorttrial is set to on by default. And my data are continuous so I think that triggers the error.

Cedric

[arnodelorme]

Can you post your dataset?

[amisepa]

@arnodelorme

dataset: https://drive.proton.me/urls/B989CRNFWG#WalrQsBo0xFQ

filepath = '/Users/cedriccannard/Downloads/dataset1';
filename = 'sub-01_ses-ieeg01_task-ccep_run-01_ieeg.mefd';
EEG = pop_MEF3(fullfile(filepath, filename)); % eeglab MEF3 plugin

% select some channels
EEG = pop_select( EEG, 'channel', {'ROC1' 'ROC2' 'ROC3' 'ROC4'}); % --> sorttrial error above

I found the issue: pop_MEF3 defines EEG.trials = 0 during import. I fixed it locally but would need to fix the pop_MEF3 plugin directly and make a new release. There are a few other issues so I'll do that when I address all of them.

Could be good to have a fallback in pop_select though for when EEG.trials is just not defined well (this could probably happen with other importation plugins), check size(EEG.data), and put 1 if continuous or number of events if epoched?

Cedric

[arnodelorme]

OK, I will have a look

…

On Oct 18, 2025, at 23:14, Cedric Cannard ***@***.***> wrote: amisepa left a comment (sccn/eeglab#896) @arnodelorme dataset: https://drive.proton.me/urls/B989CRNFWG#WalrQsBo0xFQ filepath = '/Users/cedriccannard/Downloads/dataset1'; filename = 'sub-01_ses-ieeg01_task-ccep_run-01_ieeg.mefd'; EEG = pop_MEF3(fullfile(filepath, filename)); % eeglab MEF3 plugin % select some channels EEG = pop_select( EEG, 'channel', {'ROC1' 'ROC2' 'ROC3' 'ROC4'}); % --> sorttrial error above I found the issue: pop_MEF3 defines EEG.trials = 0 during import. I fixed it locally but would need to fix the pop_MEF3 plugin directly and make a new release. There are a few other issues so I'll do that when I address all of them. Could be good to have a fallback in pop_select though for when EEG.trials is just not defined well (this could probably happen with other importation plugins), check size(EEG.data), and put 1 if continuous or number of events if epoched? Cedric — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you were mentioned.Message ID: ***@***.***>