[Eeglablist] Mismatch in duration between EEG struct and eegplot()

[Cedric Cannard]

Dear Oda,

You probably forgot to update some other variables in your command lines, which are normally updated automatically when using the GUI.

Try to add this line before plotting:
EEG = eeg_checkset(EEG);
 


Cedric Cannard, PhD


Sent with Proton Mail secure email.

------- Original Message -------
On Tuesday, June 27th, 2023 at 1:02 AM, Oda van Jole via eeglablist <eeglablist at sccn.ucsd.edu> wrote:


> Hi,
> 
> 
> I have encountered a strange problem, namely a mismatch in duration between EEG struct and the x-axis in eegplot(). I am pre-processing a resting state EEG recording that consists of 5 minutes eyes open (EO) and 5 minutes eyes closed (EC), in addition to some seconds before, between, and after these sections. I extract the two 5 min sections using pop_select() into an EEG struct (EEGconds) containing the resulting two EEG structs from pop_select() - EO and EC. For each of them, EEG.xmax, size(EEG.data, 2), and the "Epoch end (sec)" in GUI indicates a duration of 300s as expected. When calling eegplot() from code, the x-axis will go to 600 seconds, even with an eeglab redraw first. However, if I use eegplot() manually via GUI, it stops at the 300 sec as expected. Why does this happen? Am I doing something wrong?
> 
> 
> Code:
> 
> 
> % Extract sections
> 
> EOstart = EEG.event(find([EEG.event.edftype] == 1)).latency;
> 
> EOend = EEG.event(find([EEG.event.edftype] == 2)).latency;
> 
> EEGEO = pop_select(EEG, 'point', [EOstart, EOend]);
> 
> % Repeat for EC but with correct event edftypes.
> 
> 
> EEGconds.EO = EEGEO; EEGconds.EC = EEGEC;
> 
> 
> EEG = EEGconds.EO;
> 
> EEG.xmax % ~300
> 
> size(EEG.data, 2)/EEG.srate % ~300
> 
> eegplot(EEG.data) % Now I can scroll to 600 sec
> 
> eeglab redraw;
> 
> eegplot(EEG.data) % can still scroll to 600s
> 
> 
> This also occurs even if I delete EEGconds from the workspace after assigning EEGconds.EO to EEG.
> 
> 
> Thanks very much in advance for your help!
> 
> 
> Best wishes,
> 
> Oda van Jole
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