[Eeglablist] Bug in pop_writeeeg() function ?

[Cedric Cannard]

Hi Pierre,

My intuition is that the event type (i.e. label) may be converted from character string to numerical or expected to be character but is numerical, or something like that. 

When using the GUI, did you try modifying the field "event mode import"?
See help bdf2biosig_events to learn about the different options. 

Also, you can try the last checkbox "alternative method using mexSLOAD" to see if it works better for your data. 

Cedric



On Wednesday, June 12th, 2024 at 2:14 AM, Pierre Vigneron via eeglablist <eeglablist at sccn.ucsd.edu> wrote:

> Hello the EEGLab community,
> 
> i'm using EEGLab 2023.0 and I experience a strange behaviour when I load
> and save a BDF file without altering it : the triggers are NOT the same.
> 
> Here is a very minimal example, based on the test.bdf file provided by
> EEGLab. Please note that I experience the VERY SAME issue when using the
> EEG GUI (File > Import and File > Export...)
> 
> 
> ------------------------------
> 
> clearvars
> close all
> 
> % This script tests the EEGLab BDF Read/Write functions
> 
> 
> f_in = '/opt/eeglab2023.0/sample_data/test_data/test.bdf';
> f_out = './test_out.bdf';
> 
> eeglab nogui
> eeg_in = pop_biosig(f_in);
> 
> pop_writeeeg(eeg_in, f_out, 'TYPE','BDF');
> eeg_out = pop_biosig(f_out);
> 
> eeg_in.event(1)
> eeg_out.event(1)
> 
> ------------------------------
> 
> The first event in eeg_in is :
> 
> struct with fields:
> 
> type: 254
> latency: 257
> urevent: 1
> 
> While the first event in eeg_out is :
> 
> struct with fields:
> 
> type: 10170
> latency: 257
> urevent: 1
> 
> As you can see, the type has changed !
> 
> Have you some clue about what's happening here ?
> 
> Thanks a lot for any advice !
> 
> BR
> 
> Pierre
> 
> P.S : this is a reupload (slightly updated) of my previous message (sent
> two days ago) because it does not appeared on the list, strangely ??
> 
> --
> Pierre Vigneron, PhD
> Ingénieur de Recherche mutualisé Modyco <https://urldefense.com/v3/__https://modyco.fr__;!!Mih3wA!BheMdsqDywo60rOkc7FRMy6f_ySs5iBKz8baZGGrLxif9eNe-wmTeTfmi0OYY9wy_b8dtcAo7Q89CHvS9opuH1E3y5zUNdk$ > / EconomiX
> 
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> 
> Université de Paris Nanterre
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