Can't load datasets in EEGLAB using script

I'm trying to create a loop that can load and preprocess EEG data sets, here is my code and the reoccuring error

[ALLEEG, EEG, CURRENTSET] = eeg_store( ALLEEG, EEG, 0 );
%% Get the list of subjects to load:
dataset = uigetdir;%allows user to manually select the folder where the data sets are stored
subjectlist = dir(dataset);
subjectlist = subjectlist(~ismember({subjectlist.name},{'.','..'}));
SUB = {subjectlist(:).name};
filepath = {subjectlist(:).folder};
%%  
%load data
for i = 1 : length(SUB)
    
    % 0. Select subject id:
    %subject = subjectlist(i);

    % Print info to the command window
   % display('Processing Subject %s\n', SUB(i));
        
    %Define subject path based on study directory and subject ID of current subject
    Subject_Path = filepath{i};
    Subject_Path = convertCharsToStrings(Subject_Path);

    % 1. Load subject data:
    % subject_data = load_subject_data(cfg,subject);
    [ALLEEG EEG CURRENTSET ALLCOM] = eeglab;
    EEG = pop_loadset('filename', SUB{i},'filepath', Subject_Path);
    EEG = eeg_checkset(EEG);
    
end

eeglab redraw;

Answer 1

[Diego Caro]

Hi, Elise

Your code seems to run fine for me after trying it with some of my datasets. I am using EEGLAB v2021.1. However, the code you provided does not store the EEG's structures of the loaded datasets. You can use the following code to save them in a structure, which is helpful to work with them.

%% Get the list of subjects to load:
% this is the first section of your code
dataset = uigetdir;%allows user to manually select the folder where the data sets are stored
subjectlist = dir(dataset);
subjectlist = subjectlist(~ismember({subjectlist.name},{'.','..'}));
SUB = {subjectlist(:).name};
filepath = {subjectlist(:).folder};

%% This saves all EEG's in the eegs struct
eeglab nogui
eegs = struct('sub',cell(1,length(SUB)));
for i = 1:length(SUB)
    file = fullfile(filepath{i},SUB{i});
    eegs(i).sub = pop_loadset(file);
    eegs(i).sub = eeg_checkset(eegs(i).sub);
end
eeglab redraw

Let me know if it works for you.

Regards,

Diego.

[Elise]

No, still the same error

[Diego Caro]

I'm sorry to hear that. There are a few more things you can try.

1. Try loading your datasets (.set files) manually using the eeglab graphic interface and make sure your signals are in good state.
2. Run the code I shared using the dataset I provide (Sub07B_alpha.set). The eeglab window should look something like this:

If the code runs fine, that means something in your datasets may be corrupted and thus, eeglab cannot import the file. If the code throws you the same error, or if your dataset loads properly with the graphical interface, but not with the code, maybe consider switching to other EEGLAB version.

Hope this helps to resolve your issue.

Regards,

Diego.