Exporting boundary events created in EEGLAB

Question

Ludovica Garritano 2023-9-23

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https://ww2.mathworks.cn/matlabcentral/answers/2024777-exporting-boundary-events-created-in-eeglab

回答： Sachin Lodhi 2023-10-4

Hi, I'd like to export to a .txt file the boundary events with their latencies and duration form EEG struct of EEGLAB. In the field EEG.event there's the field 'type' in which all events are present: boundary, square and rt. How do I extract only the boundary ones?

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Answer 1

Sachin Lodhi 2023-10-4

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Hi Ludovica,

Based on my understanding, it seems that you are seeking guidance on extracting ‘latencies’ and ‘durations’ of events with ‘type’ as ‘boundary’. You can use the provided code as a starting point and make the necessary custom changes to suit your specific requirements:

EEG=struct;
EEG.event(1).type = 'square';EEG.event(1).position = 1;EEG.event(1).latencies = rand;EEG.event(1).urevent = 2 * rand; EEG.event(1).duration = 4 * rand;
EEG.event(2).type = 'boundary';EEG.event(2).position = 2;EEG.event(2).latencies = rand;EEG.event(2).urevent = 2 * rand; EEG.event(2).duration = 4 * rand;
EEG.event(3).type = 'rt';EEG.event(3).position = 3;EEG.event(3).latencies = rand;EEG.event(3).urevent = 2 * rand; EEG.event(3).duration = 4 * rand; 
EEG.event(4).type = 'boundary';EEG.event(4).position = 3;EEG.event(4).latencies = rand;EEG.event(4).urevent = 2 * rand; EEG.event(4).duration = 4 * rand;
EEG = struct with fields:
    event: [1×4 struct]
L=ismember({EEG.event.type},{'boundary'});
exportedData = [EEG.event(L).latencies; EEG.event(L).duration]'
exportedData = 2×2
    0.3033    3.6549
    0.3962    1.9749