Loop through multiple levels of subfolders to run .mat files

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Cassandra Martin 2022-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/1647830-loop-through-multiple-levels-of-subfolders-to-run-mat-files

评论： Cassandra Martin 2022-2-11

Hi, I'm new here and this is my first question (also very new to coding). I'll do my best to explain what I'm trying to do.

Here is my set up:

Participant Data > Subject (1-30) > trial 1 & trial 2 > apart & together > (7 total .mat files)

the names of the files are like: a_eo, t_eo, a_ec, t_ec, ..... so each subject has the same names of .mat files

I have a main code that can run the individual files, but to do 814 individually is ridiculous (wich I stared to do but realizd there has got to be a better way). I feel like this can be done with some nested loops, but I don't know how to loop through the folders since they contain letters and numbers in the folder names. I do have code that allows me to export the processed data to specific excel rows (for each subject), but I am also unsure of how to include this into the loops as I need the processed data not to be overwritten.

some help would be greately appreciated! Thank you!!

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Voss 2022-2-11

This thread may be useful to refer to: https://www.mathworks.com/matlabcentral/answers/124586-how-to-process-multiple-file-in-matlab

Other than that, I'm not sure I can help further without knowing more about your setup and exactly what you want to do, e.g., you have 7 .mat files per subject and 30 subjects for a total of 814 files?

Cassandra Martin 2022-2-11

Thanks I'll take a look.

Yes thats correct. I'd like to be able to run one script without having to manually change directories and the excel paths.

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Answer 1

Stephen23 2022-2-11

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https://ww2.mathworks.cn/matlabcentral/answers/1647830-loop-through-multiple-levels-of-subfolders-to-run-mat-files#answer_893910

编辑：Stephen23 2022-2-11

在 MATLAB Online 中打开

P = 'absolute/relative path to the main directory';
S = dir(fullfile(P,'**','*.mat'));
for k = 1:numel(S)
    F = fullfile(S(k).folder,S(k).name);
    D = load(F);
    ... your code that processes the imported file data, accessing the fields of D
    ... for example: D.whateverFieldYOuNeed
end