For loop to work on files in subfolders, while skipping the first file

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Monalisa Chikezie
评论： Monalisa Chikezie 2022-8-5
I want todecode my data with tdt on MATLAB. I have a folder, this folder has 70 sub-folders. Each of the 70 sub-folders has four .mat files. I want to work on the 2nd three files while loading the first spm.mat file separately. How do I write a for loop that runs through these files so that after working on the loading the first file, I can work on each of the other 3 files sequentially then move to the next folder. These 3 files start with the letters voi (e g voi 1, voi 2). I used the folowing and got an error message: Dot indexing is not supported for variables of this type.
folders = dir('parent folder path'); % Captures all contents of parent folder
folders = folders([folders(:).isdir]==1); % Filter to just folders
folders = folders(3:end); % Remove unnecessary '.' and '..' directories
for i = 1:length(folders)
path = [folders(i).folder,'\',folders(i).name]; % do work with path variable directing to each child folder.
end
end
  2 个评论
Stephen23
Stephen23 2022-7-9
folders = folders(3:end); % Does NOT remove '.' and '..' directories
https://www.mathworks.com/matlabcentral/answers/1699230-folder-listing-with-dir-on-mac#answer_945260
https://www.mathworks.com/matlabcentral/answers/484430-using-struct-dir-selpath-what-do-and-mean-as-struct-name#answer_395754
https://www.mathworks.com/matlabcentral/answers/345841-unexplained-error-on-dir#answer_271627
https://www.mathworks.com/matlabcentral/answers/21150-function-call#comment_46042
https://www.mathworks.com/matlabcentral/answers/394807-create-text-file-containing-list-of-file-names#comment_556641
https://www.mathworks.com/matlabcentral/answers/288815-gui-for-loop-not-working-correctly#answer_224956
https://www.mathworks.com/matlabcentral/answers/40949-omitting-pointers-when-listing-folder-contents#answer_50568
https://www.mathworks.com/matlabcentral/answers/13978-list-of-files-sorting#answer_19278
As Walter Roberson wrote in that last link: "In short: if your code assumes that '.' and '..' are the first two entries in a directory, your code has a bug (even in MS Windows). If your code assumes that directory entries are returned in any sorted order, your code has a bug (in all OS.)"

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Image Analyst
Image Analyst 2022-7-9
Here's one way:
topLevelFolder = pwd; % Wherever you want.
filePattern = fullfile(topLevelFolder, '**/*.*');
folders = dir(filePattern); % Captures all contents of parent folder and subfolders
% Filter to just folders
itsAFolder = [folders.isdir]
folders = folders(itsAFolder);
% Get all folder names in a cell array.
folderNames = {folders.folder, folders.name}'
c = contains(folderNames, topLevelFolder)
folderNames = unique(folderNames(c))
% Loop over each folder and subfolder.
for k = 1:length(folderNames)
thisFolder = folderNames{k};
fprintf('Processing folder : "%s".\n', thisFolder)
% do work with path variable directing to each child folder.
end
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