How to go through multiple subfolders for operation?

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Mr. 206
Mr. 206 2018-11-19
编辑： Stephen23 2021-4-26
I only can access into one folder and process the data inside that folder. My Code is like this
%Specifying file directory for Ignition delay time
IGNfolder = '/home/ali//Curve_Matching_vs_Moments/IDT/test/Test_rig';
% It checks whether the folder actually exists or not. Warning message to the user if not.
if ~isdir(IGNfolder)
errorMessage = sprintf('Error: The following folder is not found:\n%s', IGNfolder);
uiwait(warndlg(errorMessage));
return;
end
% To get all the files in that directory and with desired file name pattern.
Allfiles = dir(fullfile(IGNfolder, '*.txt'));
allData = [];
for k = 1:length(Allfiles)
initialFileName = Allfiles(k).name;
fullFileName = fullfile(IGNfolder, initialFileName);
.
.
.
end
If i have multiple such kind of folder (Test_rig), How can i access into them one after another ?
For better explaining if i have one folder named 'JSR' which contains subfolders name " '1', '2', '3', '4'......................., 'n' " .
N.B: There are other subfolders also, but i only need to access into subfolders named " '1', '2', '3', '4'......................., 'n' " .

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Stephen23
Stephen23 2018-11-19
编辑：Stephen23 2021-4-26
"For better explaining if i have one folder named 'JSR' which contains subfolders name '1', '2', '3', '4'......................., 'n' "
P = 'path to directory JSR';
S = dir(fullfile(P,'*'))
X = [S.isdir] & ~cellfun('isempty',regexp({S.name},'^\d+$','once'));
S = natsortfiles(S(X)); % optional: download from FEX.
for k = 1:numel(S)
F = fullfile(P,S(k).name) % path to subdirectory.
... your code
end
You can download natsortfiles here:
https://www.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort
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Stephen23
Stephen23 2018-11-19
编辑：Stephen23 2021-4-26
"It would great help, if you edit my code. "
Your code does not mention any folder with the name '1', '2', etc., so it is not clear how your code relates to your actual question, or my answer. Also I used dir to identify the subfolder names, so isdir is totally superfluous. Only you can decide if this is suitable for your workflow.
Perhaps this is what you want:
P = 'path to directory JSR';
S = dir(fullfile(P,'*'))
X = [S.isdir] & ~cellfun('isempty',regexp({S.name},'^\d+$','once'));
S = natsortfiles(S(X)); % optional: download from FEX.
for ii = 1:numel(S) % loop over each subfolder.
T = dir(fullfile(P,S(ii).name,'*.txt'));
for jj = 1:numel(T) % loop over each file.
F = fullfile(P,S(ii).name,T(jj).name);
... code processing file F.
end
end

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