Import text files from multiple folders

I am trying to import data from multiple text files spread out between multiple folders. In this example of a previous question, what could I do to grab data from every file in each folder, rather than just one particular file?

% Path of the main folder : Rotation
yourpath = 'H:\Inspection ProjectData\rotation1';
% Get all the subfolders
ContentInFold = dir(yourpath);
SubFold = ContentInFold([ContentInFold.isdir]); % keep only the directories
% Loop on each folder
MyData = [];
for i = 3:length(SubFold) % start at 3 to skip . and ..
  filetoread = fullfile(yourpath,SubFold(i).name,'fx.txt'); % <- this is the "fx.txt" file of the ith subfolders
  % then type your code to read the text files and store in one variable
  fileID = fopen(filetoread);
  MyData{end+1} = textscan(fileID,'%s\n'); % the format depends of your files
  fclose(fileID);
end

[Jan]

How are the files recognize, which you want to process? Do all files have the same name?

Answer 1

[Jan]

If all files are called "fx.txt" and you are using a Matlab version >= R2016b:

FileList = fullfile(yourpath, '**', 'fx.txt');
for iFile = 1:numel(FileList)
  filetoread  = fullfile(FileList(iFile).folder, FileList(iFile).name);
  ...
end

Note: It is not documented, that '.' and '..' are the first two folders replied by dir. This might change with the operating system and file system. Prefer a ismember(Name, {'.', '..'}.

[Nima Sho]

Hello Jan

Regarding the question discussed above, I have a main Folder, named 'Results', which contains 44 folders, named 1 to 44. Each of these 44, has 20 subFolders inside itself, named by some various numbers. In each of these 20, there are some txt files and I will use a specific one of them named 'drifts'.

By using above-mentioned txt files, I'll plot 44 curves, each one is made up of 20 points.

How can I address these txt files exist in multiple folders and then subfolders.

Thanks for your time and attention