How to use for loop to read one file in multiple folders?

I currently have a folder with 365 subfolders in it. Named Day_1, Day_2,....Day365. In each subfolder, there is a file named temp.txt. I want to read this file and extract data from all the subfolders. I can't figure out how to successfully do this with a loop. Any suggestions?

Answer 1

[Image Analyst]

Use dir(). See attached example.

[Image Analyst]

You haven't arrived at a solution yet? Alright, here is a simple example:

% Get a list of all files named temp.txt
% in the current folder or folders below it.
files = dir('**/temp.txt')  % R2016b or later only
for k = 1 : length(files)
  % Get the filename.
  fullFileName = fullfile(files(k).folder, files(k).name)
  thisData = importdata(fullFileName); % Read it in with some function.
  % Now do something with thisData.  Analyze it.
end

Answer 2

[Stephen23]

This should get you started:

D = 'directory where the subfolders are stored';
C = cell(1,365);
for k = 1:365
     F = sprintf('Day_%d',k);
     C{k} = csvread(fullfile(D,F,'temp.txt'));
end

Change csvread to an appropriate function that reads your text file. Read more:

https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html