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

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scully2014
scully2014 2018-10-7
评论： Image Analyst 2018-10-7
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?

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回答（2 个）

Image Analyst
Image Analyst 2018-10-7
Use dir(). See attached example.
  1 个评论
Image Analyst
Image Analyst 2018-10-7
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

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Stephen23
Stephen23 2018-10-7
编辑：Stephen23 2018-10-7
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

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