Read files from multiple folders

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Turbulence Analysis
编辑： Image Analyst 2022-4-13
Hi,
Lets say I have some 100 .dat files in each subfolder A, B , C , D that is placed inside the folder named Data. Here, I would like to perform operation in a one go, rather than running sperately for each subfolder. Is there a way to do this, does it requires parallel processing for this task ??
For e.g.
read data from subfolder A
for i = 1:1:100
some operation
end
read data from subfolder B
for i = 1:1:100
some operation
end

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Image Analyst
Image Analyst 2022-4-13
Use a fileDatastore:
topLevelFolder = pwd; % folder in which your images exists
filePattern = fullfile(topLevelFolder, '*.dat');
ds = fileDatastore(filePattern, 'ReadFcn', @readmatrix) % Creates a datastore for all images in your folder
allFileNames = {ds.Files{:}}'
for k = 1 : numel(allFileNames)
thisFileName = allFileNames{k};
fprintf('Processing %s.\n', thisFileName);
% Do something with it.
end
If you have the Parallel Processing Toolbox you can use parfor instead of for.
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Image Analyst
Image Analyst 2022-4-13
编辑：Image Analyst 2022-4-13
You must have a version older than r2019a. Just use csvread instead of readmatrix and it should work, as long as you have a version later than 2016a.
ds = fileDatastore(filePattern, 'ReadFcn', @csvread);
Or you can also try it with dir using two stars.
topLevelFolder = pwd; % folder in which your data files exist.
filePattern = fullfile(topLevelFolder, '**\*.dat');
fileList = dir(filePattern);
allFileNames = fullfile({fileList.folder}, {fileList.name})
for k = 1 : numel(allFileNames)
thisFileName = allFileNames{k};
fprintf('Processing %s.\n', thisFileName);
% Do stuff with the file, like read the data and process it somehow.
end
Turbulence Analysis
Turbulence Analysis 2022-4-13
It's working perfectly with two stars !!

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