How do I read Folders with subfolders ?

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Chidiebere Ike 2018-5-17

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https://ww2.mathworks.cn/matlabcentral/answers/401204-how-do-i-read-folders-with-subfolders

编辑： Image Analyst 2019-4-21

I have a folder named "Yale" with subfolder named "YaleB01" to "YaleB21" in MATLAB directory. Each subfolder contains images. How can I read all of them ("YaleB01" to "YaleB21") & show them in different windows i.e. X number of windows for Y number of images. I am new to MATLAB & need your guide. Can somebody help me on this?

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Image Analyst 2018-5-17

I did guide you. Did you overlook my code demo below? Scroll down.

Chidiebere Ike 2018-5-17

Oh sorry, Just noticed that now. Thanks so much

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Answer 1

Image Analyst 2018-5-17

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If you have R2016b or later, use ** in dir(). See attached examples.

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Answer 2

Paolo 2018-5-17

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在 MATLAB Online 中打开

There are many ways you can do this. One way is the following:

%Find all images in subfolders with .jpg extension.
image_files = dir ('**/*.jpg');
%Expression for only folders of interest.
expression = '(Yale).(\d+)';
for i=1:length(image_files)
      %Check for correct directory.
      if(~isempty(regexp(image_files(i).folder,expression)))
          figure;
          path = strcat(image_files(i).folder,'\',image_files(i).name);
          image = imread(path);
          imshow(image);
      end
  end

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Answer 3

Ba Mo 2019-4-21

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编辑：Image Analyst 2019-4-21

在 MATLAB Online 中打开

As lots of users reported above, new versions of matlab support the following command dir('**/*.mat');

However, old versions of matlab don't support this.

Instead of writing a large code, inspect the structure field "isfield" and so on, you could just easily ask DOS (or the command prompt) to do it for you. The output from MS-DOS isn't formatted, so you will need to split the one block string to separate lines

newline = char(10); % char(10) is the character for line-break, or "enter"
[~,all_mats] = system('dir /s /b *.*'); % you can also simply write: !dir /s /b *.mat
all_mats = strsplit(all_mats,newline)';
all_mats(cellfun(@isempty,all_mats))=[]; % the last entry/line might be an empty cell. delete it.