How to pick files from sub-folder

2021 2 25
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更新时间：2022 7 9
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I have two sub-folders with images and require to perform operations using them. When i am running the code with sub-folder in the current folder window its being executed but i need to extract them from the main folder and run them. Also the ouput is a text file, which needs to be present in respective sub-folders instead of the current folder window. Please help me with these issues. Thank you in advance.

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Bob Thompson
Bob Thompson 2021-2-25

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I recommend using dir to capture all the contents of your parent folder within a variable. Then you can use the contents of that variable to specify which child folder you want to work in.
folders = dir('parent folder path'); % Captures all contents of parent folder
folders = folders([folders(:).isdir]==1); % Filter to just folders
folders = folders(3:end); % Remove unnecessary '.' and '..' directories
for i = 1:length(folders)
path = [folders(i).folder,'\',folders(i).name];
% do work with path variable directing to each child folder.
end

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Aishwarya Sanaka
Aishwarya Sanaka 2021-2-25
Hi Bob, Thanks for responding. I am sorry for not clearly presenting my problem but your suggestion is already working in my code.The code is working when the images and the program are in the folder but when the program file is present in the window. Matlab is not able to read images from the folder. So i want to knwo if that problem can be solved. I have attached the screenshots so that it is better to understand.
Bob Thompson
Bob Thompson 2021-2-25
Hmm, I'm not sure I understand. MATLAB is capable of finding .jpg files in any directory it's shown to. Knowning that I don't understand the problem, here are some thoughts:
  • Are you receiving a specific error message?
  • Are you capturing the files within the subfolders, not just the contents of the parent folder?
Aishwarya Sanaka
Aishwarya Sanaka 2021-2-26
Hey Bob, I am sorry have figured that your suggestion works and the problem has been solved. Yes the files within subfolders are being captured this has been solved by using 'genpath'. My bad for the confusion. Thanks again!
Hey@Bob Thompson, I tried following your suggestion for my code and got the following error. I want
Dot indexing is not supported for variables of this type.
For me, my main folder has 70 subfolders. Each of the sub folders have 4 files.
Bob Thompson
Bob Thompson 2022-7-9
Please share more of your code. From what I posted here, the error indicates that somehow 'folders' is not a structure class, but without knowing more about where the error is occurring in your work, I can't say if that's actually the problem.

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