Skip folders in a for loop

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Indrani 2023-6-28

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编辑： Stephen23 2023-6-28

Hi!

I have a month's folder (May) and data for the days in the subfolders as shown. I am using a for loop to read the data of the subfolders. How do I skip the dates 26, 27 and 28?

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Kanishk Singhal 2023-6-28

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You can get a list of files and folders(inside May) using dir function. You can then iterate over that.

If you want to create the folder name using vector you can use,

[13:25 29:31]

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Answer 1

Stephen23 2023-6-28

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编辑：Stephen23 2023-6-28

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"How do I skip the dates 26, 27 and 28?"

I would just use DIR to get a list of content in the parent folder. For example here is one approach:

P = '../../2018/May'; % absolute or relative path to where the parent folder is
S = [dir(fullfile(P,'1*'));dir(fullfile(P,'2*'));dir(fullfile(P,'3*'))];
S(~[S.isdir]) = []; % remove any files

The structure S contains a list of all subfolders in P with names starting with 1, 2, or 3. You can simply loop over that structure, e.g. the 2nd folder listed in S is:

S(2).name

or put all of the folder names into a cell array:

C = {S.name} % optional

Another approach is to use ISFOLDER:

for k = 1:31
    F = fullfile(P,sprintf('%02d',k));
    if isfolder(F)
        ... do whatever
    else
        ... do nothing
    end
end

Note that months also have varying lengths.

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Answer 2

Manas 2023-6-28

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Hi Indrani,

I am assuming that you are using the fullfile function in matlab to get the addressess of each folder. This function returns a character Vector which has the address of the folder. You can us the If-else statements to skip the folders with date 26,27 and 28.

for more info, you can check out the documentation:

Build full file name from parts - MATLAB fullfile - MathWorks India