How to count how many sub folders under a folder

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Jason
Jason 2016-3-4
编辑： Stephen23 2023-11-24
In a folder, there are many sub folder, how do we count how many sub folder they are?
  1 个评论
Stephen23
Stephen23 2016-3-4
编辑：Stephen23 2022-9-3
Note that KSSV's answer actually counts the total contents of a folder, including any files.
See also:
https://www.mathworks.com/matlabcentral/answers/484430-using-struct-dir-selpath-what-do-and-mean-as-struct-name#answer_395754
https://www.mathworks.com/matlabcentral/answers/40949-omitting-pointers-when-listing-folder-contents#answer_50568
https://www.mathworks.com/matlabcentral/answers/13978-list-of-files-sorting#answer_19278
As Walter Roberson wrote in that last link: "In short: if your code assumes that '.' and '..' are the first two entries in a directory, your code has a bug (even in MS Windows). If your code assumes that directory entries are returned in any sorted order, your code has a bug (in all OS.)"

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回答（2 个）

KSSV
KSSV 2016-3-4
go the folder...and use
k = dir ;
N = length(k)-2 ;
N should be the number of sub folders.
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Jason
Jason 2016-3-4
Thank you. But his solution work pretty well for me. I just want to check how many items their, I do not care if it is directory or not.
Thomas Carter
Thomas Carter 2022-3-13
This answer also includes any files. So I don't think it is the answer

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Stephen23
Stephen23 2022-3-14
The correct answer would be something like this:
P = 'absolute or relative path to the folder';
S = dir(P);
N = nnz(~ismember({S.name},{'.','..'})&[S.isdir])

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