How to check if a directory(folder) exists?

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Leonardo Wayne
Leonardo Wayne 2016-3-25
评论： linhtuptit 2023-11-15
I am trying to create folders using mkdir, but if I have already created that folder, how do I check that before creating it. a = mkdir(directorylocation,text1) returns 1 in variable a if the directorylocation\text1 is created and if the directory exists. What is the function or condition that checks whether directorylocation\text1 exists

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drummer
drummer 2018-10-20
well, I suppose you want to create if it doesn't exist, after checking... so you could do it like that:
if ~exist(yourFolder, 'dir')
mkdir(yourFolder)
end
It basically check if youFolder does not exist. If that's true, it creates youFolder.
Cheers.

更多回答（2 个）

Cosmo
Cosmo 2020-8-4
If you're using MATLAB R2017b or later, it's better to use isfolder rather than exist like so:
if not(isfolder(yourFolder))
mkdir(yourFolder)
end
  2 个评论
tjueterb
tjueterb 2020-8-11
编辑：tjueterb 2020-8-11
In case anyone else was wondering why this solution is better:
To check the existence of a file or folder, you also can use the isfolder or isfile functions. exist searches for files and folders on the search path, which can lead to unexpected results. isfolder and isfile search for files or folders only on the specified path or in the current folder, which can lead to clearer and faster results.
(copied from the exist documentation page)

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Stephen23
Stephen23 2016-3-25
编辑：Stephen23 2020-8-11
Use exist like this:
7==exist(name,'dir') % check if folder exists
or
7~=exist(name,'dir') % check if folder does NOT exist
To avoid searching the entire MATLAB Search Path use an absolute file/folder name:
https://www.mathworks.com/help/matlab/matlab_env/specify-file-names.html

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