MATLAB: Folder names in MATLAB project

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I downloaded some MATLAB project from the file exchange which consist of some m-files in the main directory and other m-files in several subdirectories.
The names of the folder in the projects are often starting with an "@" or a "+". Why is that? Further the appearance of the folders is different to folders which doesn't start with a special character. It seems as folders with "@" or "+" are added in the MATLAB path.
Is this the reason for naming the folders like that? Where can I find a documentation about that?
I'm looking forward to your answers!

Best Answer

Those are folders for MATLAB class files. Take a look at this documentation
Also the entire MATLAB object oriented programming guide
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