close(ftpobj) closes the connection to the FTP server.
If you do not run close at the end of your session, the connection either times out automatically or terminates when you exit MATLAB®.
After calling close, calling any other FTP method on the same object automatically reopens the connection.
close does not return any output to indicate success or failure.
FTP object created by ftp.
Connect to the MathWorks® FTP server, and then disconnect: