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I don't want to use something like serial ('COM2') to read data from Arduino by Matlab.

Is there any way in Matlab to identify COM port of an Arduino board automatically?

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You can use the arduino command (from the MATLAB Support Package for Arduino Hardware) without any arguments:

recreates the last successful connection to the Arduino® hardware. If that connection fails, it creates a connection to the first official Arduino hardware connected to your host computer via USB.

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