Hi,
It is pretty easy interfacing with matlab via the serial, i have tinker with it and its great but remember that matlab isnt that fast so if you send data to fast your matlab wont keep up with the streaming and you will see a delay in the data.
the serial interface is basically 2 pins, Rx and Tx ( receive and transmit) with which you send data using bits. all you need to set is the bound rate on both sides and the format of the transmitting data. the arduino will send the data via the serial each time you perform serial.print
i add the files i have used.
arduino_data_aquire.m (533 Bytes)
AnalogReadSerial.ino (680 Bytes)