serial port connected to matlab

I am trying to receive data in MATLAB from a port connected to Arduino and a load cell, my system is programmed in a way that by entering the letter a in ARDUINO interface I receive 2 numbers with cama(,) in between. now in MATLAB I receive the same tow numbers by using the command [ fprint(s,'a'), fscanf(s)] respectfully, now I want to have this numbers as real numbers in MATLAB not only text, I'd appreciate any help