Thanks Ruthber. I checked on it and what I can say is that it will definitely run on m-file script. But there's no instructions or procedures showing that this will work on Simulink especially for our Gizduino (Arduino clone) hardware? Thank you, again.
I think you are concerned that any of these methods might not work with the Arduino clone, but if the board you are using has the same bootloader and Pin configuration as Arduino then it would work for sure.
I have used both Arduino boards like Due, Uno and Arduino Clones like Freeduino(http://www.freeduino.org) with MATLAB/Simulink successfully.
If you have Matlab 2014 with Simulink or newer version, try following this link http://in.mathworks.com/hardware-support/arduino-matlab.html and download the Support package.
Else, try following this link http://playground.arduino.cc/interfacing/matlab which explains all methods.