I think what you are looking for can be found here:

http://se.mathworks.com/help/matlab/creating_guis/automatically-refresh-plot-in-a-guide-gui.html

I hope the link of the following article can help you

http://www.mathworks.com/matlabcentral/fileexchange/25519-collect-and-plot-data-from-an-instrument-in-real-time

If you just want to see the plot you can use Serial chart

https://code.google.com/p/serialchart/

Hi,

these simple tutorials can be helpful:

https://www.youtube.com/watch?v=udIyzonx9-A

https://www.youtube.com/watch?v=ntHZsLmNkgw

Best Regards

Thank you all for responses.