Matlab is only supported in Phidget21, so make sure you install that instead of Phidget22. You can find the drivers here
You can download our sample code here
, which will show you how to get data from the Phidget into your Matlab program. Once you get that working, I would look for a general guide on how to display graphs in Matlab (like this
). Then combine the two pieces of code to get live data graphing from your Phidget.