Wow, you're determined to stick to a text based programming language even inside a LabVIEW block diagram!
I'm not sure your VI is working the way you want it to. There is nothing slowing down the while loop. It will loop as fast as the CPU can handle.
The timing primitives on your block diagram are just giving a millisecond timer value, they aren't providing any periodic timing.
Your formula node is supplying 1 value pair at a time, these pairs need to be collected somehow. When the XY graph is placed on the the block diagram a "Build XY Graph" express VI is also added to collect the XY data points for you, otherwise you will only ever see a single value pair. The bit that isn't obvious is that you need to wire the "reset" input to the "Build XY Graph" express VI. Otherwise its default value is True and it resets at every iteration and you only ever see one value.
There is a "First Call?" primitive you can use to reset the Build XY Graph VI once at the start and then switch over to collecting data.
I've also added a "Wait millisecond multiple" inside loop to slow it down and give you consistently timed data points. Without it you will get countess millions of unpredictably timed data points a second.
I think this will get you to the next step.
Troy - CLD
"If a hammer is the only tool you have, everything starts to look like a nail." ~ Maslow/Kaplan - Law of the instrument
