gradient/difference calculation

[Duran]

Hi All

I managed to display two input readings on an X-Y graph. I have one analogue voltage reading for my Y-axis and also counter input from my encoder for the X-axis. Now I am trying to calculate angle of change in anologue voltage reading with respect to counter reading. For this I am using inverse tangent of change in Y-axis divided by change in X-axis. My question is how can I dynamically  find the change in analogue and counter input values so that I can feed it into my formula VI to calculate the angle. I tried to use shift register but no success. Please find the attached VI. Any help is greatly appreciated.

Thanks

Duran

[RavensFan]

Try this.  It uses shift registers to get the old data from the last iteration with the new data just acquired.  I can't test it, and I don't usually use dynamic data types so it's possible the math operations won't work right.  But this should give you the idea.