How to know when the voltage is over the X-axis

I want to know if I can know when a voltage or current or any data pass the X-axis?
I have 2 type of data, Current and Voltage, and I want to know which one will cross the X-axis first, can some one help me on that?
Because with that I will know if my system is inductive or capacitive.
Thanks

Have a look at the code snippet.  The code can probably be improved using a For Loop, but this one should give you an idea of how to implement the solution.
I did not know the order of your data, so I called it top & bottom.   It will also look for crossing the X-axis at the same time.
If values are increasing instead of decaying, then swap the Less or Equal to Greater than or Equal, and swap the less than to greater than.  I think you'll get the picture.
Message Edited by Ray.R on 03-17-2010 09:28 AM
Attachments:
crossesXaxis.png ‏25 KB

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