How do I calculate areas under the curves above and below the x axis at 0?

The xy graph generated is similar to a sinusoidal representing the magnetic intensity of the poles of a motor. For each of the four areas above and below the x axis at 0 I would like to calculate the area then do a variance analysis on the 8 areas. Can anyone suggest a method to calculate each of the 8 areas. See the attached vi to understand better what I'm trying to do.
Thank you.
Attachments:
MIN MAX A.vi ‏16 KB

Hi all,
If you are simply looking to do numeric integration, there is built in functionality to do that.  The help file is here:
http://zone.ni.com/reference/en-XX/help/371361H-01/gmath/numeric_integration/
You will may have to do some edge checking if you want to break this down into individual components.
Let us know if you need any more assistance
Applications Engineer
National Instruments

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