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Integrating values between cusors

Hello All,
I am trying to intergrate the values of an array that lies between two cursors on a dynamically updataing XY plot. When I use a property node to get the cursor index, the leftmost point on the plot is 0 as expected, but the very next point on the right has a value like 86325. I have no idea what is happening. Can someone point out what is wrong here?
What I want to do is have a xy plots, allow the user to drag the cursor to the required point on the plot and display the sum of the array contained within the plot.
Thanks.
KB
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Hi Grass,
if you look in the history of this posting, you will find someone, last week how developped exactly what you want to do.

Doc-Doc
Doc-Doc
http://www.machinevision.ch
http://visionindustrielle.ch
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