Integration on XY Graph (Min and Max X Scale)

[edowker]

Forewarning: I'm fairly new to LabVIEW but still know the basic ins and outs...

I'm attempting to integrate under a curve and I need my program to set the range of the integration to the minimum and maximum of the x scale. I have a slider and numeric controls set up in an event structure that let the user decide the min and max of the X scale. How would I program the integration to adjust the range when the user changes the range?

Thank you!

[GerdW]

Hi edowker,

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@edowker wrote:

How would I program the integration to adjust the range when the user changes the range?

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By choosing the correct subset of your (plot) data using an ArraySubset function…

[edowker]

That makes sense...however I'm still a bit confused on how you would use the numeric integration function to read both the subarray x data as well as the y data from the XY graph. I'm sure there's a simple answer but I'm just not seeing it, so thank you for helping!

[Bob_Schor]

It makes a tremendous difference if your array consists of samples (equally-spaced Y values with a constant "dt" (or "dx") value between points along the X axis, or if it consists of a set of x-y pairs where both X and Y can vary independently.  You neither showed us your code, nor your data.

Suppose you didn't have a computer.  Further suppose you've never had a Calculus class, but did have a set of data points.  Is there a way, with pencil and paper, you could "integrate" these data?  Then that's your Algorithm, translate it into LabVIEW.  See GerdW's suggestion about isolating a "subset" of the data (which I assume is held in an Array) ...

Bob Schor