How to get ONLY the data shown in the plot area (Chart)

My chart history length are 120000, often I don't need to save the whole
buffer, just the data shown in the plot area?
Richard Pettersen

Hi Richard,
you haven't said which version of LabVIEW you're using, so I've assumed 6.1, although this should be fine for older versions too.
I put down a chart with a scrollbar, so I could go through the old data, and put an indicator attached to the x-scale->Range->minimum and x-scale->Range->maximum. These followed the displayed elements in the chart as I scrolled through the data. You can therefore link in the chart history (history data property of the chart) with a array subset to retrieve the appropriate portion.
Be aware though. The minimum and maximum that the chart is showing on the x-scale may not be a part of the history data. E.g. if I set the history length to 1000 points, and produce on the first run, 1000 points, then my minimum and maximum are a
t say 899 and 999. I then produce a second set of data, 1000 points long, and my min and max move to 1899 and 1999. As my history data is only 1000 long, I can scroll back to 1000 OK, but my min and max used as indexes don't relate anymore. The array of data is from 0 to 999, but my indexes can run from 1000 to 1999. So I have to add in a check that sees how much data is available before attempting to index, and then it's down to the flow of the program to try to work out where the data actually is (I'll leave that one to you - you'll need to keep track of the history data compared to the maximum (shown just after a point is added though this then makes a mess of your data! - possible to keep a track of new minimum when adding new data : the maximum (which will show once new data goes on) minus the history length gives the minimum that can be scrolled to - subtract this from all max's and min's to get real offset into the data - history length can be got from the history data and an a
rray size sub .vi)
Obviously there's no problem if you're clearing the graph everytime you either plot new data, or reach maximum capacity on the history data as the indexes return to zero.
Hope that helps
S.
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How to get ONLY the data shown in the plot area (Chart)

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