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hchanson
Joined: 29 Jan 2019 Posts: 1
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Posted: Tue Jan 29, 2019 11:42 pm Post subject: Volume Under Surface command |
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I am not sure to understand the "Volume Under Surface command " and the Help file. The help file for that command show a graph. Two result windows are shown for the same graph. Since it is the same curve, the total volume (above + below) should be the same irrespective of the specified Z. Is it not?
Thank you in advance for any hint, as the Help is very succint. |
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DPlotAdmin Site Admin
Joined: 24 Jun 2003 Posts: 2311 Location: Vicksburg, Mississippi
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Posted: Wed Jan 30, 2019 2:07 am Post subject: |
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Quote: | Since it is the same curve, the total volume (above + below) should be the same irrespective of the specified Z. Is it not? |
The short answer is "no". Imagine if the reference Z was, instead of -1, -100. The volume below will still be 0, The volume above is a large(r) number, which is correct.
It might help you to visualize this operation with a 2D curve and integrating it. The sum of the areas above and below some reference Y will NOT be the same for different reference Y's. _________________ Visualize Your Data
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