Getting area of selected area plot?
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Is it possible to calculate the area selected with the area plot (example attached)?
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/162425/image.png)
Working with area plots allows to visually confirm how accurate my selection of points are, but I don't know how to get the filled area. I know that trapz is used for data under curve calculations, but my values are negative, plus I cannot see the exact data calculated with trapz, so I cannot confirm if I use it as I think I am.
---edit
Does this do the job?
trapz(selectedArea.YData, selectedArea.YData)
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Star Strider
il 25 Apr 2016
That won’t, but this might:
sel_area = trapz(selectedArea.XData, selectedArea.YData);
assuming of course that ‘selectedArea.XData’ exists.
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Star Strider
il 26 Apr 2016
My pleasure.
I’m not certain what you’re asking. The area plotted with area should reflect what trapz calculated, however I have no idea how you would verify that. (One possibility might be the polyarea function.) Also, see if the related cumtrapz function will do what you want.
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