Calculate area under every point in a graph

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Debbie Oomen
Debbie Oomen 2017-10-11
回答： Cam Salzberger 2017-10-11
I want to calculate the area under every point in EMG graphs. I have used the script: Int = trapz (x,y); however this calculates the entire area under the graph instead of the area under every point. What would be the script for this?
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KSSV
KSSV 2017-10-11
How you will get area under a point? To get area at least you need two points...

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Cam Salzberger
Cam Salzberger 2017-10-11
Hello Debbie,
I am assuming that you mean "area under a segment between two points" since, as KSSV says, you can't have an area under a single point. In this case, assuming you know that you want the area of the "ith" line segment (between the "ith" and the "(i+1)th" points), you can just do:
val = trapz(x(i:i+1), y(i:i+1));
If you simply want the height of a point, rather than the area, then it's just y(i).
-Cam

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