Calculate area under every point in a graph

Question

Debbie Oomen 2017-10-11

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/360754-calculate-area-under-every-point-in-a-graph

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?

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

KSSV 2017-10-11

How you will get area under a point? To get area at least you need two points...

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Cam Salzberger 2017-10-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/360754-calculate-area-under-every-point-in-a-graph#answer_285272

在 MATLAB Online 中打开

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