Calculate the Area Between Two Curves

Question

Allison Bushman 2019-3-5

0
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https://ww2.mathworks.cn/matlabcentral/answers/448355-calculate-the-area-between-two-curves

回答： Rik 2019-3-5

I am trying to calculate the area between these two curves:

cP6(k,:)=P6;
cP7(k,:)=P7;
plot(cP6(:,1),cP6(:,2),'LineWidth',2,'Color','red');
plot(cP7(:,1),cP7(:,2),'LineWidth',2,'Color','blue');

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Answer 1

Rik 2019-3-5

1
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https://ww2.mathworks.cn/matlabcentral/answers/448355-calculate-the-area-between-two-curves#answer_363914

在 MATLAB Online 中打开

This code should help. It assumes you want to count all the area between the two lines as positive. The more crossings there are, the more this code will give an overestimation.

cP6(k,:)=P6;
cP7(k,:)=P7;
x1=cP6(:,1);
y1=cP6(:,2);
%x2=cP7(:,1);
y2=cP7(:,2);
%if x1 and x2 are not the same, you will need to resample them,
%or use polyarea instead of trapz
A=trapz(x1,abs(y1-y2));