Loop to calculate area under curve using rectangle methode
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Hello everyone I have a graph plotted in Matlab (no function), as data was imported via Excel, I am looking for a loop to calculate the area under the curve of each interval and then add them to get the entire area
Here's how my graph look like
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/189712/image.png)
2 Comments
Akira Agata
on 18 Apr 2018
How about using trapz function, instead of trying rectangle method. Or, do you have to try rectangle method for some reason?
Answers (1)
Akira Agata
on 23 Apr 2018
Sorry for my late response. Here is an simple example.
% Sample data
dx = pi/10;
x = 0:dx:2*pi;
y = 1+sin(x);
% integral of y = f(x) via trapezoidal method (S1) and rectangle method (S2)
S1 = trapz(x,y);
S2 = sum(y*dx);
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