Loop to calculate area under curve using rectangle methode

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Andre on 18 Apr 2018
Answered: Akira Agata on 23 Apr 2018
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
Andre on 19 Apr 2018
Actually, I have a research about the rectangular method, that's why

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Answers (1)

Akira Agata
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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