Loop to calculate area under curve using rectangle methode

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Andre
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
  2 Comments
Andre
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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