Trapezoidal rule with unevenly spaced data points

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I am having a lot of trouble using the trapezoidal method on matlab to determine the area under the curve with no function, just unevenly spaced data points:
(0,0), (1,5), (5,8), (9,6), (3,10), (0,11)
I have absolutely no idea where to start.
Walter Roberson
Walter Roberson on 22 Sep 2022
You can decompose into shapes. There is an initial triangle, and you can get the area for that as 1/2 base times height. There are then a series of trapazoids, and you can calculate their areas. Then there is a final triangle and 1/2 base times height for it. Add the areas all together.
... which is what trapz() will do for you.

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Answers (1)

Matt J
Matt J on 22 Sep 2022
See trapz.




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