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Is "polyarea" the same as "trapz" for calculating area under the curve?

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J K
J K 2013-4-10
回答： Veronica Maria Rodriguez Betancourtt 2023-1-28
to find the area of enclosed polygon (or any shape), which works best? polyarea or trapz?
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J K
J K 2013-4-10
my prof gave us hint, to calculate the area enclosed, you need to take to forward area subtracted by the backward area. And it is under "trapz"
can you write the code for that?
J K
J K 2013-4-10
my problem is similar to this. http://www.mathworks.com/matlabcentral/newsreader/view_thread/300254
But I don't understand the 'idx' term. the_area = trapz(x(1:idx),y(1:idx))-trapz(x((idx+1):end),y((idx+1):end)
Plz help

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回答（1 个）

Veronica Maria Rodriguez Betancourtt
According to ChatGPT, polyarea uses the Shoelace Theorem.

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