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How to calculate partial area-under-the-curve?

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M G
M G 2014-3-22
评论： Laura Kim 2019-5-27
Hi all,
I am trying to find the area under the curve (AUC) for a part of a graph. I use "trapz" function, but this function calculates the AUC for a entire area below the selected part of the graph. Any hint how I can calculate only part of it (not entire part until x-axis)? Please see figure. Interested are to be calculate is in red.
Thanks, Mehdi
(for simulation of data, just generate a random vector and try a part of it.)

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Mischa Kim
Mischa Kim 2014-3-22
Mehdi, use trapz twice to subtract the area below the red marked one (between x-axis and data points y = 0.3111, 0.1848 ) from the entire area.
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Mischa Kim
Mischa Kim 2014-3-22
This should do
trapz(data(221:224)) - trapz([221 224],[data(221) data(224)])
Laura Kim
Laura Kim 2019-5-27
Hi I was wondering if this method worked.
thank you

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