How to calculate Area under a curve

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Ahmed
Ahmed 2019-12-19
回答： Elnaz Ensafi 2020-7-31
Hello All,
I am trying to calculate shaded area of my x and y data given in the excel sheet. I am using the following code which calculates the entire area, but I want to subtract the un-shaded area from.
x = xlsread('filename','A:A');
y = xlsread('filename','B:B')
Integral = trapz(x,y);
area(x, y);
;
Is there anyone help me with the correct code please ?. Your response will be appreciated too much.

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采纳的回答

Star Strider
Star Strider 2019-12-19
Try this to get the integral only between 20 and 40:
lims = (x >= 20) & (x <= 40);
Integral = trapz(x(lims),y(lims));

更多回答（1 个）

Elnaz Ensafi
Elnaz Ensafi 2020-7-31
I have plot that I extracted from EEG data. I would like to extract area under the curve from 25 ms to 275 ms. could you Please help me in this case?

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