Area under a curve from a set of data points

Question

richard 2013-4-15

0
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https://ww2.mathworks.cn/matlabcentral/answers/72092-area-under-a-curve-from-a-set-of-data-points

Hello

I have a 'n x 8' matrix with with each column representing the radioactivity in a certain organ and the rows correspond to activity at a certain time (1-10 days)

so it goes like this

A = [1 2 3 4 5 6 7 8;........;........;

where the values represent the radioactivity in eight different organs. And there are a bunch of rows corresponding to the time elapsed and the activity at those times. Make sense??

I plotted this out and my next task is to find the area under each of the data points so I want 8 different values for the integral under each of the 8 organ curves. Any idea on how to do this?

I am looking at the help site, and all they give for examples are actual functions (ex. sin(x^2), e^(-x^2) etc.) In my case I only have sets of data points with no actual function fitted to them. Any help will be appreciated