Integration of numerical data

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Emil Frøen on 26 May 2019

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Commented: Abdul Basith Ashraf on 31 Aug 2020

I have a set of numerical data stored in a vector D, and a second vector of positions z, of equal length.

If i wish to calculate the integral shown in the picture, how would this be done?

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John D'Errico on 27 May 2019

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Multiply the two vectors. Then call trapz.

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Star Strider on 27 May 2019

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For vectors of data, the best option would be the trapz (link) or the related cumtrapz functions, depending on the result you want.

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Abdul Basith Ashraf on 31 Aug 2020

I have not so regular data (x and y are returned from ode45).

How can I visualize the rectangles under the curve to see how good trapz is doing?

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