It is the classical Trapezoidal method in numerically integrating a given set of data. It is used in evaluating unequally-spaced (or even equally spaced) data points (of x).
Robby Ching (2020). Trapezoidal rule-data (https://www.mathworks.com/matlabcentral/fileexchange/77660-trapezoidal-rule-data), MATLAB Central File Exchange. Retrieved .
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