It is based on the Gauss-Quadrature rule. There are 5 choices: 2-point, 3-point, 4-point, 5-point and 6-point Gauss-Legendre equation. They are all used in numerically integrating a given function
Robby Ching (2020). Gauss-Legendre Equations for Integration (https://www.mathworks.com/matlabcentral/fileexchange/77669-gauss-legendre-equations-for-integration), MATLAB Central File Exchange. Retrieved .
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