![]() There have been a number of approximations for the exponential integral function. ![]() However, integrating an arbitrary continuous function in Excel is not one of the built-in function. The built-in library of mathematical functions cover many of the needs in day-to-day design task. Microsoft Excel is a very powerful tool for a surprising range of applications. Integration in Excel using Gaussian Quadrature. Purpose of use: compare approximate function (my own) to tabulated data. Calculates the exponential integral Ei(x).
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