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expint

Exponential integral

Syntax

`Y = expint(X)`

Description

`Y = expint(X)` evaluates the exponential integral for each element of `X`.

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Exponential Integral

The exponential integral computed by this function is defined as

Another common definition of the exponential integral function is the Cauchy principal value integral

which, for real positive x, is related to `expint` as

`${E}_{1}\left(-x\right)=-\text{Ei}\left(x\right)-i\pi$`

Tall Array Support

This function fully supports tall arrays. For more information, see Tall Arrays.

References

[1] Abramowitz, M. and I. A. Stegun. Handbook of Mathematical Functions. Chapter 5, New York: Dover Publications, 1965.