Crate exponential_integral

The exponential integral, often written $\text{Ei}$, equal to the the integral of an exponentiated input over the input itself: $\text{Ei}(t) = \int_{-\infty}^{t} \frac{ e^{u} }{ u } \text{d}u$

Inspired by GSL’s implementation.

Modules

chebyshev

Chebyshev series/polynomial approximation.

neg

Inputs less than 0.

pos

Inputs greater than 0.

Structs

Approx

An approximate value alongside an estimate of its own approximation error.

Enums

Error

An approximate value alongside an estimate of its own approximation error.

Functions

E1

Original C code

Ei

Original C code