Function statrs::function::gamma::gamma_li

pub fn gamma_li(a: f64, x: f64) -> f64

Computes the lower incomplete gamma function gamma(a,x) = int(exp(-t)t^(a-1), t=0..x) for a > 0, x > 0 where a is the argument for the gamma function and x is the upper integral limit.

Panics

if a or x are not in (0, +inf)