Function pois_pmf 

pub fn pois_pmf(x: i32, lambda: f64) -> f64

Computes probability mass function (pmf) for X ~ Pois(lambda).

Parameters

• lambda > 0

Support

• x = 0,1,2,...

Example

Suppose X ~ Pois(lambda=2.5). To compute P(X = 4), use

use ruststat::pois_pmf;
println!("P(X=x): {}", pois_pmf(4, 2.5));