Struct PoissonDistribution 

pub struct PoissonDistribution {
    pub lambda: f64,
}

Poisson distribution with parameter lambda.

Fields

lambda: f64

Implementations

impl PoissonDistribution

pub fn new(lambda: f64) -> Self

pub fn pmf(&self, k: usize) -> f64

P(N = k) = e^{-lambda} * lambda^k / k!

pub fn cdf(&self, k: usize) -> f64

P(N <= k)

pub fn mean(&self) -> f64

Expected value: lambda.

pub fn variance(&self) -> f64

Variance: lambda.

pub fn sample(&self, rng: &mut Rng) -> usize

Sample a Poisson random variable using the inverse transform method.