Struct rand::distributions::Poisson

[+] Show declaration

pub struct Poisson { /* fields omitted */ }

[−] Expand description

The Poisson distribution Poisson(lambda).

This distribution has a density function: f(k) = lambda^k * exp(-lambda) / k! for k >= 0.

Example

use rand::distributions::{Poisson, Distribution};

let poi = Poisson::new(2.0);
let v = poi.sample(&mut rand::thread_rng());
println!("{} is from a Poisson(2) distribution", v);

Methods

impl Poisson

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pub fn new(lambda: f64) -> Poisson

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Construct a new Poisson with the given shape parameter lambda. Panics if lambda <= 0.

Trait Implementations

impl Clone for Poisson

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fn clone(&self) -> Poisson

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Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

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Performs copy-assignment from source.

impl Copy for Poisson

impl Debug for Poisson

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fn fmt(&self, f: &mut Formatter) -> Result

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Formats the value using the given formatter.

impl Distribution<u64> for Poisson

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fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> u64

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Generate a random value of T, using rng as the source of randomness.

Important traits for DistIter<'a, D, R, T>

impl<'a, D, R, T> Iterator for DistIter<'a, D, R, T> where
    D: Distribution<T>,
    R: Rng + 'a,  type Item = T;

fn sample_iter<'a, R>(&'a self, rng: &'a mut R) -> DistIter<'a, Self, R, T> where     Self: Sized,     R: Rng,

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Create an iterator that generates random values of T, using rng as the source of randomness.