Struct rand::distributions::Exp

pub struct Exp { /* fields omitted */ }

The exponential distribution Exp(lambda).

This distribution has density function: f(x) = lambda * exp(-lambda * x) for x > 0.

Example

use rand::distributions::{Exp, IndependentSample};

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

Methods

impl Exp

pub fn new(lambda: f64) -> Exp

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

Trait Implementations

impl Debug for Exp

fn fmt(&self, __arg_0: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl Copy for Exp

impl IndependentSample<f64> for Exp

fn ind_sample<R>(&self, rng: &mut R) -> f64 where
    R: Rng, 

Generate a random value.

impl Clone for Exp

fn clone(&self) -> Exp

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Sample<f64> for Exp

fn sample<R>(&mut self, rng: &mut R) -> f64 where
    R: Rng, 

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