[][src]Struct rand::distributions::Gamma

pub struct Gamma { /* fields omitted */ }
Deprecated since 0.7.0:

moved to rand_distr crate

The Gamma distribution Gamma(shape, scale) distribution.

The density function of this distribution is

f(x) =  x^(k - 1) * exp(-x / θ) / (Γ(k) * θ^k)

where Γ is the Gamma function, k is the shape and θ is the scale and both k and θ are strictly positive.

The algorithm used is that described by Marsaglia & Tsang 20001, falling back to directly sampling from an Exponential for shape == 1, and using the boosting technique described in that paper for shape < 1.


  1. George Marsaglia and Wai Wan Tsang. 2000. "A Simple Method for Generating Gamma Variables" ACM Trans. Math. Softw. 26, 3 (September 2000), 363-372. DOI:10.1145/358407.358414 

Methods

impl Gamma[src]

pub fn new(shape: f64, scale: f64) -> Gamma[src]

Construct an object representing the Gamma(shape, scale) distribution.

Panics if shape <= 0 or scale <= 0.

Trait Implementations

impl Distribution<f64> for Gamma[src]

Important traits for DistIter<D, R, T>
fn sample_iter<R>(self, rng: R) -> DistIter<Self, R, T> where
    R: Rng,
    Self: Sized
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Create an iterator that generates random values of T, using rng as the source of randomness. Read more

impl Copy for Gamma[src]

impl Clone for Gamma[src]

fn clone_from(&mut self, source: &Self)1.0.0[src]

Performs copy-assignment from source. Read more

impl Debug for Gamma[src]

Auto Trait Implementations

impl Unpin for Gamma

impl Sync for Gamma

impl Send for Gamma

impl UnwindSafe for Gamma

impl RefUnwindSafe for Gamma

Blanket Implementations

impl<T> ToOwned for T where
    T: Clone
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type Owned = T

The resulting type after obtaining ownership.

impl<T> From<T> for T[src]

impl<T, U> Into<U> for T where
    U: From<T>, 
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impl<T, U> TryFrom<U> for T where
    U: Into<T>, 
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type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> Any for T where
    T: 'static + ?Sized
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impl<V, T> VZip<V> for T where
    V: MultiLane<T>, 
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