3 unstable releases
0.2.0 | Oct 14, 2020 |
---|---|
0.1.1 | Oct 13, 2020 |
0.1.0 | Oct 6, 2020 |
#4 in #arr
12KB
122 lines
Rand-array-iid
A rust crate to create arrays whose elements are independently identically distributed.
Install
[dependencies]
rand-array-iid = "0.1.0"
Examples
An array of normally distributed scalars
use rand_array_iid::IIDDistr;
use rand_distr::Distribution;
use rand_distr::StandardNormal;
let distr = IIDDistr::new(StandardNormal);
let mut rng = rand::thread_rng();
// Each of x element is distributed according to StandardNormal.
let x : [f64; 10] = distr.sample(&mut rng);
An array of 3D vectors sampled from the unit sphere
use rand_array_iid::IIDDistr;
use rand_distr::Distribution;
use rand_distr::UnitSphere;
let distr = IIDDistr::new(UnitSphere);
let mut rng = rand::thread_rng();
// Each of x element is sampled uniformly from the surface of the 3D unit sphere.
let x : [[f64; 3]; 10] = distr.sample(&mut rng);
Why only arrays?
Collections such as Vec
that implement std::iter::FromIterator
bear
no information on their size in their type, hence the distribution would have
to be restricted to a given size. They can also be sampled as follow:
use rand_distr::Distribution;
use rand::Rng;
fn sample_iid<D,R, Col>(dist: D, rng: &mut R, n: usize) -> Col
where
R: Rng + ?Sized,
Col: std::iter::IntoIterator,
Col: std::iter::FromIterator<<Col as std::iter::IntoIterator>::Item>,
D: Distribution<<Col as std::iter::IntoIterator>::Item>,
{
dist.sample_iter(rng).take(n).collect()
}
Dependencies
~1.5MB
~26K SLoC