https://github.com/krtab/rand-array-iid

A rust crate to create arrays whose elements are independently identically distributed.
https://github.com/krtab/rand-array-iid

Last synced: about 1 year ago
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A rust crate to create arrays whose elements are independently identically distributed.

• Host: GitHub
• URL: https://github.com/krtab/rand-array-iid
• Owner: krtab
• License: mit
• Created: 2020-10-05T17:23:28.000Z (over 5 years ago)
• Default Branch: main
• Last Pushed: 2020-10-14T21:01:26.000Z (over 5 years ago)
• Last Synced: 2025-04-02T05:52:31.323Z (about 1 year ago)
• Language: Rust
• Homepage:
• Size: 23.4 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: Readme.md
  • Changelog: CHANGELOG.md
  • License: LICENSE.txt

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README

          
# Rand-array-iid

[![Build Status](https://img.shields.io/travis/krtab/rand-array-iid/main?style=flat-square)](https://travis-ci.org/krtab/rand-array-iid)

[![Crates.io](https://img.shields.io/crates/v/rand-array-iid?style=flat-square)](https://crates.io/crates/rand-array-iid)

[![Docs](https://img.shields.io/badge/docs-doc.rs-blue?style=flat-square)](https://docs.rs/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

```rust

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

```rust

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:

```rust

use rand_distr::Distribution;

use rand::Rng;

fn sample_iid(dist: D, rng: &mut R, n: usize) -> Col

where

    R: Rng + ?Sized,

    Col: std::iter::IntoIterator,

    Col: std::iter::FromIterator<::Item>,

    D: Distribution<::Item>,

{

    dist.sample_iter(rng).take(n).collect()

}

```