random_grouping

Utility for random grouping.

The author of this crate is not good at English.
Forgive me if the document is hard to read.

What is this?

This is useful for grouping multiple items into some groups at random.

Examples

let mut rg = RandomGrouping::new();
let samples = (0..10).collect::<Vec<_>>();
let ratios = [0.3, 0.3, 0.2];

let result = rg.divide_by_ratio(&samples, &ratios);

assert!(result.len() == ratios.len());
for i in 0..result.len() {
    let group_size = (ratios[i] * samples.len() as f64).floor() as usize;
    assert!(result[i].len() == group_size);
    assert!(result[i].iter().all(|x| samples.contains(x)));
}

What's New

Version 0.2 has the following changes.

• The default value of stable has been changed to true from false.
• The first argument of divide_by_size and divide_by_ratio is changed to IntoIterator from slice.
• Instead, divide_slice_by_size and divide_slice_by_ratio are introduced (which are faster for slices).