This implementation is following Facebook folly's implementation
Add this to your Cargo.toml:
[dependencies]
tdigest = "0.2"then you are good to go. If you are using Rust 2015 you have to extern crate tdigest to your crate root as well.
use tdigest::TDigest;
let t = TDigest::new_with_size(100);
let values: Vec<f64> = (1..=1_000_000).map(f64::from).collect();
let t = t.merge_sorted(values);
let ans = t.estimate_quantile(0.99);
let expected: f64 = 990_000.0;
let percentage: f64 = (expected - ans).abs() / expected;
assert!(percentage < 0.01);
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