cb-digest 0.1.0

Optimised T-Digest algorithm in Rust
Documentation 
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# Optimised T-Digest algorithm in rust

Based on - [original](https://github.com/MnO2/t-digest)
This implementation is following Facebook folly's [implementation](https://github.com/facebook/folly/blob/master/folly/stats/TDigest.cpp)

## Installation

Add this to your `Cargo.toml`:

```toml
[dependencies]
cb-digest = "0.1"
```

then you are good to go. If you are using Rust 2015 you have to ``extern crate cb-digest`` to your crate root as well.

## Example

```rust
use cb_digest::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);
```