58 lines
1.8 KiB
Rust
58 lines
1.8 KiB
Rust
#![cfg_attr(feature = "cargo-clippy", allow(float_cmp, map_clone))]
|
|
|
|
#[macro_use] extern crate average;
|
|
|
|
extern crate core;
|
|
|
|
use core::iter::Iterator;
|
|
|
|
use average::{Skewness, Estimate, Merge};
|
|
|
|
#[test]
|
|
fn trivial() {
|
|
let mut a = Skewness::new();
|
|
assert_eq!(a.len(), 0);
|
|
a.add(1.0);
|
|
assert_eq!(a.mean(), 1.0);
|
|
assert_eq!(a.len(), 1);
|
|
assert_eq!(a.sample_variance(), 0.0);
|
|
assert_eq!(a.population_variance(), 0.0);
|
|
assert_eq!(a.error_mean(), 0.0);
|
|
assert_eq!(a.skewness(), 0.0);
|
|
a.add(1.0);
|
|
assert_eq!(a.mean(), 1.0);
|
|
assert_eq!(a.len(), 2);
|
|
assert_eq!(a.sample_variance(), 0.0);
|
|
assert_eq!(a.population_variance(), 0.0);
|
|
assert_eq!(a.error_mean(), 0.0);
|
|
assert_eq!(a.skewness(), 0.0);
|
|
}
|
|
|
|
#[test]
|
|
fn simple() {
|
|
let mut a: Skewness = (1..6).map(f64::from).collect();
|
|
assert_eq!(a.mean(), 3.0);
|
|
assert_eq!(a.len(), 5);
|
|
assert_eq!(a.sample_variance(), 2.5);
|
|
assert_almost_eq!(a.error_mean(), f64::sqrt(0.5), 1e-16);
|
|
assert_eq!(a.skewness(), 0.0);
|
|
a.add(1.0);
|
|
assert_almost_eq!(a.skewness(), 0.2795084971874741, 1e-15);
|
|
}
|
|
|
|
#[test]
|
|
fn merge() {
|
|
let sequence: &[f64] = &[1., 2., 3., -4., 5., 6., 7., 8., 9., 1.];
|
|
for mid in 0..sequence.len() {
|
|
let (left, right) = sequence.split_at(mid);
|
|
let avg_total: Skewness = sequence.iter().map(|x| *x).collect();
|
|
let mut avg_left: Skewness = left.iter().map(|x| *x).collect();
|
|
let avg_right: Skewness = right.iter().map(|x| *x).collect();
|
|
avg_left.merge(&avg_right);
|
|
assert_eq!(avg_total.len(), avg_left.len());
|
|
assert_almost_eq!(avg_total.mean(), avg_left.mean(), 1e-14);
|
|
assert_almost_eq!(avg_total.sample_variance(), avg_left.sample_variance(), 1e-14);
|
|
assert_almost_eq!(avg_total.skewness(), avg_left.skewness(), 1e-14);
|
|
}
|
|
}
|