Commit 8d2099f1 authored by Rui Vieira's avatar Rui Vieira 🍵
Browse files

Initial commit.

parent 56ba31bb
/target
**/*.rs.bk
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extern crate rand;
use rand::prelude::*;
use rand::distributions::Normal as N;
macro_rules! assert_delta {
($x:expr, $y:expr, $d:expr) => {
if !(($x - $y).abs() < $d || ($y - $x).abs() < $d) { panic!(); }
}
}
fn mean(numbers: &Vec<f64>) -> f64 {
numbers.iter().sum::<f64>() as f64 / numbers.len() as f64
}
pub struct Normal {
mean : f64,
std : f64
}
impl Normal {
pub fn new(mean: f64, std: f64) -> Normal {
return Normal {
mean : mean,
std: std,
}
}
pub fn sample(&mut self) -> f64 {
let normal = N::new(self.mean, self.std);
let v = normal.sample(&mut rand::thread_rng());
return v;
}
}
#[cfg(test)]
mod test_labels {
use super::*;
#[test]
fn sample_mean_std() {
let n = (0..1000000);
let mut normal = Normal::new(0.0, 1.0);
let samples = n.map(|i| normal.sample()).collect::<Vec<f64>>();
let mu = mean(&samples);
print!("{:?}", mu);
assert_delta!(0.0, mu, 1e-3);
}
}
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