diff options
Diffstat (limited to 'rand/src/distributions/weibull.rs')
-rw-r--r-- | rand/src/distributions/weibull.rs | 64 |
1 files changed, 0 insertions, 64 deletions
diff --git a/rand/src/distributions/weibull.rs b/rand/src/distributions/weibull.rs deleted file mode 100644 index 483714f..0000000 --- a/rand/src/distributions/weibull.rs +++ /dev/null @@ -1,64 +0,0 @@ -// Copyright 2018 Developers of the Rand project. -// -// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or -// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license -// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your -// option. This file may not be copied, modified, or distributed -// except according to those terms. - -//! The Weibull distribution. -#![allow(deprecated)] - -use crate::Rng; -use crate::distributions::{Distribution, OpenClosed01}; - -/// Samples floating-point numbers according to the Weibull distribution -#[deprecated(since="0.7.0", note="moved to rand_distr crate")] -#[derive(Clone, Copy, Debug)] -pub struct Weibull { - inv_shape: f64, - scale: f64, -} - -impl Weibull { - /// Construct a new `Weibull` distribution with given `scale` and `shape`. - /// - /// # Panics - /// - /// `scale` and `shape` have to be non-zero and positive. - pub fn new(scale: f64, shape: f64) -> Weibull { - assert!((scale > 0.) & (shape > 0.)); - Weibull { inv_shape: 1./shape, scale } - } -} - -impl Distribution<f64> for Weibull { - fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> f64 { - let x: f64 = rng.sample(OpenClosed01); - self.scale * (-x.ln()).powf(self.inv_shape) - } -} - -#[cfg(test)] -mod tests { - use crate::distributions::Distribution; - use super::Weibull; - - #[test] - #[should_panic] - fn invalid() { - Weibull::new(0., 0.); - } - - #[test] - fn sample() { - let scale = 1.0; - let shape = 2.0; - let d = Weibull::new(scale, shape); - let mut rng = crate::test::rng(1); - for _ in 0..1000 { - let r = d.sample(&mut rng); - assert!(r >= 0.); - } - } -} |