| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/rand_distr-0.4.3/src/unit_ball.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>unit_ball.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../rand_distr/index.html"><div class="logo-container"> |
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| </pre><pre class="rust"><code><span class="comment">// Copyright 2019 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. |
| |
| </span><span class="kw">use </span>num_traits::Float; |
| <span class="kw">use crate</span>::{uniform::SampleUniform, Distribution, Uniform}; |
| <span class="kw">use </span>rand::Rng; |
| |
| <span class="doccomment">/// Samples uniformly from the unit ball (surface and interior) in three |
| /// dimensions. |
| /// |
| /// Implemented via rejection sampling. |
| /// |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// use rand_distr::{UnitBall, Distribution}; |
| /// |
| /// let v: [f64; 3] = UnitBall.sample(&mut rand::thread_rng()); |
| /// println!("{:?} is from the unit ball.", v) |
| /// ``` |
| </span><span class="attribute">#[derive(Clone, Copy, Debug)] |
| #[cfg_attr(feature = <span class="string">"serde1"</span>, derive(serde::Serialize, serde::Deserialize))] |
| </span><span class="kw">pub struct </span>UnitBall; |
| |
| <span class="kw">impl</span><F: Float + SampleUniform> Distribution<[F; <span class="number">3</span>]> <span class="kw">for </span>UnitBall { |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>sample<R: Rng + <span class="question-mark">?</span>Sized>(<span class="kw-2">&</span><span class="self">self</span>, rng: <span class="kw-2">&mut </span>R) -> [F; <span class="number">3</span>] { |
| <span class="kw">let </span>uniform = Uniform::new(F::from(-<span class="number">1.</span>).unwrap(), F::from(<span class="number">1.</span>).unwrap()); |
| <span class="kw">let </span><span class="kw-2">mut </span>x1; |
| <span class="kw">let </span><span class="kw-2">mut </span>x2; |
| <span class="kw">let </span><span class="kw-2">mut </span>x3; |
| <span class="kw">loop </span>{ |
| x1 = uniform.sample(rng); |
| x2 = uniform.sample(rng); |
| x3 = uniform.sample(rng); |
| <span class="kw">if </span>x1 * x1 + x2 * x2 + x3 * x3 <= F::from(<span class="number">1.</span>).unwrap() { |
| <span class="kw">break</span>; |
| } |
| } |
| [x1, x2, x3] |
| } |
| } |
| </code></pre></div> |
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