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<!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 `/home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/rand_distr-0.3.0/src/unit_ball.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>unit_ball.rs - source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><script src="../../crates.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="shortcut icon" href="https://www.rust-lang.org/favicon.ico"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu" role="button">☰</div><a href='../../rand_distr/index.html'><div class='logo-container'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk.png' alt='logo'></div></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" height="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="comment">// Copyright 2019 Developers of the Rand project.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="kw">use</span> <span class="ident">num_traits</span>::<span class="ident">Float</span>;
<span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">uniform</span>::<span class="ident">SampleUniform</span>, <span class="ident">Distribution</span>, <span class="ident">Uniform</span>};
<span class="kw">use</span> <span class="ident">rand</span>::<span class="ident">Rng</span>;
<span class="doccomment">/// Samples uniformly from the unit ball (surface and interior) in three</span>
<span class="doccomment">/// dimensions.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implemented via rejection sampling.</span>
<span class="doccomment">///</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use rand_distr::{UnitBall, Distribution};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let v: [f64; 3] = UnitBall.sample(&mut rand::thread_rng());</span>
<span class="doccomment">/// println!("{:?} is from the unit ball.", v)</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">UnitBall</span>;
<span class="kw">impl</span><span class="op"><</span><span class="ident">F</span>: <span class="ident">Float</span> <span class="op">+</span> <span class="ident">SampleUniform</span><span class="op">></span> <span class="ident">Distribution</span><span class="op"><</span>[<span class="ident">F</span>; <span class="number">3</span>]<span class="op">></span> <span class="kw">for</span> <span class="ident">UnitBall</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">sample</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Rng</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">rng</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">R</span>) <span class="op">-</span><span class="op">></span> [<span class="ident">F</span>; <span class="number">3</span>] {
<span class="kw">let</span> <span class="ident">uniform</span> <span class="op">=</span> <span class="ident">Uniform</span>::<span class="ident">new</span>(<span class="ident">F</span>::<span class="ident">from</span>(<span class="op">-</span><span class="number">1.</span>).<span class="ident">unwrap</span>(), <span class="ident">F</span>::<span class="ident">from</span>(<span class="number">1.</span>).<span class="ident">unwrap</span>());
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">x1</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">x2</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">x3</span>;
<span class="kw">loop</span> {
<span class="ident">x1</span> <span class="op">=</span> <span class="ident">uniform</span>.<span class="ident">sample</span>(<span class="ident">rng</span>);
<span class="ident">x2</span> <span class="op">=</span> <span class="ident">uniform</span>.<span class="ident">sample</span>(<span class="ident">rng</span>);
<span class="ident">x3</span> <span class="op">=</span> <span class="ident">uniform</span>.<span class="ident">sample</span>(<span class="ident">rng</span>);
<span class="kw">if</span> <span class="ident">x1</span> <span class="op">*</span> <span class="ident">x1</span> <span class="op">+</span> <span class="ident">x2</span> <span class="op">*</span> <span class="ident">x2</span> <span class="op">+</span> <span class="ident">x3</span> <span class="op">*</span> <span class="ident">x3</span> <span class="op"><</span><span class="op">=</span> <span class="ident">F</span>::<span class="ident">from</span>(<span class="number">1.</span>).<span class="ident">unwrap</span>() {
<span class="kw">break</span>;
}
}
[<span class="ident">x1</span>, <span class="ident">x2</span>, <span class="ident">x3</span>]
}
}
</pre></div>
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