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| </pre><pre class="rust"><code><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::Float</span>; |
| <span class="kw">use</span> <span class="kw">crate</span>::{<span class="ident">uniform::SampleUniform</span>, <span class="ident">Distribution</span>, <span class="ident">Uniform</span>}; |
| <span class="kw">use</span> <span class="ident">rand::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="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"serde1"</span>, <span class="ident">derive</span>(<span class="ident">serde::Serialize</span>, <span class="ident">serde::Deserialize</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">&mut</span> <span class="ident">R</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::new</span>(<span class="ident">F::from</span>(<span class="op">-</span><span class="number">1.</span>).<span class="ident">unwrap</span>(), <span class="ident">F::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::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>] |
| } |
| } |
| </code></pre></div> |
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