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| </pre><pre class="rust"><code><span class="comment">// Copyright 2018 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="doccomment">//! The Weibull distribution.</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">Distribution</span>, <span class="ident">OpenClosed01</span>}; |
| <span class="kw">use</span> <span class="ident">rand::Rng</span>; |
| <span class="kw">use</span> <span class="ident">core::fmt</span>; |
| |
| <span class="doccomment">/// Samples floating-point numbers according to the Weibull distribution</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// # Example</span> |
| <span class="doccomment">/// ```</span> |
| <span class="doccomment">/// use rand::prelude::*;</span> |
| <span class="doccomment">/// use rand_distr::Weibull;</span> |
| <span class="doccomment">///</span> |
| <span class="doccomment">/// let val: f64 = thread_rng().sample(Weibull::new(1., 10.).unwrap());</span> |
| <span class="doccomment">/// println!("{}", val);</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">Weibull</span><span class="op"><</span><span class="ident">F</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">Float</span>, <span class="ident">OpenClosed01</span>: <span class="ident">Distribution</span><span class="op"><</span><span class="ident">F</span><span class="op">></span> |
| { |
| <span class="ident">inv_shape</span>: <span class="ident">F</span>, |
| <span class="ident">scale</span>: <span class="ident">F</span>, |
| } |
| |
| <span class="doccomment">/// Error type returned from `Weibull::new`.</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 class="ident">PartialEq</span>, <span class="ident">Eq</span>)]</span> |
| <span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Error</span> { |
| <span class="doccomment">/// `scale <= 0` or `nan`.</span> |
| <span class="ident">ScaleTooSmall</span>, |
| <span class="doccomment">/// `shape <= 0` or `nan`.</span> |
| <span class="ident">ShapeTooSmall</span>, |
| } |
| |
| <span class="kw">impl</span> <span class="ident">fmt::Display</span> <span class="kw">for</span> <span class="ident">Error</span> { |
| <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&mut</span> <span class="ident">fmt::Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) -> <span class="ident">fmt::Result</span> { |
| <span class="ident">f</span>.<span class="ident">write_str</span>(<span class="kw">match</span> <span class="self">self</span> { |
| <span class="ident">Error::ScaleTooSmall</span> => <span class="string">"scale is not positive in Weibull distribution"</span>, |
| <span class="ident">Error::ShapeTooSmall</span> => <span class="string">"shape is not positive in Weibull distribution"</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span> |
| <span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">doc_cfg</span>, <span class="ident">doc</span>(<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)))]</span> |
| <span class="kw">impl</span> <span class="ident">std::error::Error</span> <span class="kw">for</span> <span class="ident">Error</span> {} |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">F</span><span class="op">></span> <span class="ident">Weibull</span><span class="op"><</span><span class="ident">F</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">Float</span>, <span class="ident">OpenClosed01</span>: <span class="ident">Distribution</span><span class="op"><</span><span class="ident">F</span><span class="op">></span> |
| { |
| <span class="doccomment">/// Construct a new `Weibull` distribution with given `scale` and `shape`.</span> |
| <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">scale</span>: <span class="ident">F</span>, <span class="ident">shape</span>: <span class="ident">F</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Weibull</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>, <span class="ident">Error</span><span class="op">></span> { |
| <span class="kw">if</span> <span class="op">!</span>(<span class="ident">scale</span> <span class="op">></span> <span class="ident">F::zero</span>()) { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">Error::ScaleTooSmall</span>); |
| } |
| <span class="kw">if</span> <span class="op">!</span>(<span class="ident">shape</span> <span class="op">></span> <span class="ident">F::zero</span>()) { |
| <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">Error::ShapeTooSmall</span>); |
| } |
| <span class="prelude-val">Ok</span>(<span class="ident">Weibull</span> { |
| <span class="ident">inv_shape</span>: <span class="ident">F::from</span>(<span class="number">1.</span>).<span class="ident">unwrap</span>() <span class="op">/</span> <span class="ident">shape</span>, |
| <span class="ident">scale</span>, |
| }) |
| } |
| } |
| |
| <span class="kw">impl</span><span class="op"><</span><span class="ident">F</span><span class="op">></span> <span class="ident">Distribution</span><span class="op"><</span><span class="ident">F</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Weibull</span><span class="op"><</span><span class="ident">F</span><span class="op">></span> |
| <span class="kw">where</span> <span class="ident">F</span>: <span class="ident">Float</span>, <span class="ident">OpenClosed01</span>: <span class="ident">Distribution</span><span class="op"><</span><span class="ident">F</span><span class="op">></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="kw">let</span> <span class="ident">x</span>: <span class="ident">F</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">sample</span>(<span class="ident">OpenClosed01</span>); |
| <span class="self">self</span>.<span class="ident">scale</span> <span class="op">*</span> (<span class="op">-</span><span class="ident">x</span>.<span class="ident">ln</span>()).<span class="ident">powf</span>(<span class="self">self</span>.<span class="ident">inv_shape</span>) |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span> |
| <span class="kw">mod</span> <span class="ident">tests</span> { |
| <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>; |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="attribute">#[<span class="ident">should_panic</span>]</span> |
| <span class="kw">fn</span> <span class="ident">invalid</span>() { |
| <span class="ident">Weibull::new</span>(<span class="number">0.</span>, <span class="number">0.</span>).<span class="ident">unwrap</span>(); |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">sample</span>() { |
| <span class="kw">let</span> <span class="ident">scale</span> <span class="op">=</span> <span class="number">1.0</span>; |
| <span class="kw">let</span> <span class="ident">shape</span> <span class="op">=</span> <span class="number">2.0</span>; |
| <span class="kw">let</span> <span class="ident">d</span> <span class="op">=</span> <span class="ident">Weibull::new</span>(<span class="ident">scale</span>, <span class="ident">shape</span>).<span class="ident">unwrap</span>(); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::test::rng</span>(<span class="number">1</span>); |
| <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">1000</span> { |
| <span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="ident">d</span>.<span class="ident">sample</span>(<span class="kw-2">&mut</span> <span class="ident">rng</span>); |
| <span class="macro">assert!</span>(<span class="ident">r</span> <span class="op">></span><span class="op">=</span> <span class="number">0.</span>); |
| } |
| } |
| |
| <span class="attribute">#[<span class="ident">test</span>]</span> |
| <span class="kw">fn</span> <span class="ident">value_stability</span>() { |
| <span class="kw">fn</span> <span class="ident">test_samples</span><span class="op"><</span><span class="ident">F</span>: <span class="ident">Float</span> <span class="op">+</span> <span class="ident">core::fmt::Debug</span>, <span class="ident">D</span>: <span class="ident">Distribution</span><span class="op"><</span><span class="ident">F</span><span class="op">></span><span class="op">></span>( |
| <span class="ident">distr</span>: <span class="ident">D</span>, <span class="ident">zero</span>: <span class="ident">F</span>, <span class="ident">expected</span>: <span class="kw-2">&</span>[<span class="ident">F</span>], |
| ) { |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident"><span class="kw">crate</span>::test::rng</span>(<span class="number">213</span>); |
| <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="ident">zero</span>; <span class="number">4</span>]; |
| <span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="kw-2">&mut</span> <span class="ident">buf</span> { |
| <span class="kw-2">*</span><span class="ident">x</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">sample</span>(<span class="kw-2">&</span><span class="ident">distr</span>); |
| } |
| <span class="macro">assert_eq!</span>(<span class="ident">buf</span>, <span class="ident">expected</span>); |
| } |
| |
| <span class="ident">test_samples</span>(<span class="ident">Weibull::new</span>(<span class="number">1.0</span>, <span class="number">1.0</span>).<span class="ident">unwrap</span>(), <span class="number">0f32</span>, <span class="kw-2">&</span>[ |
| <span class="number">0.041495778</span>, |
| <span class="number">0.7531094</span>, |
| <span class="number">1.4189332</span>, |
| <span class="number">0.38386202</span>, |
| ]); |
| <span class="ident">test_samples</span>(<span class="ident">Weibull::new</span>(<span class="number">2.0</span>, <span class="number">0.5</span>).<span class="ident">unwrap</span>(), <span class="number">0f64</span>, <span class="kw-2">&</span>[ |
| <span class="number">1.1343478702739669</span>, |
| <span class="number">0.29470010050655226</span>, |
| <span class="number">0.7556151370284702</span>, |
| <span class="number">7.877212340241561</span>, |
| ]); |
| } |
| } |
| </code></pre></div> |
| </section><section id="search" class="content hidden"></section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="rand_distr" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.60.0-nightly (1bd4fdc94 2022-01-12)" ></div> |
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