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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="Randomly sample exactly `amount` distinct indices from `0..length`, and return them in random order (fully shuffled)."><title>sample in rand::seq::index - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="rand" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-893ab5e7.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><h2><a href="../../../rand/index.html">rand</a><span class="version">0.8.5</span></h2></div><div class="sidebar-elems"><div id="rustdoc-modnav"><h2><a href="index.html">In rand::<wbr>seq::<wbr>index</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../../index.html">rand</a>::<wbr><a href="../index.html">seq</a>::<wbr><a href="index.html">index</a></span><h1>Function <span class="fn">sample</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/rand/seq/index.rs.html#222-259">Source</a> </span></div><pre class="rust item-decl"><code>pub fn sample&lt;R&gt;(rng: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;mut R</a>, length: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.usize.html">usize</a>, amount: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.usize.html">usize</a>) -&gt; <a class="enum" href="enum.IndexVec.html" title="enum rand::seq::index::IndexVec">IndexVec</a><div class="where">where
R: <a class="trait" href="../../trait.Rng.html" title="trait rand::Rng">Rng</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Randomly sample exactly <code>amount</code> distinct indices from <code>0..length</code>, and
return them in random order (fully shuffled).</p>
<p>This method is used internally by the slice sampling methods, but it can
sometimes be useful to have the indices themselves so this is provided as
an alternative.</p>
<p>The implementation used is not specified; we automatically select the
fastest available algorithm for the <code>length</code> and <code>amount</code> parameters
(based on detailed profiling on an Intel Haswell CPU). Roughly speaking,
complexity is <code>O(amount)</code>, except that when <code>amount</code> is small, performance
is closer to <code>O(amount^2)</code>, and when <code>length</code> is close to <code>amount</code> then
<code>O(length)</code>.</p>
<p>Note that performance is significantly better over <code>u32</code> indices than over
<code>u64</code> indices. Because of this we hide the underlying type behind an
abstraction, <code>IndexVec</code>.</p>
<p>If an allocation-free <code>no_std</code> function is required, it is suggested
to adapt the internal <code>sample_floyd</code> implementation.</p>
<p>Panics if <code>amount &gt; length</code>.</p>
</div></details></section></div></main></body></html>

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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="Randomly sample exactly `amount` distinct indices from `0..length`, and return them in an arbitrary order (there is no guarantee of shuffling or ordering). The weights are to be provided by the input function `weights`, which will be called once for each index."><title>sample_weighted in rand::seq::index - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="rand" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../../static.files/storage-59e33391.js"></script><script defer src="sidebar-items.js"></script><script defer src="../../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-893ab5e7.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><h2><a href="../../../rand/index.html">rand</a><span class="version">0.8.5</span></h2></div><div class="sidebar-elems"><div id="rustdoc-modnav"><h2><a href="index.html">In rand::<wbr>seq::<wbr>index</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../../index.html">rand</a>::<wbr><a href="../index.html">seq</a>::<wbr><a href="index.html">index</a></span><h1>Function <span class="fn">sample_weighted</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/rand/seq/index.rs.html#277-293">Source</a> </span></div><pre class="rust item-decl"><code>pub fn sample_weighted&lt;R, F, X&gt;(
rng: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.reference.html">&amp;mut R</a>,
length: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.usize.html">usize</a>,
weight: F,
amount: <a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.usize.html">usize</a>,
) -&gt; <a class="enum" href="https://doc.rust-lang.org/1.84.1/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="enum" href="enum.IndexVec.html" title="enum rand::seq::index::IndexVec">IndexVec</a>, <a class="enum" href="../../distributions/enum.WeightedError.html" title="enum rand::distributions::WeightedError">WeightedError</a>&gt;<div class="where">where
R: <a class="trait" href="../../trait.Rng.html" title="trait rand::Rng">Rng</a> + ?<a class="trait" href="https://doc.rust-lang.org/1.84.1/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,
F: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/ops/function/trait.Fn.html" title="trait core::ops::function::Fn">Fn</a>(<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.usize.html">usize</a>) -&gt; X,
X: <a class="trait" href="https://doc.rust-lang.org/1.84.1/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a>&lt;<a class="primitive" href="https://doc.rust-lang.org/1.84.1/std/primitive.f64.html">f64</a>&gt;,</div></code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Randomly sample exactly <code>amount</code> distinct indices from <code>0..length</code>, and
return them in an arbitrary order (there is no guarantee of shuffling or
ordering). The weights are to be provided by the input function <code>weights</code>,
which will be called once for each index.</p>
<p>This method is used internally by the slice sampling methods, but it can
sometimes be useful to have the indices themselves so this is provided as
an alternative.</p>
<p>This implementation uses <code>O(length + amount)</code> space and <code>O(length)</code> time
if the “nightly” feature is enabled, or <code>O(length)</code> space and
<code>O(length + amount * log length)</code> time otherwise.</p>
<p>Panics if <code>amount &gt; length</code>.</p>
</div></details></section></div></main></body></html>

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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="Low-level API for sampling indices"><title>rand::seq::index - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../../" data-static-root-path="../../../static.files/" data-current-crate="rand" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.1 (e71f9a9a9 2025-01-27)" data-channel="1.84.1" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../../static.files/storage-59e33391.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../../static.files/noscript-893ab5e7.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc mod"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt=""></a></nav><nav class="sidebar"><div class="sidebar-crate"><a class="logo-container" href="../../../rand/index.html"><img src="https://www.rust-lang.org/logos/rust-logo-128x128-blk.png" alt="logo"></a><h2><a href="../../../rand/index.html">rand</a><span class="version">0.8.5</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module index</a></h2><h3><a href="#enums">Module Items</a></h3><ul class="block"><li><a href="#enums" title="Enums">Enums</a></li><li><a href="#functions" title="Functions">Functions</a></li></ul></section><div id="rustdoc-modnav"><h2><a href="../index.html">In rand::<wbr>seq</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="../../index.html">rand</a>::<wbr><a href="../index.html">seq</a></span><h1>Module <span>index</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../../src/rand/seq/index.rs.html#9-678">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Low-level API for sampling indices</p>
</div></details><h2 id="enums" class="section-header">Enums<a href="#enums" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="enum" href="enum.IndexVec.html" title="enum rand::seq::index::IndexVec">Index<wbr>Vec</a></div><div class="desc docblock-short">A vector of indices.</div></li><li><div class="item-name"><a class="enum" href="enum.IndexVecIntoIter.html" title="enum rand::seq::index::IndexVecIntoIter">Index<wbr>VecInto<wbr>Iter</a></div><div class="desc docblock-short">Return type of <code>IndexVec::into_iter</code>.</div></li><li><div class="item-name"><a class="enum" href="enum.IndexVecIter.html" title="enum rand::seq::index::IndexVecIter">Index<wbr>VecIter</a></div><div class="desc docblock-short">Return type of <code>IndexVec::iter</code>.</div></li></ul><h2 id="functions" class="section-header">Functions<a href="#functions" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="fn" href="fn.sample.html" title="fn rand::seq::index::sample">sample</a></div><div class="desc docblock-short">Randomly sample exactly <code>amount</code> distinct indices from <code>0..length</code>, and
return them in random order (fully shuffled).</div></li><li><div class="item-name"><a class="fn" href="fn.sample_weighted.html" title="fn rand::seq::index::sample_weighted">sample_<wbr>weighted</a></div><div class="desc docblock-short">Randomly sample exactly <code>amount</code> distinct indices from <code>0..length</code>, and
return them in an arbitrary order (there is no guarantee of shuffling or
ordering). The weights are to be provided by the input function <code>weights</code>,
which will be called once for each index.</div></li></ul></section></div></main></body></html>

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