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  1. <!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="API documentation for the Rust `sample_iter` fn in crate `rand`."><meta name="keywords" content="rust, rustlang, rust-lang, sample_iter"><title>rand::seq::sample_iter - Rust</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="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><link rel="shortcut icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc fn"><!--[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">&#9776;</div><a href='../../rand/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk.png' alt='logo' width='100'></a><div class="sidebar-elems"><p class='location'><a href='../index.html'>rand</a>::<wbr><a href='index.html'>seq</a></p><script>window.sidebarCurrent = {name: 'sample_iter', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='in-band'>Function <a href='../index.html'>rand</a>::<wbr><a href='index.html'>seq</a>::<wbr><a class="fn" href=''>sample_iter</a></span><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>&#x2212;</span>]</a></span><a class='srclink' href='../../src/rand/seq.rs.html#41-67' title='goto source code'>[src]</a></span></h1><pre class='rust fn'>pub fn sample_iter&lt;T, I, R:&nbsp;?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>&gt;(<br>&nbsp;&nbsp;&nbsp;&nbsp;rng: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&amp;mut </a>R, <br>&nbsp;&nbsp;&nbsp;&nbsp;iterable: I, <br>&nbsp;&nbsp;&nbsp;&nbsp;amount: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a><br>) -&gt; <a class="enum" href="https://doc.rust-lang.org/nightly/core/result/enum.Result.html" title="enum core::result::Result">Result</a>&lt;<a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;T&gt;, <a class="struct" href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html" title="struct alloc::vec::Vec">Vec</a>&lt;T&gt;&gt; <span class="where fmt-newline">where<br>&nbsp;&nbsp;&nbsp;&nbsp;I: <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/trait.IntoIterator.html" title="trait core::iter::traits::IntoIterator">IntoIterator</a>&lt;Item = T&gt;,<br>&nbsp;&nbsp;&nbsp;&nbsp;R: <a class="trait" href="../../rand/trait.Rng.html" title="trait rand::Rng">Rng</a>,&nbsp;</span></pre><div class='docblock'><p>Randomly sample <code>amount</code> elements from a finite iterator.</p>
    2. 

  2. <p>The following can be returned:</p>
    3. 

  3. <ul>
    4. 

  4. <li><code>Ok</code>: <code>Vec</code> of <code>amount</code> non-repeating randomly sampled elements. The order is not random.</li>
    5. 

  5. <li><code>Err</code>: <code>Vec</code> of all the elements from <code>iterable</code> in sequential order. This happens when the
    6. 

  6. length of <code>iterable</code> was less than <code>amount</code>. This is considered an error since exactly
    7. 

  7. <code>amount</code> elements is typically expected.</li>
    8. 

  8. </ul>
    9. 

  9. <p>This implementation uses <code>O(len(iterable))</code> time and <code>O(amount)</code> memory.</p>
    10. 

  10. <h1 id="example" class="section-header"><a href="#example">Example</a></h1>
    11. 

  11. <pre class="rust rust-example-rendered">
    12. 

  12. <span class="kw">use</span> <span class="ident">rand</span>::{<span class="ident">thread_rng</span>, <span class="ident">seq</span>};
    13. 

  13. 

  14. <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">thread_rng</span>();
    15. 

  15. <span class="kw">let</span> <span class="ident">sample</span> <span class="op">=</span> <span class="ident">seq</span>::<span class="ident">sample_iter</span>(<span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">rng</span>, <span class="number">1</span>..<span class="number">100</span>, <span class="number">5</span>).<span class="ident">unwrap</span>();
    16. 

  16. <span class="macro">println</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">sample</span>);</pre>
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