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<!DOCTYPE html><htmllang="en"><head><metacharset="utf-8"><metaname="viewport"content="width=device-width, initial-scale=1.0"><metaname="generator"content="rustdoc"><metaname="description"content="API documentation for the Rust `sample_indices` fn in crate `rand`."><metaname="keywords"content="rust, rustlang, rust-lang, sample_indices"><title>rand::seq::sample_indices - Rust</title><linkrel="stylesheet"type="text/css"href="../../normalize.css"><linkrel="stylesheet"type="text/css"href="../../rustdoc.css"id="mainThemeStyle"><linkrel="stylesheet"type="text/css"href="../../dark.css"><linkrel="stylesheet"type="text/css"href="../../light.css"id="themeStyle"><scriptsrc="../../storage.js"></script><noscript><linkrel="stylesheet"href="../../noscript.css"></noscript><linkrel="shortcut icon"href="https://www.rust-lang.org/favicon.ico"><styletype="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></head><bodyclass="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><navclass="sidebar"><divclass="sidebar-menu">☰</div><ahref='../../rand/index.html'><divclass='logo-container'><imgsrc='https://www.rust-lang.org/logos/rust-logo-128x128-blk.png'alt='logo'></div></a><divclass="sidebar-elems"><pclass='location'><ahref='../index.html'>rand</a>::<wbr><ahref='index.html'>seq</a></p><script>window.sidebarCurrent={name:'sample_indices',ty:'fn',relpath:''};</script><scriptdefersrc="sidebar-items.js"></script></div></nav><divclass="theme-picker"><buttonid="theme-picker"aria-label="Pick another theme!"><imgsrc="../../brush.svg"width="18"alt="Pick another theme!"></button><divid="theme-choices"></div></div><scriptsrc="../../theme.js"></script><navclass="sub"><formclass="search-form js-only"><divclass="search-container"><div><selectid="crate-search"><optionvalue="All crates">All crates</option></select><inputclass="search-input"name="search"autocomplete="off"spellcheck="false"placeholder="Click or press ‘S’ to search, ‘?’ for more options…"type="search"></div><aid="settings-menu"href="../../settings.html"><imgsrc="../../wheel.svg"width="18"alt="Change settings"></a></div></form></nav><sectionid="main"class="content"><h1class='fqn'><spanclass='out-of-band'><spanid='render-detail'><aid="toggle-all-docs"href="javascript:void(0)"title="collapse all docs">[<spanclass='inner'>−</span>]</a></span><aclass='srclink'href='../../src/rand/seq.rs.html#134-158'title='goto source code'>[src]</a></span><spanclass='in-band'>Function <ahref='../index.html'>rand</a>::<wbr><ahref='index.html'>seq</a>::<wbr><aclass="fn"href=''>sample_indices</a></span></h1><preclass='rust fn'>pub fn sample_indices<R>(<br> rng: <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&mut </a>R, <br> length: <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>, <br> amount: <aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a><br>) -><aclass="struct"href="https://doc.rust-lang.org/nightly/alloc/vec/struct.Vec.html"title="struct alloc::vec::Vec">Vec</a><<aclass="primitive"href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>><spanclass="where fmt-newline">where<br> R: <aclass="trait"href="../../rand/trait.Rng.html"title="trait rand::Rng">Rng</a>, </span></pre><divclass='docblock'><p>Randomly sample exactly <code>amount</code> indices from <code>0..length</code>.</p>
<p>The values are non-repeating and in random order.</p>
<p>This implementation uses <code>O(amount)</code> time and memory.</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>Panics if <code>amount > length</code></p>
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