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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="API documentation for the Rust `num` crate."><meta name="keywords" content="rust, rustlang, rust-lang, num"><title>num - 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><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[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">☰</div><a href='../num/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><p class='location'>Crate num</p><div class="sidebar-elems"><a id='all-types' href='all.html'><p>See all num's items</p></a><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#structs">Structs</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li><li><a href="#types">Type Definitions</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'num', ty: 'mod', relpath: '../'};</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"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><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='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../src/num/lib.rs.html#11-113' title='goto source code'>[src]</a></span><span class='in-band'>Crate <a class="mod" href=''>num</a></span></h1><div class='docblock'><p>A collection of numeric types and traits for Rust.</p>
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<p>This includes new types for big integers, rationals, and complex numbers,
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new traits for generic programming on numeric properties like <code>Integer</code>,
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and generic range iterators.</p>
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<h2 id="example" class="section-header"><a href="#example">Example</a></h2>
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<p>This example uses the BigRational type and <a href="https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method">Newton's method</a> to
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approximate a square root to arbitrary precision:</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">num</span>;
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<span class="kw">use</span> <span class="ident">num</span>::<span class="ident">FromPrimitive</span>;
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<span class="kw">use</span> <span class="ident">num</span>::<span class="ident">bigint</span>::<span class="ident">BigInt</span>;
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<span class="kw">use</span> <span class="ident">num</span>::<span class="ident">rational</span>::{<span class="ident">Ratio</span>, <span class="ident">BigRational</span>};
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<span class="kw">fn</span> <span class="ident">approx_sqrt</span>(<span class="ident">number</span>: <span class="ident">u64</span>, <span class="ident">iterations</span>: <span class="ident">usize</span>) <span class="op">-</span><span class="op">></span> <span class="ident">BigRational</span> {
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<span class="kw">let</span> <span class="ident">start</span>: <span class="ident">Ratio</span><span class="op"><</span><span class="ident">BigInt</span><span class="op">></span> <span class="op">=</span> <span class="ident">Ratio</span>::<span class="ident">from_integer</span>(<span class="ident">FromPrimitive</span>::<span class="ident">from_u64</span>(<span class="ident">number</span>).<span class="ident">unwrap</span>());
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">approx</span> <span class="op">=</span> <span class="ident">start</span>.<span class="ident">clone</span>();
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<span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="ident">iterations</span> {
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<span class="ident">approx</span> <span class="op">=</span> (<span class="kw-2">&</span><span class="ident">approx</span> <span class="op">+</span> (<span class="kw-2">&</span><span class="ident">start</span> <span class="op">/</span> <span class="kw-2">&</span><span class="ident">approx</span>)) <span class="op">/</span>
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<span class="ident">Ratio</span>::<span class="ident">from_integer</span>(<span class="ident">FromPrimitive</span>::<span class="ident">from_u64</span>(<span class="number">2</span>).<span class="ident">unwrap</span>());
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}
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<span class="ident">approx</span>
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}
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{}"</span>, <span class="ident">approx_sqrt</span>(<span class="number">10</span>, <span class="number">4</span>)); <span class="comment">// prints 4057691201/1283082416</span>
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}
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</pre></div>
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<h2 id="compatibility" class="section-header"><a href="#compatibility">Compatibility</a></h2>
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<p>The <code>num</code> crate is tested for rustc 1.8 and greater.</p>
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</div><h2 id='modules' class='section-header'><a href="#modules">Modules</a></h2>
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<table><tr class='module-item'><td><a class="mod" href="bigint/index.html" title='num::bigint mod'>bigint</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="mod" href="cast/index.html" title='num::cast mod'>cast</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="mod" href="complex/index.html" title='num::complex mod'>complex</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="mod" href="integer/index.html" title='num::integer mod'>integer</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="mod" href="iter/index.html" title='num::iter mod'>iter</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="mod" href="pow/index.html" title='num::pow mod'>pow</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="mod" href="rational/index.html" title='num::rational mod'>rational</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="mod" href="traits/index.html" title='num::traits mod'>traits</a></td><td class='docblock-short'></td></tr></table><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table><tr class='module-item'><td><a class="struct" href="struct.BigInt.html" title='num::BigInt struct'>BigInt</a></td><td class='docblock-short'><p>A big signed integer type.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.BigUint.html" title='num::BigUint struct'>BigUint</a></td><td class='docblock-short'><p>A big unsigned integer type.</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.Complex.html" title='num::Complex struct'>Complex</a></td><td class='docblock-short'><p>A complex number in Cartesian form.</p>
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</td></tr></table><h2 id='traits' class='section-header'><a href="#traits">Traits</a></h2>
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<table><tr class='module-item'><td><a class="trait" href="trait.Bounded.html" title='num::Bounded trait'>Bounded</a></td><td class='docblock-short'><p>Numbers which have upper and lower bounds</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.CheckedAdd.html" title='num::CheckedAdd trait'>CheckedAdd</a></td><td class='docblock-short'><p>Performs addition that returns <code>None</code> instead of wrapping around on
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overflow.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.CheckedDiv.html" title='num::CheckedDiv trait'>CheckedDiv</a></td><td class='docblock-short'><p>Performs division that returns <code>None</code> instead of panicking on division by zero and instead of
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wrapping around on underflow and overflow.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.CheckedMul.html" title='num::CheckedMul trait'>CheckedMul</a></td><td class='docblock-short'><p>Performs multiplication that returns <code>None</code> instead of wrapping around on underflow or
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overflow.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.CheckedSub.html" title='num::CheckedSub trait'>CheckedSub</a></td><td class='docblock-short'><p>Performs subtraction that returns <code>None</code> instead of wrapping around on underflow.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.Float.html" title='num::Float trait'>Float</a></td><td class='docblock-short'><p>Generic trait for floating point numbers</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.FromPrimitive.html" title='num::FromPrimitive trait'>FromPrimitive</a></td><td class='docblock-short'><p>A generic trait for converting a number to a value.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.Integer.html" title='num::Integer trait'>Integer</a></td><td class='docblock-short'></td></tr><tr class='module-item'><td><a class="trait" href="trait.Num.html" title='num::Num trait'>Num</a></td><td class='docblock-short'><p>The base trait for numeric types, covering <code>0</code> and <code>1</code> values,
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comparisons, basic numeric operations, and string conversion.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.NumCast.html" title='num::NumCast trait'>NumCast</a></td><td class='docblock-short'><p>An interface for casting between machine scalars.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.One.html" title='num::One trait'>One</a></td><td class='docblock-short'><p>Defines a multiplicative identity element for <code>Self</code>.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.PrimInt.html" title='num::PrimInt trait'>PrimInt</a></td><td class='docblock-short'><p>Generic trait for primitive integers.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.Saturating.html" title='num::Saturating trait'>Saturating</a></td><td class='docblock-short'><p>Saturating math operations</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.Signed.html" title='num::Signed trait'>Signed</a></td><td class='docblock-short'><p>Useful functions for signed numbers (i.e. numbers that can be negative).</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.ToPrimitive.html" title='num::ToPrimitive trait'>ToPrimitive</a></td><td class='docblock-short'><p>A generic trait for converting a value to a number.</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.Unsigned.html" title='num::Unsigned trait'>Unsigned</a></td><td class='docblock-short'><p>A trait for values which cannot be negative</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.Zero.html" title='num::Zero trait'>Zero</a></td><td class='docblock-short'><p>Defines an additive identity element for <code>Self</code>.</p>
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</td></tr></table><h2 id='functions' class='section-header'><a href="#functions">Functions</a></h2>
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<table><tr class='module-item'><td><a class="fn" href="fn.abs.html" title='num::abs fn'>abs</a></td><td class='docblock-short'><p>Computes the absolute value.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.abs_sub.html" title='num::abs_sub fn'>abs_sub</a></td><td class='docblock-short'><p>The positive difference of two numbers.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.cast.html" title='num::cast fn'>cast</a></td><td class='docblock-short'><p>Cast from one machine scalar to another.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.checked_pow.html" title='num::checked_pow fn'>checked_pow</a></td><td class='docblock-short'><p>Raises a value to the power of exp, returning <code>None</code> if an overflow occurred.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.clamp.html" title='num::clamp fn'>clamp</a></td><td class='docblock-short'><p>A value bounded by a minimum and a maximum</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.one.html" title='num::one fn'>one</a></td><td class='docblock-short'><p>Returns the multiplicative identity, <code>1</code>.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.pow.html" title='num::pow fn'>pow</a></td><td class='docblock-short'><p>Raises a value to the power of exp, using exponentiation by squaring.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.range.html" title='num::range fn'>range</a></td><td class='docblock-short'><p>Returns an iterator over the given range [start, stop) (that is, starting
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at start (inclusive), and ending at stop (exclusive)).</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.range_inclusive.html" title='num::range_inclusive fn'>range_inclusive</a></td><td class='docblock-short'><p>Return an iterator over the range [start, stop]</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.range_step.html" title='num::range_step fn'>range_step</a></td><td class='docblock-short'><p>Return an iterator over the range [start, stop) by <code>step</code>. It handles overflow by stopping.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.range_step_inclusive.html" title='num::range_step_inclusive fn'>range_step_inclusive</a></td><td class='docblock-short'><p>Return an iterator over the range [start, stop] by <code>step</code>. It handles overflow by stopping.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.signum.html" title='num::signum fn'>signum</a></td><td class='docblock-short'><p>Returns the sign of the number.</p>
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</td></tr><tr class='module-item'><td><a class="fn" href="fn.zero.html" title='num::zero fn'>zero</a></td><td class='docblock-short'><p>Returns the additive identity, <code>0</code>.</p>
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</td></tr></table><h2 id='types' class='section-header'><a href="#types">Type Definitions</a></h2>
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<table><tr class='module-item'><td><a class="type" href="type.BigRational.html" title='num::BigRational type'>BigRational</a></td><td class='docblock-short'><p>Alias for arbitrary precision rationals.</p>
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</td></tr><tr class='module-item'><td><a class="type" href="type.Rational.html" title='num::Rational type'>Rational</a></td><td class='docblock-short'><p>Alias for a <code>Ratio</code> of machine-sized integers.</p>
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</td></tr></table></section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g., <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g., <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g., <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../";window.currentCrate = "num";</script><script src="../aliases.js"></script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html> |
