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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="data.table, an R package for faster subset, grouping, assign, ordered joins and list columns in short and flexible syntax, for faster development.">
<meta name="keywords" content="R, data.table, dplyr, benchmark, big-data">
<meta name="author" content="Matt Dowle, Arun Srinivasan, other authors and contributors">
<title>data.table · Homepage</title>
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<h1> data.table<span class="lead5"><sub>v1.9.2</sub></p></h1>
<p class="lead4"> An R package that extends data.frames</p>
<p class="lead">Now on Github</p>
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<li><a href="./"><span class="glyphicon glyphicon-home"></span> data.table</a>
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<a class="dropdown-toggle" data-toggle="dropdown" href="#" id="docs"><span class="glyphicon glyphicon-pencil"></span> Get started <span class="caret"></span></a>
<ul class="dropdown-menu" aria-labelledby="docs">
<li><a href="./about/">data.table project</a></li>
<li><a href="./intro/">Quick Introduction</a></li>
<li><a href="./learn-by-example/">Learn with example</a></li>
<li><a href="./faq/">FAQs</a></li>
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<li><a href="./get-involved/">Get involved</a></li>
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<li><a href="./notes/">Release Notes</a></li>
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<a href="https://github.com/Rdatatable/data.table"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://camo.githubusercontent.com/e7bbb0521b397edbd5fe43e7f760759336b5e05f/68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f72696768745f677265656e5f3030373230302e706e67" alt="Fork me on GitHub" data-canonical-src="https://s3.amazonaws.com/github/ribbons/forkme_right_green_007200.png"></a>
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<h2 class="bs-featurette-title">short, flexible and intuitive syntax + <em>much</em> faster</h2>
<p class="lead"><span class="text-info">data.table 1.9.0</span> comes packed with <em>many</em> new <span class="text-success">features</span>, loads of internal enhancements for <span class="text-success">speed</span> and efficient <span class="text-success">memory-usage</span>, including <em>a lot</em> of <span class="text-success">bug-fixes</span>.</p>
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<h3><span class="glyphicon glyphicon-pencil"></span> Dive right in</h3>
<p>Get quickly introduced, FAQs, learn with examples </p>
<a href=./about/#get-started button type="button" class="btn btn-sm btn-success" onclick="_gaq.push(['_trackEvent', 'Jumbotron actions', 'get-started']);">Get started →</a>
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<h3><span class="glyphicon glyphicon-wrench"></span> Extensive benchmarks</h3>
<p>Speed comparisons of <code>data.table</code> against <code>base</code> and other tools including <code>dplyr</code></p>
<a href=./benchmarks/#introduction button type="button" class="btn btn-sm btn-success" onclick="_gaq.push(['_trackEvent', 'Jumbotron actions', 'benchmarks']);">On to benchmarks →</a>
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<h3><span class="glyphicon glyphicon-cog"></span> New features</h3>
<p>Learn what's new in <code2>v1.9</code2>. Fast <code2>melt</code2>, <code2>cast</code2>, enhancements to <code2>fread</code2> + more</p>
<a href=./new/#introduction button type="button" class="btn btn-sm btn-success" onclick="_gaq.push(['_trackEvent', 'Jumbotron actions', 'features']);">What's new →</a>
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<p class="lead0">data.table offers fast</p>
<div class="row">
<div class="col-md-4">
<div class="welldark well-sm">
<p>Aggregation</p>
<code3>DT[, list(sx=sum(x)), by=z]</code3>
</div>
</div>
<div class="col-md-4">
<div class="welldark well-sm">
<p>Ordered joins</p>
<code3>DT1[DT2, nomatch=, mult=]</code3>
</div>
</div>
<div class="col-md-4">
<div class="welldark well-sm">
<p>Add/modify/del columns by reference</p>
<code3>DT1[, `:=`(x=val, y=new_val, z=NULL)]</code3>
</div>
</div>
</div>
<p></p>
<div class="row">
<div class="col-md-4">
<div class="welldark well-sm">
<p>File reading</p>
<code3>fread("big_file.csv")</code3>
</div>
</div>
<div class="col-md-4">
<div class="welldark well-sm">
<p>Rolling joins</p>
<code3>DT1[DT2, nomatch=, mult=, roll=]</code3>
</div>
</div>
<div class="col-md-4">
<div class="welldark well-sm">
<p>Chained queries</p>
<code3>DT1[, cy := cumsum(y), by=x][DT2]</code3>
</div>
</div>
<p class="lead0">and more, all in a natural syntax: <code3>DT[where, select|update, by]</code3></p>
</div>
<a href="./about/#welcome" class="btn btn-success">Read about the data.table project</a>
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<p class="lead0">Contribute</p>
<p class="lead">Improve <code2>docs</code2>, report/fix <code2>bugs</code2> and implement <code2>features</code2>.</p>
<a href=./get-involved/ button type="button" class="btn btn-sm btn-success" onclick="_gaq.push(['_trackEvent', 'Jumbotron actions', 'get-involved']);">How to contribute?</a>
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<p class="lead0">Gallery</p>
<p class="lead">Examples highlighting features of <code>data.table</code>.</p>
<a href=./gallery/#welcome button type="button" class="btn btn-sm btn-success" onclick="_gaq.push(['_trackEvent', 'Jumbotron actions', 'code-examples']);">Code examples</a>
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