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dendrogram.html
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<!DOCTYPE html>
<html lang="en">
<head>
<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>
<script>
(adsbygoogle = window.adsbygoogle || []).push({
google_ad_client: "ca-pub-3523953066677938",
enable_page_level_ads: true
});
</script>
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function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', 'UA-79254642-6');
</script>
<meta charset="utf-8">
<title>Dendrogram | the D3 Graph Gallery</title>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="Dendrogram with Javascript and D3.js: A set of examples with reproducible code.">
<meta name="keywords" content="Data,Dataviz,Datavisualization,Javascript,D3,D3.js,sankey, flow chart">
<meta name="author" content="Yan Holtz">
<link rel="icon" href="img/logo/D3_single_small.png">
<meta property="og:title" content="Area Chart | the D3 Graph Gallery">
<meta property="og:image" content="img/overview_RGG.png">
<meta property="og:description" content="Dendrogram with Javascript and D3.js: A set of examples with reproducible code.">
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<!-- THIS ALLOWS TO INSERT THE MENU THAT IS STORED IN A MENU.HTML FILE-->
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<!-- Header -->
<header class="masthead" style="padding-top: 150px; padding-bottom: 80px">
<div class="textlanding">
<h1>Dendrogram</h1>
<hr class="short_hr">
<br>
<ul class="list-inline social-buttons">
<li class="list-inline-item">
<a href="https://twitter.com/R_Graph_Gallery">
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<br><br>
<p style="max-width: 700px; margin: auto">A <a href="https://www.data-to-viz.com/graph/dendrogram.html">dendrogram</a> shows a <u>hierarchical</u> structure. It is constituted of a <u>root</u> node that gives birth to several nodes connected by <u>edges</u> or branches. Last nodes of the hierarchy are called <u>leaves</u>. Learn more about its theory on <a href="https://www.data-to-viz.com/graph/dendrogram.html">data-to-viz.com</a>, or visit the examples below to learn how to implement it in d3.js</p>
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<p class="mySeryTitle">A note on input data format</p>
<hr>
<p>Building dendrogram with <code>d3.js</code> requires to have an input at the <code>Json</code> format, like <a href="https://raw.githubusercontent.com/holtzy/D3-graph-gallery/master/DATA/data_dendrogram.json">here</a>. The <a href="https://github.com/timelyportfolio/d3r">d3r package</a> makes it a breeze to get this format from a <code>R</code> data frame.</p>
<div id="summary">
<div class="collapse" id="collapseSummary">
<pre class="language-js"><code id="codejs" contenteditable="false"><xmp># This is R code
# create a simple hierarchy
data <- data.frame(
level1="CEO",
level2=c( rep("boss1",4), rep("boss2",4)),
level3=paste0("mister_", letters[1:8])
)
# transform it to json format
library(d3r)
data_json <- d3_nest(data)
# Save in a json file
write(data_json, "data_ready.json")
</xmp></code></pre>
<p>You're now ready to use the file called <code>data_ready.json</code> in your d3.js chart</p>
</div>
<a class="collapsed" data-toggle="collapse" href="#collapseSummary" aria-expanded="false" aria-controls="collapseSummary"></a>
<br><br><br><br>
<div class="mySeryTitle">Step by step</div>
<hr>
<p>Building a dendrogram with d3.js always follows the same steps. <u>First</u>, a cluster layout must be defined with <code>d3.cluster()</code>. <u>Second</u>, data is provided to this layout thanks to <code>d3.hierarchy()</code>. We now have an object with nodes coordinates. <u>Lastly</u>, we can use it to add nodes with <code>append('circle')</code> and links with <code>append('path')</code>.</p>
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<a class="portfolio-link" href="graph/dendrogram_basic.html">
<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>Most basic dendrogram</p>
<hr>
<p class="explanation_portfolio">Most basic dendrogram. Built from a Json file.</p>
</div>
</div>
<img class="img-fluid" src="img/graph/dendrogram_basic.png" alt="">
</a>
</div>
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<a class="portfolio-link" href="graph/dendrogram_radial_basic.html">
<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>Basic radial dendrogram</p>
<hr>
<p class="explanation_portfolio">Very basic as well, but uses a radial layout instead of the linear</p>
</div>
</div>
<img class="img-fluid" src="img/graph/dendrogram_radial_basic.png" alt="">
</a>
</div>
</div>
<br><br><br><br>
<div class="mySeryTitle">Selection of blocks</div>
<hr>
<p>A few blocks with more complicated codes to showcase what's possible to do with hierarchical edge bundling.</p>
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<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>Transition tree / dendrogram</p>
<hr>
<p class="explanation_portfolio">A block illustrating the difference between tree and dendrogram, with smooth transition between both.</p>
</div>
</div>
<img class="img-fluid showBlock" src="img/block/block_dendrogramTransition.png" alt="Hierarchical edge bundling">
</a>
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<div class="portfolio-hover">
<div class="portfolio-hover-content">
<p>Dendrogram and barplot</p>
<hr>
<p class="explanation_portfolio">A block showing how to add a barplot next to dendrogram leaves.</p>
</div>
</div>
<img class="img-fluid showBlock" src="img/block/block_dendrogramBarplot.png" alt="Dendrogram and barplot">
</a>
</div>
</div>
</div>
</div>
</section>
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<div class="container">
<p class="mySeryTitle">Related chart types</p>
<hr>
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<i class="fa fa-plus fa-3x"></i>
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<div class="captionPortfolio">Chord diagram</div>
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<a class="portfolio-link" href="network.html">
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<div class="captionPortfolio">Arc diagram</div>
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<div class="captionPortfolio">Edge bundling</div>
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