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dendrogram.html
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<!DOCTYPE html>
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<title>Dendrogram | the D3 Graph Gallery</title>
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<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">
<i class="fa fa-twitter"></i>
</a>
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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>
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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>
</div>
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class="portfolio-link"
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<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>
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<p class="mySeryTitle">Related chart types</p>
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<div class="captionPortfolio">Chord diagram</div>
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