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holtzy 提交于 2019-08-22 19:37 +08:00 . --- :) ---
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<center><h1>Most basic Sankey Diagram</h1></center>
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<center><p style="max-width: 600px; margin-top: 40px"><a href="sankey-diagram.html">Sankey Diagram</a> can be built in <code>R</code> using the <code>networkD3</code> package. This posts displays basic example, focusing on the different input formats that can be used.</p></center>
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<p>A <a href="sankey-diagram.html">Sankey diagram</a> represents flows, i.e. weigthed connections going from one node to another. Input data can be stored in 2 different formats:</p>
<ul>
<li>connection data frame (3 columns)</li>
<li>incidence matrix (square matrix)</li>
</ul>
<p>This post describes how to build a basic Sankey diagram from these 2 types of input.</p>
<h1 id="from-connection-data-frame">From connection data frame</h1>
<hr />
<div class="row">
<div class="col-md-5 col-sm-12 align-self-center">
<p>A connection data frame lists all the connections one by one in a data frame.</p>
<p>Usually you have a <code>source</code> and a <code>target</code> column. You can add a third column that gives further information for each connection, like the value of the flow.</p>
<p>This is the format you need to use the <code>networkD3</code> library. Let’s build a connection data frame and represent it as a Sankey diagram:</p>
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<iframe src="HtmlWidget/sankeyBasic1.html" height="440" width="100%" style="border:none;">
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<div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb1-1" data-line-number="1"><span class="co"># Library</span></a>
<a class="sourceLine" id="cb1-2" data-line-number="2"><span class="kw">library</span>(networkD3)</a>
<a class="sourceLine" id="cb1-3" data-line-number="3"><span class="kw">library</span>(dplyr)</a>
<a class="sourceLine" id="cb1-4" data-line-number="4"> </a>
<a class="sourceLine" id="cb1-5" data-line-number="5"><span class="co"># A connection data frame is a list of flows with intensity for each flow</span></a>
<a class="sourceLine" id="cb1-6" data-line-number="6">links &lt;-<span class="st"> </span><span class="kw">data.frame</span>(</a>
<a class="sourceLine" id="cb1-7" data-line-number="7"> <span class="dt">source=</span><span class="kw">c</span>(<span class="st">&quot;group_A&quot;</span>,<span class="st">&quot;group_A&quot;</span>, <span class="st">&quot;group_B&quot;</span>, <span class="st">&quot;group_C&quot;</span>, <span class="st">&quot;group_C&quot;</span>, <span class="st">&quot;group_E&quot;</span>), </a>
<a class="sourceLine" id="cb1-8" data-line-number="8"> <span class="dt">target=</span><span class="kw">c</span>(<span class="st">&quot;group_C&quot;</span>,<span class="st">&quot;group_D&quot;</span>, <span class="st">&quot;group_E&quot;</span>, <span class="st">&quot;group_F&quot;</span>, <span class="st">&quot;group_G&quot;</span>, <span class="st">&quot;group_H&quot;</span>), </a>
<a class="sourceLine" id="cb1-9" data-line-number="9"> <span class="dt">value=</span><span class="kw">c</span>(<span class="dv">2</span>,<span class="dv">3</span>, <span class="dv">2</span>, <span class="dv">3</span>, <span class="dv">1</span>, <span class="dv">3</span>)</a>
<a class="sourceLine" id="cb1-10" data-line-number="10"> )</a>
<a class="sourceLine" id="cb1-11" data-line-number="11"> </a>
<a class="sourceLine" id="cb1-12" data-line-number="12"><span class="co"># From these flows we need to create a node data frame: it lists every entities involved in the flow</span></a>
<a class="sourceLine" id="cb1-13" data-line-number="13">nodes &lt;-<span class="st"> </span><span class="kw">data.frame</span>(</a>
<a class="sourceLine" id="cb1-14" data-line-number="14"> <span class="dt">name=</span><span class="kw">c</span>(<span class="kw">as.character</span>(links<span class="op">$</span>source), </a>
<a class="sourceLine" id="cb1-15" data-line-number="15"> <span class="kw">as.character</span>(links<span class="op">$</span>target)) <span class="op">%&gt;%</span><span class="st"> </span><span class="kw">unique</span>()</a>
<a class="sourceLine" id="cb1-16" data-line-number="16">)</a>
<a class="sourceLine" id="cb1-17" data-line-number="17"> </a>
<a class="sourceLine" id="cb1-18" data-line-number="18"><span class="co"># With networkD3, connection must be provided using id, not using real name like in the links dataframe.. So we need to reformat it.</span></a>
<a class="sourceLine" id="cb1-19" data-line-number="19">links<span class="op">$</span>IDsource &lt;-<span class="st"> </span><span class="kw">match</span>(links<span class="op">$</span>source, nodes<span class="op">$</span>name)<span class="op">-</span><span class="dv">1</span> </a>
<a class="sourceLine" id="cb1-20" data-line-number="20">links<span class="op">$</span>IDtarget &lt;-<span class="st"> </span><span class="kw">match</span>(links<span class="op">$</span>target, nodes<span class="op">$</span>name)<span class="op">-</span><span class="dv">1</span></a>
<a class="sourceLine" id="cb1-21" data-line-number="21"> </a>
<a class="sourceLine" id="cb1-22" data-line-number="22"><span class="co"># Make the Network</span></a>
<a class="sourceLine" id="cb1-23" data-line-number="23">p &lt;-<span class="st"> </span><span class="kw">sankeyNetwork</span>(<span class="dt">Links =</span> links, <span class="dt">Nodes =</span> nodes,</a>
<a class="sourceLine" id="cb1-24" data-line-number="24"> <span class="dt">Source =</span> <span class="st">&quot;IDsource&quot;</span>, <span class="dt">Target =</span> <span class="st">&quot;IDtarget&quot;</span>,</a>
<a class="sourceLine" id="cb1-25" data-line-number="25"> <span class="dt">Value =</span> <span class="st">&quot;value&quot;</span>, <span class="dt">NodeID =</span> <span class="st">&quot;name&quot;</span>, </a>
<a class="sourceLine" id="cb1-26" data-line-number="26"> <span class="dt">sinksRight=</span><span class="ot">FALSE</span>)</a>
<a class="sourceLine" id="cb1-27" data-line-number="27">p</a>
<a class="sourceLine" id="cb1-28" data-line-number="28"></a>
<a class="sourceLine" id="cb1-29" data-line-number="29"><span class="co"># save the widget</span></a>
<a class="sourceLine" id="cb1-30" data-line-number="30"><span class="co"># library(htmlwidgets)</span></a>
<a class="sourceLine" id="cb1-31" data-line-number="31"><span class="co"># saveWidget(p, file=paste0( getwd(), &quot;/HtmlWidget/sankeyBasic1.html&quot;))</span></a></code></pre></div>
<h1 id="from-incidence-matrix">From incidence matrix</h1>
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<p>An incidence matrix is square or rectangle.</p>
<p>Row and column names are node names. The item in row x and column y represents the flow between x and y. In the Sankey diagram we represent all flows that are over 0.</p>
<p>Since the <code>networkD3</code> library expects a connection data frame, we will fist convert the dataset, and then re-use the code from above.</p>
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<center>
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<div class="sourceCode" id="cb2"><pre class="sourceCode r"><code class="sourceCode r"><a class="sourceLine" id="cb2-1" data-line-number="1"><span class="co"># Library</span></a>
<a class="sourceLine" id="cb2-2" data-line-number="2"><span class="kw">library</span>(networkD3)</a>
<a class="sourceLine" id="cb2-3" data-line-number="3"><span class="kw">library</span>(dplyr)</a>
<a class="sourceLine" id="cb2-4" data-line-number="4"> </a>
<a class="sourceLine" id="cb2-5" data-line-number="5"><span class="co"># Create an incidence matrix. Usually the flow goes from the row names to the column names.</span></a>
<a class="sourceLine" id="cb2-6" data-line-number="6"><span class="co"># Remember that our connection are directed since we are working with a flow.</span></a>
<a class="sourceLine" id="cb2-7" data-line-number="7"><span class="kw">set.seed</span>(<span class="dv">1</span>)</a>
<a class="sourceLine" id="cb2-8" data-line-number="8">data &lt;-<span class="st"> </span><span class="kw">matrix</span>(<span class="kw">sample</span>( <span class="kw">seq</span>(<span class="dv">0</span>,<span class="dv">40</span>), <span class="dv">49</span>, <span class="dt">replace=</span>T ), <span class="dv">7</span>, <span class="dv">7</span>)</a>
<a class="sourceLine" id="cb2-9" data-line-number="9">data[data <span class="op">&lt;</span><span class="st"> </span><span class="dv">35</span>] &lt;-<span class="st"> </span><span class="dv">0</span></a>
<a class="sourceLine" id="cb2-10" data-line-number="10"><span class="kw">colnames</span>(data) =<span class="st"> </span><span class="kw">rownames</span>(data) =<span class="st"> </span><span class="kw">c</span>(<span class="st">&quot;group_A&quot;</span>, <span class="st">&quot;group_B&quot;</span>, <span class="st">&quot;group_C&quot;</span>, <span class="st">&quot;group_D&quot;</span>, <span class="st">&quot;group_E&quot;</span>, <span class="st">&quot;group_F&quot;</span>, <span class="st">&quot;group_G&quot;</span>)</a>
<a class="sourceLine" id="cb2-11" data-line-number="11"></a>
<a class="sourceLine" id="cb2-12" data-line-number="12"><span class="co"># Transform it to connection data frame with tidyr from the tidyverse:</span></a>
<a class="sourceLine" id="cb2-13" data-line-number="13">links &lt;-<span class="st"> </span>data <span class="op">%&gt;%</span><span class="st"> </span></a>
<a class="sourceLine" id="cb2-14" data-line-number="14"><span class="st"> </span><span class="kw">as.data.frame</span>() <span class="op">%&gt;%</span><span class="st"> </span></a>
<a class="sourceLine" id="cb2-15" data-line-number="15"><span class="st"> </span><span class="kw">rownames_to_column</span>(<span class="dt">var=</span><span class="st">&quot;source&quot;</span>) <span class="op">%&gt;%</span><span class="st"> </span></a>
<a class="sourceLine" id="cb2-16" data-line-number="16"><span class="st"> </span><span class="kw">gather</span>(<span class="dt">key=</span><span class="st">&quot;target&quot;</span>, <span class="dt">value=</span><span class="st">&quot;value&quot;</span>, <span class="dv">-1</span>) <span class="op">%&gt;%</span></a>
<a class="sourceLine" id="cb2-17" data-line-number="17"><span class="st"> </span><span class="kw">filter</span>(value <span class="op">!=</span><span class="st"> </span><span class="dv">0</span>)</a>
<a class="sourceLine" id="cb2-18" data-line-number="18"> </a>
<a class="sourceLine" id="cb2-19" data-line-number="19"><span class="co"># From these flows we need to create a node data frame: it lists every entities involved in the flow</span></a>
<a class="sourceLine" id="cb2-20" data-line-number="20">nodes &lt;-<span class="st"> </span><span class="kw">data.frame</span>(</a>
<a class="sourceLine" id="cb2-21" data-line-number="21"> <span class="dt">name=</span><span class="kw">c</span>(<span class="kw">as.character</span>(links<span class="op">$</span>source), <span class="kw">as.character</span>(links<span class="op">$</span>target)) <span class="op">%&gt;%</span><span class="st"> </span></a>
<a class="sourceLine" id="cb2-22" data-line-number="22"><span class="st"> </span><span class="kw">unique</span>()</a>
<a class="sourceLine" id="cb2-23" data-line-number="23"> )</a>
<a class="sourceLine" id="cb2-24" data-line-number="24"> </a>
<a class="sourceLine" id="cb2-25" data-line-number="25"><span class="co"># With networkD3, connection must be provided using id, not using real name like in the links dataframe.. So we need to reformat it.</span></a>
<a class="sourceLine" id="cb2-26" data-line-number="26">links<span class="op">$</span>IDsource &lt;-<span class="st"> </span><span class="kw">match</span>(links<span class="op">$</span>source, nodes<span class="op">$</span>name)<span class="op">-</span><span class="dv">1</span> </a>
<a class="sourceLine" id="cb2-27" data-line-number="27">links<span class="op">$</span>IDtarget &lt;-<span class="st"> </span><span class="kw">match</span>(links<span class="op">$</span>target, nodes<span class="op">$</span>name)<span class="op">-</span><span class="dv">1</span></a>
<a class="sourceLine" id="cb2-28" data-line-number="28"> </a>
<a class="sourceLine" id="cb2-29" data-line-number="29"><span class="co"># Make the Network</span></a>
<a class="sourceLine" id="cb2-30" data-line-number="30">p &lt;-<span class="st"> </span><span class="kw">sankeyNetwork</span>(<span class="dt">Links =</span> links, <span class="dt">Nodes =</span> nodes,</a>
<a class="sourceLine" id="cb2-31" data-line-number="31"> <span class="dt">Source =</span> <span class="st">&quot;IDsource&quot;</span>, <span class="dt">Target =</span> <span class="st">&quot;IDtarget&quot;</span>,</a>
<a class="sourceLine" id="cb2-32" data-line-number="32"> <span class="dt">Value =</span> <span class="st">&quot;value&quot;</span>, <span class="dt">NodeID =</span> <span class="st">&quot;name&quot;</span>, </a>
<a class="sourceLine" id="cb2-33" data-line-number="33"> <span class="dt">sinksRight=</span><span class="ot">FALSE</span>)</a>
<a class="sourceLine" id="cb2-34" data-line-number="34"></a>
<a class="sourceLine" id="cb2-35" data-line-number="35">p</a>
<a class="sourceLine" id="cb2-36" data-line-number="36"></a>
<a class="sourceLine" id="cb2-37" data-line-number="37"><span class="co"># save the widget</span></a>
<a class="sourceLine" id="cb2-38" data-line-number="38"><span class="co"># library(htmlwidgets)</span></a>
<a class="sourceLine" id="cb2-39" data-line-number="39"><span class="co"># saveWidget(p, file=paste0( getwd(), &quot;/HtmlWidget/sankeyBasic2.html&quot;))</span></a></code></pre></div>
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<a href="https://www.linkedin.com/in/yan-holtz-2477534a/">
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<a href="#">Privacy Policy</a>
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<script>
// add bootstrap table styles to pandoc tables
function bootstrapStylePandocTables() {
$('tr.header').parent('thead').parent('table').addClass('table table-condensed');
}
$(document).ready(function () {
bootstrapStylePandocTables();
});
</script>
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<script src="vendor/bootstrap/js/bootstrap.bundle.min.js"></script>
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R-graph-gallery
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