/" class="external-link">GitHub</a> using the following code (If you are using Windows, it is necessary to install <a href="https://cran.r-project.org/bin/windows/Rtools/" class="external-link">Rtools</a> beforehand).</p>
<div class="sourceCode" id="cb2"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span><span class="kw">if</span> <span class="op">(</span><span class="op">!</span><span class="kw"><a href="https://rdrr.io/r/base/library.html" class="external-link">require</a></span><span cla