> follows that of <code>install.packages</code>. If you already have ggplot2, reshape2, and dplyr on your computer, it’d be a good idea to check for updates before you use them:</p>
<pre class="sourceCode r"><code class="sourceCode r"><span class="kw">update.packages</span>(<span class="kw">c</span>(<span class="st">&quot;ggplot2&quot;</span>, <span class="st">&quot;reshape2&quot;</span>, <span class="st">&quot;dplyr&quot;</span>))</code></pre>
<p>You should start a new R session after updating packages. 