n class="no">n</span>), <span class="no">cas</span> ][<span class="fl">1</span>:<span class="fl">20</span>]
<span class="no">dat</span> <span class="kw">=</span> <span class="no">dat</span>[ <span class="no">cas</span> <span class="kw">%in%</span> <span class="no">cas20</span> ]</pre></div>
<div class="sourceCode" id="cb10"><pre class="r"><span class="fu"><a href="https://rdrr.io/r/base/library.html">require</a></span>(<span class="no">ggplot2</span>)
<span class="fu"><a href="https://ggplot2.tidyverse.org/