level="2.3" data-path="using-functions-in-r.html"><a href="using-functions-in-r.html"><i class="fa fa-check"></i><b>2.3</b> Using functions in R</a></li>
<li class="chapter" data-level="2.4" data-path="vectors.html"><a href="vectors.html"><i class="fa fa-check"></i><b>2.4</b> Working with vectors</a>
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<li class="chapter" data-level="2.4.1" data-path="vectors.html"><a href="vectors.html#extracting-elements"><i class="fa fa-check"></i><b>2.4.1</b> Extracting elements</a></li>
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