//rdrr.io/r/base/library.html" class="external-link">library</a></span><span class="op">(</span><span class="va"><a href="https://terminological.github.io/dtrackr/index.html">dtrackr</a></span><span class="op">)</span></span></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># mutate and other functions are unitary operations that generally change</span></span></span>
<span class="r-in"><span><span class="co"># the structure but not size of a dataframe. In dtrackr thes