   6.2         3.4          5.4
#&gt; 150:          5.9         3.0          5.1</div><div class='input'><span class='no'>iris</span> <span class='kw'>%&gt;%</span> <span class='fu'>select_dt</span>(<span class='fl'>1</span>,<span class='fl'>3</span>)</div><div class='output co'>#&gt;      Sepal.Length Petal.Length
#&gt;   1:          5.1          1.4
#&gt;   2:          4.9          1.4
#&gt;   3:          4.7          1.3
#&gt;   4:          4.6          1.5
#&gt;   5:          5.0          1.4
#&g