">1</span>,<span class="num">2</span>,<span class="num">3</span>), <span class="lit">'b'</span>-&gt;Vec(<span class="num">4</span>,<span class="num">5</span>,<span class="num">6</span>))</pre><p>The <code>apply</code> method takes a row and col key returns a slice of the original Frame:</p><pre>f(<span class="num">0</span>,<span class="lit">'a'</span>) == Frame(<span class="lit">'a'</span>-&gt;Vec(<span class="num">1</span>))</pre><p><code>apply</code> also accepts a <a href="index/Slice.html" class="extype