me_from_column"</span>,
  value <span class='op'>=</span> <span class='st'>"value_was"</span>,
  columns <span class='op'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span><span class='op'>(</span><span class='st'>"measurement1"</span>, <span class='st'>"measurement2"</span><span class='op'>)</span><span class='op'>)</span>
</div><div class='output co'>#&gt;   id value_came_from_column value_was
#&gt; 1  1           measurement1         a
#&gt; 2  2           measurement1        