ass='op'>(</span>USUBJID <span class='op'>=</span> <span class='fl'>1</span>,
                 TUDTC <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='fu'><a href='https://rdrr.io/r/base/rep.html'>rep</a></span><span class='op'>(</span><span class='st'>"2016-01-01"</span>,<span class='fl'>3</span><span class='op'>)</span>, <span class='fu'><a href='https://rdrr.io/r/base/rep.html'>rep</a></span><span class='op'>(</span><span 