n class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="op">-</span><span class="fl">9999</span>,<span class="op">-</span><span class="fl">4444</span><span class="op">)</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span> $Message</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> [1] "ERROR: some variables have non-encoded missing value codes."</span>
<sp