span></span></code></pre></div>
<p>Whereas the base equivalent silently uses just the first value:</p>
<div class="sourceCode" id="cb10"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb10-1"><a href="#cb10-1" tabindex="-1"></a><span class="fu">substr</span>(hw, <span class="at">start =</span> <span class="dv">1</span><span class="sc">:</span><span class="dv">5</span>, <span class="at">stop =</span> <span class="dv">15</span>)</span>
<span id="cb10-2"><a href="#cb10-2" tabindex="-1"></a><spa