external-link">seq</a></span><span class="op">(</span><span class="fl">1000</span>, <span class="fl">15000</span>, <span class="fl">1000</span><span class="op">)</span></span></span>
<span class="r-in"><span>  <span class="op">)</span></span></span>
<span class="r-in"><span>  <span class="fu">doGRASS</span><span class="op">(</span><span class="st">"r.buffer"</span>, flags <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</