eve error message</span></span></span>
<span class="r-in"><span>  <span class="kw">if</span> <span class="op">(</span><span class="va">res</span> <span class="op">!=</span> <span class="fl">0</span><span class="op">)</span> <span class="op">{</span></span></span>
<span class="r-in"><span>    <span class="va">resERR</span> <span class="op">&lt;-</span> <span class="fu">execGRASS</span><span class="op">(</span></span></span>
<span class="r-in"><span>      <span class="st">"r.stats"</span>,</span></span>
<span