Question over the usage of rint
<pre><code>for(i = 0; i &lt; 181; i++)
    {
       unsigned int index = rint(i/db);
        assert(index &gt;= 0 &amp;&amp; index &lt; data.ranges_count);
      this-&gt;laser_ranges[i*2][0] = data.ranges[index] * 1e3;
    }
</code></pre>

<p>what is the meaning of  <code>rint(i/db)</code>? I am not sure how rint is used...</p>
