an>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="fu">getCountryName</span><span class="op">(</span><span class="va">longitude</span>, <span class="va">latitude</span><span class="op">)</span></span></span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  [1] NA           NA           NA           "Nigeria"    "Nigeria"   </span>
<span class="r-out co"><span class="r-pr">#&gt;</span>  [6] "Nigeria"    "Nigeria"    "Nigeria"    "Nigeria"    "Nigeria"   </span>
<span cla