mns</span>(city[, i], city[, i <span class="sc">+</span> <span class="dv">1</span>]), aberdeen_nairobi_func)</span>
<span id="cb404-11"><a href="loops.html#cb404-11" tabindex="-1"></a><span class="do">## Warning in multiply_columns(city[, i], city[, i + 1]): The function has</span></span>
<span id="cb404-12"><a href="loops.html#cb404-12" tabindex="-1"></a><span class="do">## produced NAs</span></span>
<span id="cb404-13"><a href="loops.html#cb404-13" tabindex="-1"></a><span class="do">## [1] TRUE</span></sp