can manipulate the data only at specific columns as shown here:</p>
<div class="sourceCode" id="cb33"><pre class="downlit sourceCode r">
<code class="sourceCode R"><span class="fu"><a href="https://rdrr.io/r/utils/head.html" class="external-link">head</a></span><span class="op">(</span><span class="fu"><a href="reference/recode_na_as.html">recode_na_as</a></span><span class="op">(</span><span class="va">airquality</span>, value<span class="op">=</span><span class="fl">0</span>, subset_cols<span class="op">=