<h1 id="null-and-na"><a aria-hidden="true" class="anchor-heading icon-link" href="#null-and-na"></a>Null and Na</h1>
<h2 id="null--na"><a aria-hidden="true" class="anchor-heading icon-link" href="#null--na"></a>Null &#x26; NA</h2>
<pre class="language-r"><code class="language-r"><span class="token comment"># empty value ----</span>

<span class="token keyword">NA</span> <span class="token comment">#NA is a logical constant of length 1 which contains a missing value indicator</span>

<span class="token keyword">NULL</span> <span class="token comment">#NULL represents the null object in R: </span>
<span class="token comment"># it is a reserved word. NULL is often returned by expressions and </span>
<span class="token comment"># functions whose value is undefined.</span>

?<span class="token keyword">NA</span>
</code></pre>

Null and Na


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