R: abc<-c(1:15) vs abcd<-1:15
<p>What is the difference between the following commands:</p>

<pre><code>abc &lt;- 1:15
abcd &lt;- c(1:15)
abc
abcd
</code></pre>

<p>The output is:</p>

<pre><code>&gt; abc &lt;- 1:15
&gt; abcd &lt;- c(1:15)
&gt; abc
 [1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
&gt; abcd
 [1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
</code></pre>