title: Combining variable and output number in R
body: <p>if i have data list such as</p>
  <pre><code>a = c(1,2,3,4)
  </code></pre>
  <p>and</p>
  <pre><code>b3 = 400
  </code></pre>
  <p>how to make a new variable by combining the letter &quot;b&quot; and output a[3] so when I run it, it appears as b3 = 400</p>