title: how do you combine two large vectors of different sizes into a single tibble?
body: <p>I have two vectors, x and y, of different lengths. I want a tibble where every value of x is repeated for every value of y.</p>
  <pre><code>x &lt;- c(&quot;a&quot;, &quot;b&quot;) 
  y &lt;- c(1, 2, 3)
  </code></pre>
  <p>example tibble:</p>
  <pre><code>x   y
  a   1           
  a   2           
  a   3           
  b   1           
  b   2           
  b   3           
  </code></pre>