title: Is there a "wrap" function in R?
body: <p>I was reading code on this page:
  <a href="https://github.com/ggobi/ggally/issues/31" rel="nofollow">https://github.com/ggobi/ggally/issues/31</a></p>
  
  <pre><code>upper = list(continuous = wrap("cor", size = 9))
  </code></pre>
  
  <p>Has anyone heard of a function called <code>wrap</code>? I always get:</p>
  
  <blockquote>
    <p>error: could not find function "wrap"</p>
  </blockquote>
  
  <p>It does not belong to <code>base</code> package. </p>