title: dplyr summarise() with multiple return values from a single function
body: <p>I am wondering if there is a way to use functions with <code>summarise</code> (<code>dplyr 0.1.2</code>) that return multiple values (for instance the <code>describe</code> function from <code>psych</code> package).</p>
  <p>If not, is it just because it hasn't been implemented yet, or is there a reason that it wouldn't be a good idea?</p>
  <p>Example:</p>
  <pre><code>require(psych)
  require(ggplot2)
  require(dplyr)
  
  dgrp &lt;- group_by(diamonds, cut)
  describe(dgrp$price)
  summarise(dgrp, describe(price))
  </code></pre>
  <p>produces: <code>Error: expecting a single value</code></p>