title: Fast way of converting large list to dataframe
body: <p>I have a huge list (700 elements), each element being a vector of length = 16,000.
  I am looking for an efficient way of converting the list to a dataframe, in the following fashion (this is just a mock example):</p>
  
  <pre><code>lst &lt;- list(a = c(1,2,3), b = c(4,5,6), c = c(7,8,9))
  </code></pre>
  
  <p>The end result I am looking for is:</p>
  
  <pre><code> #  [,1] [,2] [,3]
   #a    1    2    3
   #b    4    5    6
   #c    7    8    9
  </code></pre>
  
  <p>This is what I have tried, but isn't working as I wish:</p>
  
  <pre><code>library(data.table)
  result = rbindlist(Map(as.data.frame, lst))
  </code></pre>
  
  <p>Any suggestion? Please keep in mind that my real example has huge dimensions, and I would need a rather efficient way of doing this operation.</p>
  
  <p>Thank you very much!</p>