title: How to convert a huge list-of-vector to a matrix more efficiently?
body: <p>I have a list of length 130,000 where each element is a character vector of length 110. I would like to convert this list to a matrix with dimension 1,430,000*10. How can I do it more efficiently?\
  My code is :</p>
  
  <pre><code>output=NULL
  for(i in 1:length(z)) {
   output=rbind(output,
                matrix(z[[i]],ncol=10,byrow=TRUE))
  }
  </code></pre>