title: how to find mean of elements in a list of lists in R
body: <p>I have a list of lists like:</p>
  
  <pre><code>&gt; head(mylist)
  [[1]]
   [1] 0.000 0.067 0.400 0.733 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000
  [[2]]
   [1] 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.400 0.867 1.000
  [[3]]
   [1] 0.000 0.000 0.000 0.000 0.000 0.000 0.133 0.467 0.933 1.000 1.000 1.000 1.000
  [[4]]
   [1] 0.267 0.600 0.933 0.933 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000 1.000
  </code></pre>
  
  <p>and I would like to build a new vector that contains the element wise mean of each sublists element, like at the first place there should be the result of </p>
  
  <pre><code>mean(c(mylist[[1]][1], mylist[[2]][1], mylist[[3]][1], mylist[[4]][1])). 
  </code></pre>
  
  <p>I think it should be something along the line: </p>
  
  <pre><code>lapply(mylist, mean)
  </code></pre>
  
  <p>but in this case I just have the mean of each sublist.</p>