Average a list of matrix : <p>For example, I have a list of matrix like this </p>

<pre><code>list2&lt;-lapply(1:2, function(x) matrix(rnorm(6, 10, 1), nrow=2, ncol=3))
list2
</code></pre>

<p>How do I get a matrix which has the same size with each matrix in each list, and the value in each cell equal to the average of corresponding cell across lists. </p>
