title: column max with list of matrices
body: <p>Given a list of numpy <code>2d</code>-arrays of size <code>mxn</code>, what is the best way to get an array of size <code>n</code> (number of columns of each matrix in the list) where the <code>i</code>-the value of the array is the maximum of column <code>i</code>, across all matrices in the list?</p>