how to convert a Series of arrays into a single matrix in pandas/numpy? : <p>I somehow got a <code>pandas.Series</code> which contains a bunch of arrays in it, as the <code>s</code> in the code below.</p>

<pre><code>data = [[1,2,3],[2,3,4],[3,4,5],[2,3,4],[3,4,5],[2,3,4],
        [3,4,5],[2,3,4],[3,4,5],[2,3,4],[3,4,5]]
s = pd.Series(data = data)
s.shape # output ---&gt; (11L,)
# try to convert s to matrix
sm = s.as_matrix()
# but...
sm.shape # output ---&gt; (11L,)
</code></pre>

<p>How can I convert the <code>s</code> into a matrix with shape (11,3)? Thanks!</p>
