title: how is axis indexed in numpy's array?
body: <p>From <a href="http://wiki.scipy.org/Tentative_NumPy_Tutorial">Numpy's tutorial</a>, axis can be indexed with integers, like <code>0</code> is for column, <code>1</code> is for row, but I don't grasp why they are indexed this way? And How do I figure out each axis' index when coping with multidimensional array?</p>