title: How come when a Series is passed to Numpy's exp() function, a Series is returned?
body: <p>Unless numpy itself is programmed to return a Series when a Series is passed to it, it is very confusing. yet the <a href="https://docs.scipy.org/doc/numpy-1.15.0/reference/generated/numpy.exp.html" rel="nofollow noreferrer">documentation</a> on this function doesn't mention that it returns a Series when a Series is passed to it. </p>
  
  <p>Understand that i come from a java background and i am new to python. </p>