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Return Pade approximation to a polynomial as the ratio of two polynomials.
Parameters
----------
an : (N,) array_like
Taylor series coefficients.
m : int
The order of the returned approximating polynomial `q`.
n : int, optional
The order of the returned approximating polynomial `p`. By default,
the order is ``len(an)-1-m``.
Returns
-------
p, q : Polynomial class
The Pade approximation of the polynomial defined by `an` is
``p(x)/q(x)``.
Examples
--------
>>> import numpy as np
>>> from scipy.interpolate import pade
>>> e_exp = [1.0, 1.0, 1.0/2.0, 1.0/6.0, 1.0/24.0, 1.0/120.0]
>>> p, q = pade(e_exp, 2)
>>> e_exp.reverse()
>>> e_poly = np.poly1d(e_exp)
Compare ``e_poly(x)`` and the Pade approximation ``p(x)/q(x)``
>>> e_poly(1)
2.7166666666666668
>>> p(1)/q(1)
2.7179487179487181
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