How to make scipy.interpolate give an extrapolated result beyond the input range?

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As of SciPy version 0.17.0, there is a new option for scipy.interpolate.interp1d that allows extrapolation. Simply set fill_value=”extrapolate” in the call. Modifying your code in this way gives:

import numpy as np
from scipy import interpolate

x = np.arange(0,10)
y = np.exp(-x/3.0)
f = interpolate.interp1d(x, y, fill_value="extrapolate")

print f(9)
print f(11)

and the output is:

0.0497870683679
0.010394302658

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