How to perform cubic spline interpolation in python?

Question

Consider I have two lists, for describing the function y(x):

x = [0,1,2,3,4,5]

y = [12,14,22,39,58,77]

To give some value 'w' in the domain of x, I'm going to perform cubic spline interpolation.

w=1.25

I can find y(w)

I found this through Scipy, But I don't know how to use it.

python scipy interpolation spline cubic-spline

Answer 1

Look at the following code,

from scipy import interpolate

def f(x):

    x_points = [ 0, 1, 2, 3, 4, 5]

    y_points = [12,14,22,39,58,77]

    tck = interpolate.splrep(x_points, y_points)

    return interpolate.splev(x, tck)

print(f(1.25))

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