splder(tck, n=1)
Spline whose derivative to compute
Order of derivative to evaluate. Default: 1
Spline of order k2=k-n representing the derivative of the input spline. A tuple is returned iff the input argument tck is a tuple, otherwise a BSpline object is constructed and returned.
Compute the spline representation of the derivative of a given spline
from scipy.interpolate import splrep, splder, sproot
import numpy as np
x = np.linspace(0, 10, 70)
y = np.sin(x)
spl = splrep(x, y, k=4)
dspl = splder(spl)
sproot(dspl) / np.pi
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