[Numpy-discussion] confused about univaritespline
Neal Becker
ndbecker2@gmail....
Tue Nov 20 13:11:38 CST 2012
I don't understand why the plot of the spline continues on a negative slope at
the end, but the plot of the integral of it flattens.
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import numpy as np
import matplotlib.pyplot as plt
ibo = np.array ((12, 14, 16, 18, 20, 22, 24, 26, 28, 29, 29.8, 30.2))
gain_deriv = np.array ((0, 0, 0, 0, 0, 0, .2, .4, .5, .5, 0, -2))
import scipy.interpolate
s = scipy.interpolate.UnivariateSpline(ibo, gain_deriv, s=0.1)
xs = linspace(12, 31, 100)
gain = np.vectorize (lambda x: s.integral (12, x)) (xs)
plot (xs, s(xs))
plot (xs, gain)
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