Spline curve smoothness is depending on the which kind of spline model is used. The smoothness of the spline curve is expressed as C_0, C_1, and so on. This representation represents continuity of the ...

plt.plot(x, spline(x, nu=1), '--', label='1st derivative') plt.plot(x, spline(x, nu=2), '--', label='2nd derivative') plt.plot(x, spline(x, nu=3), '--', label='3rd ...