Für das Polynom 3x3 -2x2 + 2x +1 berechnen wir f(3):
>>> np.polyval([3,-2,2,1], 3)
70
>>>
Regression (mittels Methode der kleinsten Quadrate):
>>> x = [-3, -1, 0, 1, 3]
>>> y = [9,1,0,1,9]
>>> np.polyfit(x,y,2)
array([ 1.00000000e+00, -8.75052981e-18, 0.00000000e+00])
>>> y = [12,4,3,4,12]
>>> np.polyfit(x,y,2)
array([ 1.00000000e+00, -7.40148683e-16, 3.00000000e+00])
>>>