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polyfit python

import numpy as np
x = np.array([0.0, 1.0, 2.0, 3.0,  4.0,  5.0])
y = np.array([0.0, 0.8, 0.9, 0.1, -0.8, -1.0])
z = np.polyfit(x, y, 3)#z=array([ 0.08703704, -0.81349206,  1.69312169, -0.03968254]) # may vary
p=np.poly1d(z) #p(0.5)=0.6143849206349179

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