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- # Lagrange koji apr. f-ju f(x)=(1+x**3)*cos(pi*x)
- # čvorovi su vrijed. 0,0.7... itd. iz čvorovi.txt
- # izračunajte apsolutnu grešku aprox. u čvoru x=1
- from numpy import *
- import numpy as np
- from scipy import interpolate as i
- def f(x):
- return (1+x**3)*cos(pi*x)
- x = array([0,0.7,1.1,1.8,2.7,3.1,4])
- print (x)
- y=f(x)
- print (y)
- pl=i.lagrange(x,y)
- print (pl)
- print ('apsolutna greska aproksimacije u x=1: ', abs(f(1)-pl(1)))
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