Python | Numpy np.cheb2poly() method (original) (raw)

Last Updated : 03 Nov, 2019

With the help of **np.cheb2poly()** method, we can get the polynomial from chebyshev series by using np.cheb2poly() method.

Syntax : np.cheb2poly(array)
Return : Return array having coefficients of polynomial.

Example #1 :
In this example we can see that by using np.cheb2poly() method, we are able to get the polynomial from chebyshev series by using this method.

import numpy as np

from numpy import polynomial as P

x = np.array([ 2 , 5 , 7 ])

gfg = P.Chebyshev(x)

gfg = gfg.convert(kind = P.Polynomial)

gfg = P.chebyshev.cheb2poly(gfg)

print (gfg)

[Polynomial([-5., 5., 14.], domain=[-1., 1.], window=[-1., 1.])]

Example #2 :

import numpy as np

from numpy import polynomial as P

x = np.array([ 2 , 3 , 5 , 7 , 11 ])

gfg = P.Chebyshev(x)

gfg = gfg.convert(kind = P.Polynomial)

gfg = P.chebyshev.cheb2poly(gfg)

print (gfg)

[Polynomial([8., -18., -78., 28., 88.], domain=[-1., 1.], window=[-1., 1.])]

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