np.polyfromroots()
method is used to generate a polynomial series with given roots.
Syntax :
np.polyfromroots(roots)
Parameters:
roots :[array_like] Input sequence containing the roots.Return : [ndarray] 1-D array of coefficients of polynomial series.
Code #1 :
# Python program explaining # numpy.polyfromroots() method # importing numpy as np # and numpy.polynomial.polynomial module as geek import numpy as np
import numpy.polynomial.polynomial as geek
# Input roots roots = ( 2 , 4 , 8 )
# using np.polyfromroots() method res = geek.polyfromroots(roots)
# Resulting polynomial series coefficient print (res)
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Output:
[-64. 56. -14. 1.]
Code #2 :
# Python program explaining # numpy.polyfromroots() method # importing numpy as np # and numpy.polynomial.polynomial module as geek import numpy as np
import numpy.polynomial.polynomial as geek
# Input roots s = ( 1 , 2 , 3 , 4 , 5 )
# using np.polyfromroots() method res = geek.polyfromroots(s)
# Resulting polynomial series coefficient print (res)
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Output:
[-120. 274. -225. 85. -15. 1.]