Python | Numpy np.polyfromroots() method

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 :

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# 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 :

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# 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.]




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