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Python | Numpy np.polyroots() method

  • Last Updated : 31 Dec, 2019

np.polyroots() method is used to compute the roots of a polynomial series.Return the roots of the polynomial.

Syntax : np.polyroots(c)
Parameters:
c :[array_like] 1-D arrays of polynomial series coefficients.

Return : [ndarray] Array of the roots of the series. If all the roots are real, then out is also real, otherwise it is complex.

Code #1 :




# Python program explaining
# numpy.polyroots() method 
    
# importing numpy as np  
# and numpy.polynomial.polynomial module as geek 
import numpy as np 
import numpy.polynomial.polynomial as geek
    
# Input polynomial series coefficients
  
s = (2, 4, 8
     
# using np.polyroots() method 
res = geek.polyroots(s) 
  
# Resulting polynomial series coefficient
print (res) 
Output:



[-0.25-0.4330127j -0.25+0.4330127j]

 

Code #2 :




# Python program explaining
# numpy.polyroot() method 
    
# importing numpy as np  
# and numpy.polynomial.polynomial module as geek 
import numpy as np 
import numpy.polynomial.polynomial as geek
    
# polynomial series coefficients
s = (1, 2, 3, 4, 5
  
    
# using np.polyroots() method 
res = geek.polyroots(s) 
  
# Resulting polynomial series
print (res) 
Output:
[-0.53783227-0.35828469j -0.53783227+0.35828469j  0.13783227-0.67815439j
  0.13783227+0.67815439j]

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