Python | Numpy np.polyroots() method

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]