Python | Numpy np.lagroots() method

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

Syntax : np.lagroots(c)
Parameters:
c :[array_like] 1-D arrays of Laguerre series coefficients ordered from low to high.

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.lagroots() method

# importing numpy as np
# and numpy.polynomial.laguerre module as geek
import numpy as np
import numpy.polynomial.laguerre as geek

# Input laguerre series coefficients

s = (2, 4, 8)

# using np.lagroots() method
res = geek.lagroots(s)

# Resulting laguerre series coefficient
print (res)

Output:

[ 0.8416876  4.1583124]

Code #2 :

# Python program explaining
# numpy.lagroot() method

# importing numpy as np
# and numpy.polynomial.laguerre module as geek
import numpy as np
import numpy.polynomial.laguerre as geek

# Laguerre series coefficients
s = (1, 2, 3, 4, 5)


# using np.lagroots() method
res = geek.lagroots(s)

# Resulting laguerre series
print (res)

Output:

[  0.50680523   2.37919156   5.5446037   10.76939951]