Python | Numpy np.legroots() method

Python | Numpy np.lagroots() method

Last Updated : 29 Dec, 2019

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 :

Python3

# 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 :

Python3

# 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]

Python | Numpy np.legroots() method

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