Python | Numpy np.legfromroots() method

Python | Numpy np.lagfromroots() method

Last Updated : 29 Dec, 2019

np.lagfromroots() method is used to generate a Laguerre series with given roots.

Syntax : np.lagfromroots(roots) Parameters: roots :[array_like] Input sequence containing the roots. Return : [ndarray] 1-D array of coefficients of Laguerre series.

Code #1 :

Python3

# Python program explaining
# numpy.lagfromroots() method 
  
# importing numpy as np  
# and numpy.polynomial.laguerre module as geek 
import numpy as np 
import numpy.polynomial.laguerre as geek
  
# Input roots

roots = (2, 4, 8) 
   
# using np.lagfromroots() method 
res = geek.lagfromroots(roots) 

# Resulting laguerre series coefficient
print (res)

Output:

[-30. -18. -10.  -6.]

Code #2 :

Python3

# Python program explaining
# numpy.lagfromroots() method 
  
# importing numpy as np  
# and numpy.polynomial.laguerre module as geek 
import numpy as np 
import numpy.polynomial.laguerre as geek
  
# Input roots
s = (1, 2, 3, 4, 5) 

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

# Resulting laguerre series coefficient
print (res)

Output:

[ -26.  -64.  120. -270.  240. -120.]

Python | Numpy np.legfromroots() method

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