Python | Numpy np.legroots() 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 :

# 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 :

# 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.legroots() method

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