Python | Numpy np.lagfromroots() method

Python | Numpy np.legfromroots() method

Last Updated : 31 Dec, 2019

np.legfromroots() method is used to generate a legendre series with given roots.

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

Code #1 :

Python3

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

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

# Resulting legendre series coefficient
print (res)

Output:

[-68.66666667  56.6         -9.33333333   0.4       ]

Code #2 :

Python3

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

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

# Resulting legendre series coefficient
print (res)

Output:

[ -1.98000000e+02   3.25428571e+02  -1.58571429e+02   3.44444444e+01
  -3.42857143e+00   1.26984127e-01]

Python | Numpy np.lagfromroots() method

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