Python| Numpy np.legfromroots() 方法

np.legfromroots()方法用于生成具有给定根的Legendre系列。

Syntax : np.legfromroots(roots)
Parameters:
roots :[array_like] Input sequence containing the roots.

Return : [ndarray] 1-D array of coefficients of legendre series.

代码#1：

# 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) 

输出：

[-68.66666667  56.6         -9.33333333   0.4       ]

代码#2：

# 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) 

输出：

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