Python| Numpy np.lagfromroots() 方法

np.lagfromroots()方法用于生成具有给定根的拉盖尔级数。

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

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

代码#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) 

输出：

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

代码#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) 

输出：

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