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Python | Numpy np.lagfromroots()方法

原文:https://www . geeksforgeeks . org/python-numpy-NP-lagforroots-method/

**np.lagfromroots()**方法用于生成具有给定根的拉盖尔序列。

语法: np.lagfromroots(roots) 参数: 根:【array _ like】输入包含根的序列。

返回:【n 数组】拉盖尔级数的一维系数数组。

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) 

Output:

[-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) 

Output:

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



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