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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