Python Numpy np.lagfromroots()方法
np.lagfromroots()方法用于生成具有给定根的拉格尔数列。
语法: np.lagfromroots(roots)
参数:
roots : [array_like] 包含根的输入序列。
返回: [ndarray] 拉盖尔级数的系数的一维数组。
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)
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.]