Python | Numpy NP . legfroroots()方法
原文:https://www . geesforgeks . org/python-numpy-NP-legfrom root-method/
**np.legfromroots()**方法用于生成给定根的勒让德级数。
语法:
np.legfromroots(roots)参数: 根:【array _ like】输入包含根的序列。返回:【n 数组】勒让德级数的一维系数数组。
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)
Output:
[-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)
Output:
[ -1.98000000e+02 3.25428571e+02 -1.58571429e+02 3.44444444e+01
-3.42857143e+00 1.26984127e-01]
