Python | Numpy NP . poly root()方法
原文:https://www . geesforgeks . org/python-numpy-NP-poly root-method/
**np.polyroots()**方法用于计算一个多项式序列的根。返回多项式的根。
语法:
np.polyroots(c)参数: c:【array _ like】多项式级数系数的一维数组。返回:【ndarray】系列根的数组。如果所有的根都是真实的，那么出来也是真实的，否则就是复杂的。
代码#1 :
# Python program explaining
# numpy.polyroots() method
# importing numpy as np
# and numpy.polynomial.polynomial module as geek
import numpy as np
import numpy.polynomial.polynomial as geek
# Input polynomial series coefficients
s = (2, 4, 8)
# using np.polyroots() method
res = geek.polyroots(s)
# Resulting polynomial series coefficient
print (res)
Output:
[-0.25-0.4330127j -0.25+0.4330127j]
代码#2 :
# Python program explaining
# numpy.polyroot() method
# importing numpy as np
# and numpy.polynomial.polynomial module as geek
import numpy as np
import numpy.polynomial.polynomial as geek
# polynomial series coefficients
s = (1, 2, 3, 4, 5)
# using np.polyroots() method
res = geek.polyroots(s)
# Resulting polynomial series
print (res)
Output:
[-0.53783227-0.35828469j -0.53783227+0.35828469j 0.13783227-0.67815439j
0.13783227+0.67815439j]
