np.polyfromroots()
方法用于生成具有给定根的多项式级数。
用法:np.polyfromroots(roots)
参数:
roots :[array_like] Input sequence containing the roots.
返回:[ndarray]多项式级数的一维数组。
代码1:
# Python program explaining
# numpy.polyfromroots() method
# importing numpy as np
# and numpy.polynomial.polynomial module as geek
import numpy as np
import numpy.polynomial.polynomial as geek
# Input roots
roots = (2, 4, 8)
# using np.polyfromroots() method
res = geek.polyfromroots(roots)
# Resulting polynomial series coefficient
print (res)
输出:
[-64. 56. -14. 1.]
代码2:
# Python program explaining
# numpy.polyfromroots() method
# importing numpy as np
# and numpy.polynomial.polynomial module as geek
import numpy as np
import numpy.polynomial.polynomial as geek
# Input roots
s = (1, 2, 3, 4, 5)
# using np.polyfromroots() method
res = geek.polyfromroots(s)
# Resulting polynomial series coefficient
print (res)
输出:
[-120. 274. -225. 85. -15. 1.]
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