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Python | Numpy NP . polyFromroots()方法

原文:https://www . geeksforgeeks . org/python-numpy-NP-polyromroots-method/

**np.polyfromroots()**方法用于生成给定根的多项式级数。

语法: np.polyfromroots(roots) 参数: 根:【array _ like】输入包含根的序列。

返回:【n 数组】多项式级数系数的一维数组。

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) 

Output:

[-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) 

Output:

[-120\.  274\. -225\.   85\.  -15\.    1.]



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