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Python Numpy np.polyfromroots()用法及代码示例


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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注:本文由纯净天空筛选整理自jana_sayantan大神的英文原创作品 Python | Numpy np.polyfromroots() method。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。