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Python Numpy np.polyfromroots()用法及代碼示例


np.polyfromroots()方法用於生成具有給定根的多項式級數。

用法: np.polyfromroots(roots)
參數:
roots :[array_like] Input sequence containing the roots.

返回:[ndarray]多項式級數的一維數組。


代碼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) 
輸出:
[-64.  56. -14.   1.]

代碼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) 
輸出:
[-120.  274. -225.   85.  -15.    1.]




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注:本文由純淨天空篩選整理自jana_sayantan大神的英文原創作品 Python | Numpy np.polyfromroots() method。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。