Python Numpy np.polyroots()用法及代碼示例

np.polyroots()方法用於計算多項式級數的根。返回多項式的根。

用法： np.polyroots(c)

參數：

c :[array_like] 1-D arrays of polynomial series coefficients.

返回：[ndarray]係列根的數組。如果所有的根都是真實的，那麽輸出也是真實的，否則它是複雜的。

代碼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)

輸出：

[-0.25-0.4330127j -0.25+0.4330127j]

代碼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)

輸出：

[-0.53783227-0.35828469j -0.53783227+0.35828469j  0.13783227-0.67815439j
  0.13783227+0.67815439j]

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