Python| Numpy np.polyroots() 方法

np.polyroots()方法用于计算多项式系列的根。返回多项式的根。

Syntax : np.polyroots(c)
Parameters:
c :[array_like] 1-D arrays of polynomial series coefficients.

Return : [ndarray] Array of the roots of the series. If all the roots are real, then out is also real, otherwise it is complex.

代码#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) 

输出：

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

代码#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) 

输出：

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