Python Numpy np.polyroots()方法

np.polyroots() 方法用于计算多项式数列的根。返回多项式的根。

语法: np.polyroots(c)
参数:
c : [array_like] 多项式数列系数的一维数组。

返回： [ndarray] 数列的根的数组。如果所有的根都是实数，那么输出也是实数，否则就是复数。

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]