Python Numpy np.leg2poly()方法

np.leg2poly()方法用于将 legendre 系列转换为多项式。

语法: np.leg2poly(c)
参数:
c : [array_like] 从低到高排序的 legendre 系列系数的一维数组。

返回： [ndarray] 包含等价多项式系数的一维数组。

代码#1：

# Python program explaining
# numpy.leg2poly() method 
    
# importing numpy as np  
# and numpy.polynomial.legendre module as geek 
import numpy as np 
import numpy.polynomial.legendre as geek
    
# Input legendre series coefficients
  
c = np.array([0.1, 0.2, 0.3, 0.4, 0.5]) 
     
# using np.leg2poly() method 
res = geek.leg2poly(c) 
  
# Resulting equivalent polynomial series coefficient
print (res) 

输出:

[ 0.1375 -0.4    -1.425   1.      2.1875]

代码#2：

# Python program explaining
# numpy.leg2poly() method 
    
# importing numpy as np  
# and numpy.polynomial.legendre module as geek 
import numpy as np 
import numpy.polynomial.legendre as geek
    
# Input legendre series coefficients
  
c = ( 1, 2, 3, 4, 5)
     
# using np.leg2poly() method 
res = geek.leg2poly(c) 
  
# Resulting equivalent polynomial series coefficient
print (res) 

输出:

[  1.375  -4.    -14.25   10.     21.875]