Python Numpy np.legcompanion()用法及代碼示例

np.legcompanion()方法用於返回Legendre係列的伴隨矩陣。

用法： np.legcompanion(c)

參數：

c :[array_like] 1-D arrays of legendre series coefficients ordered from low to high.

返回：[ndarray]尺寸(度，度)的同伴矩陣。

代碼1：

# Python program explaining 
# numpy.legcompanion() 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 
  
s = (2, 4, 8)  
     
# using np.legcompanion() method  
res = geek.legcompanion(s)  
  
# Resulting Companion matrix 
print (res)

輸出：

[[ 0.          0.28867513]
 [ 0.57735027 -0.33333333]]

代碼2：

# Python program explaining 
# numpy.legcompanion() method  
    
# importing numpy as np   
# and numpy.polynomial.legendre module as geek  
import numpy as np  
import numpy.polynomial.legendre as geek 
    
# legendre series coefficients 
s = (1, 2, 3, 4, 5)  
  
    
# using np.legcompanion() method  
res = geek.legcompanion(s)  
  
# Resulting Companion matrix 
print (res)

輸出：

[[ 0.          0.57735027  0.         -0.30237158]
 [ 0.57735027  0.          0.51639778 -0.34914862]
 [ 0.          0.51639778  0.          0.10141851]
 [ 0.          0.          0.50709255 -0.45714286]]

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