Python numpy.tril_indices()用法及代碼示例

numpy.tril_indices()函數返回(n，m)數組的lower-triangle的索引。

用法： numpy.tril_indices(n, k = 0, m = None)

參數：

n  :[int] The row dimension of the arrays for which the returned indices will be valid.

k  :[int, optional] Diagonal offset.

m  :[int, optional] The column dimension of the arrays for which the returned arrays will be valid. By default m is taken equal to n.

Return :[tuple of arrays] The indices for the triangle. The returned tuple contains two arrays, each with the indices along one dimension of the array.

代碼1：

# Python program explaining 
# numpy.tril_indices() function 
  
# importing numpy as geek  
import numpy as geek 
  
gfg = geek.tril_indices(3) 
  
print (gfg)

輸出：

(array([0, 1, 1, 2, 2, 2]), array([0, 0, 1, 0, 1, 2]))

代碼2：

# Python program explaining 
# numpy.tril_indices() function 
  
# importing numpy as geek  
import numpy as geek 
  
gfg = geek.tril_indices(3, 2) 
  
print (gfg)

輸出：

(array([0, 0, 0, 1, 1, 1, 2, 2, 2]), array([0, 1, 2, 0, 1, 2, 0, 1, 2]))

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