numpy.tril_indices()函数| Python

numpy.tril_indices()函数返回 (n, m) 数组的下三角形的索引。

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

代码#1：

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

输出 ：

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

代码#2：

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

输出 ：

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