numpy.tril_indices() function | Python

Last Updated : 22 Apr, 2020

numpy.tril_indices() function return the indices for the lower-triangle of an (n, m) array.

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.

Code #1 :

Python3

# Python program explaining
# numpy.tril_indices() function

# importing numpy as geek 
import numpy as geek

gfg = geek.tril_indices(3)

print (gfg)

Output :

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

Code #2 :

Python3

# Python program explaining
# numpy.tril_indices() function

# importing numpy as geek 
import numpy as geek

gfg = geek.tril_indices(3, 2)

print (gfg)

Output :

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

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