numpy.tril() in Python

Last Updated : 09 Mar, 2022

numpy.tril(a, k=0) : Returns copy of array with lower part of the triangle w.r.t k Parameters :

 a : input array k : [int, optional, 0 by default] Diagonal we require; k>0 means diagonal above main diagonal or vice versa.

Returns :

 Lower triangle of a, having same shape and data-type as a.

Python

# Python Programming illustrating # numpy.tril method import numpy as geek # string input a = geek.matrix([[1, 21, 30], [63 ,434, 3], [54, 54, 56]]) print("Main Diagonal elements : \n", geek.tril(a), "\n") print("Diagonal above main Diagonal elements : \n", geek.tril(a, 1), "\n\n") print("Main Diagonal elements : \n", geek.tril(a, -1))

Output :

 Main Diagonal elements : [[ 1 0 0] [ 63 434 0] [ 54 54 56]] Diagonal above main Diagonal elements : [[ 1 21 0] [ 63 434 3] [ 54 54 56]] Main Diagonal elements : [[ 0 0 0] [63 0 0] [54 54 0]]

References: https://docs.scipy.org/doc/numpy/reference/generated/numpy.tril.html#numpy.tril Note : These NumPy-Python programs won't run on online IDE's, so run them on your systems to explore them .

numpy.triu() in Python

M

Mohit Gupta

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