numpy.tril() in Python (original) (raw)

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.

import numpy as geek

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
.

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