numpy.diag() in Python Last Updated : 09 Mar, 2022 Comments Improve Suggest changes 5 Likes Like Report numpy.diag(a, k=0) : Extracts and construct a diagonal array Parameters : a : array_like k : [int, optional, 0 by default] Diagonal we require; k>0 means diagonal above main diagonal or vice versa. Returns : ndarray Python # Python Programming illustrating # numpy.diag method import numpy as geek # matrix creation by array input a = geek.matrix([[1, 21, 30], [63 ,434, 3], [54, 54, 56]]) print("Main Diagonal elements : \n", geek.diag(a), "\n") print("Diagonal above main diagonal : \n", geek.diag(a, 1), "\n") print("Diagonal below main diagonal : \n", geek.diag(a, -1)) Output : Main Diagonal elements : [ 1 434 56] Diagonal above main diagonal : [21 3] Diagonal below main diagonal : [63 54] References : https://numpy.org/doc/stable/reference/generated/numpy.diagflat.html#numpy.diagflat Note : These NumPy-Python programs won't run on online IDE's, so run them on your systems to explore them . Comment M Mohit Gupta 5 Improve M Mohit Gupta 5 Improve Article Tags : Python Python-numpy Python numpy-arrayCreation Explore Python FundamentalsPython Introduction 2 min read Input and Output in Python 4 min read Python Variables 5 min read Python Operators 4 min read Python Keywords 2 min read Python Data Types 8 min read Conditional Statements in Python 3 min read Loops in Python - For, While and Nested Loops 5 min read Python Functions 5 min read Recursion in Python 4 min read Python Lambda Functions 5 min read Python Data StructuresPython String 5 min read Python Lists 4 min read Python Tuples 4 min read Python Dictionary 3 min read Python Sets 6 min read Python Arrays 7 min read List Comprehension in Python 4 min read Advanced PythonPython OOP Concepts 11 min read Python Exception Handling 5 min read File Handling in Python 4 min read Python Database Tutorial 4 min read Python MongoDB Tutorial 2 min read Python MySQL 9 min read Python Packages 10 min read Python Modules 7 min read Python DSA Libraries 15 min read List of Python GUI Library and Packages 3 min read Data Science with PythonNumPy Tutorial - Python Library 3 min read Pandas Tutorial 4 min read Matplotlib Tutorial 5 min read Python Seaborn Tutorial 15+ min read StatsModel Library - Tutorial 3 min read Learning Model Building in Scikit-learn 8 min read TensorFlow Tutorial 2 min read PyTorch Tutorial 6 min read Web Development with PythonFlask Tutorial 8 min read Django Tutorial | Learn Django Framework 7 min read Django ORM - Inserting, Updating & Deleting Data 4 min read Templating With Jinja2 in Flask 6 min read Django Templates 5 min read Python | Build a REST API using Flask 3 min read How to Create a basic API using Django Rest Framework ? 4 min read Python PracticePython Quiz 1 min read Python Coding Practice 1 min read Python Interview Questions and Answers 15+ min read Like