numpy.argwhere() in Python Last Updated : 24 Dec, 2018 Comments Improve Suggest changes 1 Likes Like Report numpy.argwhere() function is used to find the indices of array elements that are non-zero, grouped by element. Syntax : numpy.argwhere(arr) Parameters : arr : [array_like] Input array. Return : [ndarray] Indices of elements that are non-zero. Indices are grouped by element. Code #1 : Python3 # Python program explaining # argwhere() function import numpy as geek # input array in_arr = [[ 2, 0, 7], [ 0, 5, 9]] print ("Input array : ", in_arr) out_arr = geek.argwhere(in_arr) print ("Output indices of non zero array element: \n", out_arr) Output: Input array : [[2, 0, 7], [0, 5, 9]] Output indices of non zero array element: [[0 0] [0 2] [1 1] [1 2]] Code #2 : Python3 # Python program explaining # argwhere() function import numpy as geek # input array in_arr = geek.arange(8).reshape(4, 2) print ("Input array : ", in_arr) out_arr = geek.argwhere(in_arr>4) print ("Output indices greater than 4: \n", out_arr) Output: Input array : [[0 1] [2 3] [4 5] [6 7]] Output indices greater than 4: [[2 1] [3 0] [3 1]] Create Quiz Comment J jana_sayantan Follow 1 Improve J jana_sayantan Follow 1 Improve Article Tags : Python Python-numpy Python numpy-Sorting Searching Explore Python FundamentalsPython Introduction 2 min read Input and Output in Python 4 min read Python Variables 4 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 3 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 3 min read StatsModel Library - Tutorial 3 min read Learning Model Building in Scikit-learn 6 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 Build a REST API using Flask - Python 3 min read Building a Simple API with Django REST Framework 3 min read Python PracticePython Quiz 1 min read Python Coding Practice 1 min read Python Interview Questions and Answers 15+ min read Like