numpy.ma.compress_cols() function in Python Last Updated : 23 Jul, 2025 Comments Improve Suggest changes Like Article Like Report Prerequisite: numpy This numpy inbuilt function suppresses whole columns that contain masked values in a 2-D array. Syntax: numpy.ma.compress_cols(arr) Parameters : arr : [array_like, MaskedArray] This parameter holds the array to operate on.The array must be a 2D array.If no array elements are masked, arr is interpreted as a MaskedArray with mask set to nomask. Return : Returns the compressed array. Below is the Implementation of the above function. Example 1: Python3 # importing numpy as geek import numpy as geek # defining an array with mask arr = geek.ma.array(geek.arange(6).reshape(2, 3), mask=[[1, 0, 0], [0, 0, 0]]) # applying mask to array elements gfg = geek.ma.compress_cols(arr) print(gfg) Output : [[1 2] [4 5]] Example 2: Python3 # importing numpy as geek import numpy as geek # defining array arr = geek.ma.array(geek.arange(9).reshape(3, 3), mask=[ [1, 0, 0], [1, 0, 0], [0, 0, 0]]) # applying mask to array elements gfg = geek.ma.compress_cols(arr) print(gfg) Output : [[1 2] [4 5] [7 8]] Comment More info C code_hunt Follow Improve Article Tags : Python Python-numpy Python numpy-arrayManipulation Explore Python FundamentalsPython Introduction 3 min read Input and Output in Python 4 min read Python Variables 5 min read Python Operators 5 min read Python Keywords 2 min read Python Data Types 7 min read Conditional Statements in Python 3 min read Loops in Python - For, While and Nested Loops 6 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 12 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 6 min read Matplotlib Tutorial 5 min read Python Seaborn Tutorial 15+ min read StatsModel Library- Tutorial 4 min read Learning Model Building in Scikit-learn 8 min read TensorFlow Tutorial 2 min read PyTorch Tutorial 7 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 7 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 3 min read Python Coding Practice 1 min read Python Interview Questions and Answers 15+ min read Like