Python | Remove duplicates in Matrix

Python | Remove duplicates in Matrix

Last Updated : 24 Mar, 2023

While working with Python Matrix, we can face a problem in which we need to perform the removal of duplicates from Matrix. This problem can occur in Machine Learning domain because of extensive usage of matrices. Let's discuss certain way in which this task can be performed.

Method : Using loop This task can be performed in brute force manner using loops. In this, we just iterate the list of list using loop and check for the already presence of element, and append in case it's new element, and construct a non-duplicate matrix.

Python3

# Python3 code to demonstrate working of
# Removing duplicates in Matrix
# using loop

# initialize list 
test_list = [[5, 6, 8], [8, 5, 3], [9, 10, 3]]

# printing original list
print(&quot;The original list is : &quot; + str(test_list))

# Removing duplicates in Matrix
# using loop
res = []
track = []
count = 0

for sub in test_list:
    res.append([]);
    for ele in sub:
        if ele not in track:
             res[count].append(ele)
             track.append(ele)
    count += 1

# printing result
print(&quot;The Matrix after duplicates removal is : &quot; + str(res))

Output :

The original list is : [[5, 6, 8], [8, 5, 3], [9, 10, 3]]
The Matrix after duplicates removal is : [[5, 6, 8], [3], [9, 10]]

Time Complexity: O(n*n) where n is the number of elements in the list “test_list”.
Auxiliary Space: O(n), where n is the number of elements in the new res list

Python | Remove duplicates in Matrix

manjeet_04

Improve

Article Tags :

Practice Tags :

python

Similar Reads

Python - Remove Kth Index Duplicates in Tuple

Sometimes, while working with Python records, we can have a problem in which we need to remove all the tuples, which have similar Kth index elements in list of records. This kind of problem is common in day-day and web development domain. Let's discuss certain ways in which this task can be performe

Python - Remove Duplicates from a List

Removing duplicates from a list is a common operation in Python which is useful in scenarios where unique elements are required. Python provides multiple methods to achieve this. Using set() method is most efficient for unordered lists. Converting the list to a set removes all duplicates since sets

Python | Remove duplicates from nested list

The task of removing duplicates many times in the recent past, but sometimes when we deal with the complex data structure, in those cases we need different techniques to handle this type of problem. Let's discuss certain ways in which this task can be achieved. Method #1 : Using sorted() + set()Â Th

Python | Removing duplicates from tuple

Many times, while working with Python tuples, we can have a problem removing duplicates. This is a very common problem and can occur in any form of programming setup, be it regular programming or web development. Let's discuss certain ways in which this task can be performed. Method #1 : Using set()

Removing Duplicates of a List of Sets in Python

Dealing with sets in Python allows for efficient handling of unique elements, but when working with a list of sets, you may encounter scenarios where duplicates need to be removed. In this article, we will see how we can remove duplicates of a list of sets in Python. Remove Duplicates of a List of S

Remove Duplicate Strings from a List in Python

Removing duplicates helps in reducing redundancy and improving data consistency. In this article, we will explore various ways to do this. set() method converts the list into a set, which automatically removes duplicates because sets do not allow duplicate values.Pythona = ["Learn", "Python", "With"

Python | Remove False row from matrix

Sometimes, while handling data, especially in the Machine Learning domain, we need to go through a lot of incomplete or empty data. We sometimes need to eliminate the rows which do not contain a value in any of the columns. Let's discuss certain ways to remove the rows that have all False values as

Python program to remove rows with duplicate element in Matrix

Given Matrix, remove all rows which have duplicate elements in them. Input : test_list = [[4, 3, 2], [7, 6, 7], [2, 4, 4], [8, 9, 9]] Output : [[4, 3, 2]] Explanation : [4, 3, 2] is the only unique row. Input : test_list = [[4, 3, 3, 2], [7, 6, 7], [2, 4, 4], [8, 9, 9]] Output : [] Explanation : No

Python - Remove Columns of Duplicate Elements

Given a Matrix, write a Python program to remove whole column if duplicate occurs in any row. Examples: Input : test_list = [[4, 3, 5, 2, 3], [6, 4, 2, 1, 1], [4, 3, 9, 3, 9], [5, 4, 3, 2, 1]] Output : [[4, 3, 5], [6, 4, 2], [4, 3, 9], [5, 4, 3]] Explanation : 1 has duplicate as next element hence 5

Remove all Duplicates and Permutations in Nested List - Python

Given a nested list the task is to remove all duplicates and permutations in that nested list. For example: we have the nested list : [[ -11, 0, 11], [ -11, 11, 0], [ -11, 0, 11], [-11, 2, -11], [-11, 2, -11], [-11, -11, 2]] then output will be {(-11, 0, 11), (-11, -11, 2)}Using MapWe first sort eac