Python Program to Extract Rows of a matrix with Even frequency Elements

When it is required to extract rows of a matrix with even frequency elements, a list comprehension with ‘all’ operator and ‘Counter’ method are used.

Example

Below is a demonstration of the same

from collections import Counter

my_list = [[41, 25, 25, 62], [41, 41, 41, 41, 22, 22], [65, 57, 65, 57], [11, 24, 36, 48]]

print("The list is :")
print(my_list)

my_result = [sub for sub in my_list if all( value % 2 == 0 for key, value in
list(dict(Counter(sub)).items()))]

print("The result is :")
print(my_result)

Output

The list is :
[[41, 25, 25, 62], [41, 41, 41, 41, 22, 22], [65, 57, 65, 57], [11, 24, 36, 48]]
The result is :
[[41, 41, 41, 41, 22, 22], [65, 57, 65, 57]]

Explanation

• A list of list is defined and is displayed on the console.

• A list comprehension is used to iterate over the elements in the list, and the ‘all’ operator is used, to check if the value is divisibe by 2.

• The elements of the list are accessed using ‘Counter’ and ‘dict’.

• This is converted to a list and is assigned to a variable.

• This is displayed as output on the console.

AmitDiwan

Updated on 16-Sep-2021 08:15:08

• Related Questions & Answers
• Python program to extract rows with common difference elements
• Python – Extract rows with Even length strings
• Python – Extract elements with equal frequency as value
• Python program to extract rows from Matrix that has distinct data types
• Python Program to Sort Matrix Rows by summation of consecutive difference of elements
• Find distinct elements common to all rows of a matrix in Python
• Python – Extract String elements from Mixed Matrix
• Python program to remove rows with duplicate element in Matrix
• Python program to extract Mono-digit elements
• Python – Check Similar elements in Matrix rows
• Java Program to Interchange Elements of First and Last in a Matrix Across Rows
• Python program to sort matrix based upon sum of rows
• Python Program to sort rows of a matrix by custom element count
• Python program to print Rows where all its Elements’ frequency is greater than K
• Python Program to Extract Elements from a List in a Set