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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.
Updated on: 16-Sep-2021
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