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Python – Cumulative Row Frequencies in a List
When it is required to get the cumulative row frequencies in a list, the ‘Counter’ method, and a list comprehension are used.
Example
Below is a demonstration of the same
from collections import Counter
my_list = [[11, 2, 32, 4, 31], [52, 52, 3, 71, 71, 3], [1, 3], [19, 19, 40, 40, 40]]
print("The list is :")
print(my_list)
my_element_list = [19, 2, 71]
my_frequency = [Counter(element) for element in my_list]
my_result = [sum([freq[word] for word in my_element_list if word in freq]) for freq in my_frequency]
print("The resultant matrix is :")
print(my_result)Output
The list is : [[11, 2, 32, 4, 31], [52, 52, 3, 71, 71, 3], [1, 3], [19, 19, 40, 40, 40]] The resultant matrix is : [1, 2, 0, 2]
Explanation
The required packages are imported into the environment.
A list is defined and is displayed on the console.
Another list of integers is defined.
The list comprehension along with the ‘Counter’ method is used to iterate through the list.
This is assigned to a variable.
List comprehension is used to iterate through the list again and add the elements if the element is present in the list.
This is assigned to a variable.
This is displayed as output on the console.
Updated on: 14-Sep-2021
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