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Python – Sort Matrix by Number of elements greater than its previous element
When it is required to sort a matrix based on the number of elements that is greater than the previous element, a list comprehension and the ‘len’ method is used by using a function.
Below is a demonstration of the same −
Example
def fetch_greater_freq(row):
return len([row[idx] for idx in range(0, len(row) - 1) if row[idx] < row[idx + 1]])
my_list = [[11, 3, 25, 99, 10], [5, 3, 25, 4], [77, 11, 5, 3, 77, 77], [11, 3, 25]]
print("The list is :")
print(my_list)
my_list.sort(key=fetch_greater_freq)
print("The resultant list is :")
print(my_list)Output
The list is : [[11, 3, 25, 99, 10], [5, 3, 25, 4], [77, 11, 5, 3, 77, 77], [11, 3, 25]] The resultant list is : [[5, 3, 25, 4], [77, 11, 5, 3, 77, 77], [11, 3, 25], [11, 3, 25, 99, 10]]
Explanation
A method named ‘fetch_greater_freq’ is defined that takes a list as a parameter.
The list is iterated over, and a specific element is accessed and checked to see if it is less than its consecutive element.
Its length is returned as output of the method.
Outside the method, a list of list of integers is defined and is displayed on the console.
The list is sorted using the sort method by passing the previously defined method as the parameter.
The output is displayed on the console.
Updated on: 04-Sep-2021
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