Convert Rear Column of a Multi-Sized Matrix in Python

When it is required to convert the rear column of a multi-sized matrix, a simple iteration and the ‘append’ method along with negative indexing is used.

Example

Below is a demonstration of the same −

my_list = [[41, 65, 25], [45, 89], [12, 65, 75, 36, 58], [49, 12, 36, 98],[47, 69, 78]]

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

print("The list after sorting is : " )
my_list.sort()
print(my_list)

my_result = []
for sub_list in my_list:

   my_result.append(sub_list[-1])

print("The resultant list is : ")
print(my_result)

print("The list after sorting is : " )
my_result.sort()
print(my_result)

Output

The list is :
[[41, 65, 25], [45, 89], [12, 65, 75, 36, 58], [49, 12, 36, 98], [47, 69, 78]]
The list after sorting is :
[[12, 65, 75, 36, 58], [41, 65, 25], [45, 89], [47, 69, 78], [49, 12, 36, 98]]
The resultant list is :
[58, 25, 89, 78, 98]
The list after sorting is :
[25, 58, 78, 89, 98]

Explanation

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

• It is sorted using the ‘sort’ method.

• An empty list is created.

• The list is iterated over and the last element (using negative indexing) is accessed.

• This is appended to the empty list.

• This result is displayed as the output on the console.

• This list is again sorted and displayed on the console.