Python - Remove front column from Matrix

Python - Remove front column from Matrix

In this tutorial, we'll demonstrate how to remove the front (or first) column from a matrix (2D list) in Python.

1. Understanding the Problem

Given a matrix:

matrix = [ [1, 2, 3], [4, 5, 6], [7, 8, 9] ]

We want to remove the front column to get:

result = [ [2, 3], [5, 6], [8, 9] ]

2. Using List Comprehension

You can employ list comprehension to create a new matrix without the front column:

result = [row[1:] for row in matrix] print(result)

3. Using a For Loop

If you prefer an explicit iterative approach:

result = [] for row in matrix: result.append(row[1:]) print(result)

4. Using the map() Function

Another method is to use the map() function with a lambda:

result = list(map(lambda row: row[1:], matrix)) print(result)

5. Conclusion

All of the methods described above will produce the desired output:

[ [2, 3], [5, 6], [8, 9] ]

Your choice between the approaches depends on your coding style and the specific needs of the situation:

  • List Comprehension: Offers a concise and Pythonic solution.

  • For Loop: Provides a clear, step-by-step process, which might be easier for some to follow, especially if additional logic is required during iteration.

  • map() Function: A functional programming approach to obtaining the modified matrix.

Remember to always consider the readability and clarity of your code, especially if others might review or maintain it.

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