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2D Array Slicing

EasyNumPy Slicing

Problem Statement

Extract portions of a 2D NumPy array using slicing.

Background

For 2D arrays:

  • arr[i, j] - element at row i, column j
  • arr[i, :] or arr[i] - entire row i
  • arr[:, j] - entire column j
  • arr[r1:r2, c1:c2] - submatrix

Your Task

Write a function slice_2d(arr) that returns a dictionary with:

  • "top_left": Top-left 2×2 submatrix (as list)
  • "bottom_row": Last row (as list)
  • "right_col": Rightmost column (as list)
  • "center": Center element (as int, for odd dimensions)

Example:

Input:
3×3 array [[1,2,3],[4,5,6],[7,8,9]]
Output:
{'top_left': [[1, 2], [4, 5]], 'bottom_row': [7, 8, 9], 'right_col': [3, 6, 9], 'center': 5}
Reasoning:

[:2,:2] for top-left, [-1,:] for bottom, [:,-1] for right, center at (1,1)

Constraints:

  • Array will be at least 3×3
  • For center, use shape//2 for both dimensions
Editor

Test Results

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