Array Reshaping

Problem Statement

Reshape arrays into different dimensions.

Background

NumPy reshape operations:

• arr.reshape(m, n) - reshape to m×n
• arr.reshape(-1) - flatten
• arr.reshape(-1, 1) - column vector
• arr.T or arr.transpose() - transpose

Your Task

Write a function reshape_array(arr, rows, cols) that reshapes a 1D array.

Output Format

Return a dictionary with:

• "reshaped": Array reshaped to (rows, cols) as list
• "transposed": Transposed (cols, rows) as list
• "flattened": Flattened back to 1D as list
• "column_vec": As column vector (n, 1) as list