This article would be more convincing if the NumPy version were actually vectorized. Replace the for-loop with result = (arr - min_val) / (max_val - min_va

This article would be more convincing if the NumPy version were actually vectorized. Replace the for-loop with result = (arr - min_val) / (max_val - min_val) That should often run faster and removes the allocation and for-loop, so it's easier to read.