Guided Notes
Copy vs View & Iterating
When arrays share memory, the base attribute, and looping with nditer and ndenumerate.
Copies and views
Slide 1 / 5Some operations create a copy β a new array with its own data. Others create a view β a new array object that looks at the same data as the original.
β’ A copy owns its data: changing it never affects the original. β’ A view doesn't own its data: changing the view changes the original, and vice versa.
Views make NumPy fast and memory-efficient, because slicing a huge array doesn't duplicate it. But they can surprise you.