Given a 2D array arr, you want to flatten it and then multiply each element by 2 without changing the original array. Which code snippet achieves this correctly?

hard📝 Application Q9 of 15

NumPy - Array Manipulation

Given a 2D array arr, you want to flatten it and then multiply each element by 2 without changing the original array. Which code snippet achieves this correctly?

Aflat = arr.flatten() arr[0,0] = arr[0,0] * 2

Bflat = arr.ravel() flat *= 2

Cflat = arr.ravel() flat[0] = flat[0] * 2

Dflat = arr.flatten() flat = flat * 2

Step-by-Step Solution

Solution:

Step 1: Identify copy vs view
flatten() returns a copy, so modifying flat does not affect arr. ravel() may return a view, so changes could affect arr.
Step 2: Check each option
flat = arr.ravel() flat *= 2 modifies flat but if flat is a view, original changes. flat = arr.flatten() flat = flat * 2 safely modifies copy. flat = arr.ravel() flat[0] = flat[0] * 2 modifies only one element, but if view, original changes. flat = arr.flatten() arr[0,0] = arr[0,0] * 2 modifies original array directly.
Final Answer:
Use flatten() to get a copy and multiply safely. -> Option D
Quick Check:
flatten() safe for independent modification [OK]

Quick Trick: Use flatten() to avoid changing original when modifying flattened array [OK]

Common Mistakes:

Using ravel() and unintentionally modifying original
Modifying original array instead of copy
Assuming ravel() always returns copy

Master "Array Manipulation" in NumPy

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions

More NumPy Quizzes

Given a 2D array arr, you want to flatten it and then multiply each element by 2 without changing the original array. Which code snippet achieves this correctly?

Step 1: Identify copy vs view

Step 2: Check each option

Final Answer:

Quick Check:

Want More Practice?