Given a 3D array arr with shape (1, 4, 1), you want to add a new axis at the end and then remove all size 1 axes. Which sequence of operations achieves this?

hard📝 Application Q9 of 15

NumPy - Array Manipulation

Given a 3D array arr with shape (1, 4, 1), you want to add a new axis at the end and then remove all size 1 axes. Which sequence of operations achieves this?

Aarr = np.squeeze(arr); arr = np.expand_dims(arr, axis=-1)

Barr = np.expand_dims(arr, axis=-1); arr = np.squeeze(arr)

Carr = np.expand_dims(arr, axis=0); arr = np.squeeze(arr)

Darr = np.squeeze(arr, axis=0); arr = np.expand_dims(arr, axis=1)

Step-by-Step Solution

Solution:

Step 1: Add new axis at the end
np.expand_dims(arr, axis=-1) adds axis at last position, shape becomes (1, 4, 1, 1).
Step 2: Remove all size 1 axes
np.squeeze() removes all axes with size 1, resulting in shape (4,).
Final Answer:
arr = np.expand_dims(arr, axis=-1); arr = np.squeeze(arr) -> Option B
Quick Check:
Expand dims then squeeze removes all size 1 axes [OK]

Quick Trick: Expand dims adds axis; squeeze removes all size 1 axes [OK]

Common Mistakes:

Reversing operation order
Squeezing before adding axis
Using wrong axis values

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 3D array arr with shape (1, 4, 1), you want to add a new axis at the end and then remove all size 1 axes. Which sequence of operations achieves this?

Step 1: Add new axis at the end

Step 2: Remove all size 1 axes

Final Answer:

Quick Check:

Want More Practice?