[Solved] What is the shape of the array after executing the following code?import numpy as np arr = np.array([1, 2, 3]) new_arr = np.expand_dims(arr, axis=1) | NumPy

NumPy - Array Manipulation

What is the shape of the array after executing the following code?

import numpy as np
arr = np.array([1, 2, 3])
new_arr = np.expand_dims(arr, axis=1)

A(1, 3)

B(3, 1)

C(3,)

D(1,)

Step-by-Step Solution

Solution:

Step 1: Check original array shape
arr is 1D with shape (3,).
Step 2: Apply expand_dims at axis=1
Adding axis at position 1 changes shape to (3, 1).
Final Answer:
(3, 1) -> Option B
Quick Check:
expand_dims axis=1 adds axis after first dim [OK]

Quick Trick: Expand dims inserts axis at given position [OK]

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