You have a numpy array arr = np.array([0, 1, 2, 3, 4, 5]). How can you use boolean indexing to select only the even numbers?

hard📝 Application Q9 of 15

NumPy - Indexing and Slicing

You have a numpy array arr = np.array([0, 1, 2, 3, 4, 5]). How can you use boolean indexing to select only the even numbers?

Aarr[arr % 2 != 0]

Barr[arr % 2 == 0]

Carr[arr // 2 == 0]

Darr[arr % 2 = 0]

Step-by-Step Solution

Solution:

Step 1: Identify condition for even numbers
Even numbers have zero remainder when divided by 2: arr % 2 == 0.
Step 2: Use boolean indexing with this condition
arr[arr % 2 == 0] selects even numbers: 0, 2, 4.
Final Answer:
arr[arr % 2 == 0] -> Option B
Quick Check:
Modulo 2 equals zero filters even numbers [OK]

Quick Trick: Use modulo 2 == 0 to filter even numbers [OK]

Common Mistakes:

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