NumPy - Broadcasting
What is the shape of the result when adding arrays
a = np.ones((3,1)) and b = np.ones((1,4)) using broadcasting?What is the shape of the result when adding arrays a = np.ones((3,1)) and b = np.ones((1,4)) using broadcasting?
medium📝 Predict Output Q13 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze shapes of a and b
a has shape (3,1), b has shape (1,4). Broadcasting compares from right: 1 vs 4 and 3 vs 1.Step 2: Apply broadcasting rules
Dimensions 1 and 4 broadcast to 4; 3 and 1 broadcast to 3. Result shape is (3,4).Final Answer:
(3, 4) -> Option DQuick Check:
Broadcast (3,1) + (1,4) = (3,4) [OK]
Quick Trick: Match dims right to left, stretch 1 to other size [OK]
Common Mistakes:
- Confusing order of dimensions
- Forgetting to broadcast size 1 dimension
- Swapping dimensions in result shape
Master "Broadcasting" in NumPy
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