NumPy - Indexing and Slicing
What will be the output of
arr[::-3] for arr = np.array([2, 4, 6, 8, 10, 12, 14])?What will be the output of arr[::-3] for arr = np.array([2, 4, 6, 8, 10, 12, 14])?
medium📝 Predict Output Q5 of 15
Step-by-Step Solution
Solution:
Step 1: Understand negative step
A negative step reverses the array and picks elements every 3 steps.Step 2: Select elements
Starting from last element (14), then index 3 (8), then index 0 (2).Final Answer:
[14 8 2] -> Option BQuick Check:
Negative step reverses and skips elements [OK]
Quick Trick: Negative step slices backward skipping elements [OK]
Common Mistakes:
- Ignoring negative step effect
- Wrong start index
- Miscounting step intervals
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