NumPy - Indexing and Slicing
Which slice will select every second element from a NumPy array
arr starting from the first element?Which slice will select every second element from a NumPy array arr starting from the first element?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Understand slice notation for step
Usingarr[::2]means start at index 0, go to the end, and take every 2nd element.Step 2: Compare options
arr[1::2]starts at index 1, not 0.arr[2::2]starts at index 2.arr[:2]only takes first two elements.Final Answer:
arr[::2] -> Option AQuick Check:
Start at 0, step 2 = arr[::2] [OK]
Quick Trick: Use arr[::step] to start from first element with step [OK]
Common Mistakes:
- Starting at wrong index
- Using wrong step value
- Confusing slice end with step
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