[Solved] In NumPy slicing arr[start:stop:step], what effect does a negative step value have? — Ans: It reverses the direction of slicing, selecting elements backward. | NumPy

NumPy - Indexing and Slicing

In NumPy slicing arr[start:stop:step], what effect does a negative step value have?

AIt skips elements forward by the absolute value of <code>step</code>.

BIt reverses the direction of slicing, selecting elements backward.

CIt causes an error because <code>step</code> cannot be negative.

DIt selects elements only at even indices.

Step-by-Step Solution

Solution:

Step 1: Understand step parameter
The step controls the stride between elements in the slice.
Step 2: Negative step meaning
A negative step means slicing proceeds from higher to lower indices, effectively reversing the array slice.
Final Answer:
It reverses the direction of slicing, selecting elements backward. -> Option B
Quick Check:
Negative step reverses slice direction [OK]

Quick Trick: Negative step reverses slice direction [OK]

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In NumPy slicing arr[start:stop:step], what effect does a negative step value have?