You have a 2D numpy array data of shape (4, 5). How would you extract the element in the last row and last column using indexing?

hard📝 Application Q8 of 15

NumPy - Indexing and Slicing

You have a 2D numpy array data of shape (4, 5). How would you extract the element in the last row and last column using indexing?

Adata[3, 4]

BBoth A and B

Cdata[4, 5]

Ddata[-1, -1]

Step-by-Step Solution

Solution:

Step 1: Understand array shape and indexing
Shape (4,5) means rows 0-3 and columns 0-4.
Step 2: Identify valid indices for last row and column
Last row is index 3 or -1, last column is index 4 or -1.
Step 3: Check options
data[3, 4] uses positive indices, data[-1, -1] uses negative indices, both valid. data[4, 5] is out of range.
Final Answer:
Both A and B -> Option B
Quick Check:
Negative indices count from end, positive from start [OK]

Quick Trick: Use negative indices to access elements from the end [OK]

Common Mistakes:

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