You want to create a 4x4 NumPy array filled with the value 9, but only the diagonal elements should be 0. Which code correctly achieves this using np.full() and other NumPy functions?

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NumPy - Creating Arrays

You want to create a 4x4 NumPy array filled with the value 9, but only the diagonal elements should be 0. Which code correctly achieves this using np.full() and other NumPy functions?

Aarr = np.zeros((4,4)); arr[:] = 9; print(arr)

Barr = np.full((4,4), 9); np.fill_diagonal(arr, 0); print(arr)

Carr = np.full((4,4), 0); np.fill_diagonal(arr, 9); print(arr)

Darr = np.full(4, 9); np.fill_diagonal(arr, 0); print(arr)

Step-by-Step Solution

Solution:

Step 1: Create a 4x4 array filled with 9
Using np.full((4,4), 9) creates a 4x4 array where every element is 9.
Step 2: Replace diagonal elements with 0
np.fill_diagonal(arr, 0) sets the diagonal elements of the array to 0.
Step 3: Verify the output
Printing arr shows a 4x4 array with 9 everywhere except 0 on the diagonal.
Final Answer:
arr = np.full((4,4), 9); np.fill_diagonal(arr, 0); print(arr) -> Option B
Quick Check:
Fill then fill_diagonal for custom values [OK]

Quick Trick: Fill full array first, then change diagonal [OK]

Common Mistakes:

Filling zeros first then trying to fill diagonal with 9
Using wrong shape or 1D array for 2D problem
Misusing np.fill_diagonal on 1D arrays

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More NumPy Quizzes

You want to create a 4x4 NumPy array filled with the value 9, but only the diagonal elements should be 0. Which code correctly achieves this using np.full() and other NumPy functions?

Step 1: Create a 4x4 array filled with 9

Step 2: Replace diagonal elements with 0

Step 3: Verify the output

Final Answer:

Quick Check:

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