[Solved] What will be the output of this code?import numpy as np arr = np.array([[1, 2], [3, 4]]) result = arr * 2 print(result) | NumPy

NumPy - Broadcasting

What will be the output of this code?

import numpy as np
arr = np.array([[1, 2], [3, 4]])
result = arr * 2
print(result)

A[[1 2] [3 4] [2 4] [6 8]]

B[[2 4] [6 8]]

C[[3 4] [5 6]]

DError: cannot multiply 2D array by scalar

Step-by-Step Solution

Solution:

Step 1: Recognize scalar multiplication with 2D array
Scalar 2 multiplies each element of the 2D array.
Step 2: Calculate element-wise multiplication
[[1*2, 2*2], [3*2, 4*2]] = [[2, 4], [6, 8]]
Final Answer:
[[2 4] [6 8]] -> Option B
Quick Check:
Scalar multiplies each element in 2D array [OK]

Quick Trick: Scalar multiplies all elements in any array shape [OK]

Common Mistakes:

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