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Which of the following is the correct syntax for np.where() with three arguments?

easy📝 Syntax Q3 of 15
NumPy - Indexing and Slicing
Which of the following is the correct syntax for np.where() with three arguments?
Anp.where(condition)
Bnp.where(x, y, condition)
Cnp.where(condition, x, y)
Dnp.where(x, condition, y)
Step-by-Step Solution
Solution:

  1. Step 1: Recall np.where syntax

    The correct syntax is np.where(condition, x, y) where elements are chosen from x or y based on condition.

  2. Step 2: Verify argument order

    Condition must be first, then value if True, then value if False.

  3. Final Answer:

    np.where(condition, x, y) -> Option C

  4. Quick Check:

    np.where(condition, x, y) is correct syntax [OK]
Quick Trick: Condition first, then true value, then false value [OK]
Common Mistakes:
  • Mixing argument order
  • Using only two arguments incorrectly
  • Confusing with boolean masks

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