NumPy - Array Manipulation
Which of the following is the correct syntax to add a new axis to a 1D numpy array
a to make it a column vector?Which of the following is the correct syntax to add a new axis to a 1D numpy array a to make it a column vector?
easy📝 Syntax Q12 of 15
Step-by-Step Solution
Solution:
Step 1: Understand array shape and axis addition
To convert a 1D array to a column vector, we add a new axis as the second dimension usinga[:, np.newaxis].Step 2: Check each option
a[np.newaxis, :] adds a new axis at the front, making a row vector (1, 3). a[np.newaxis] does the same, making a row vector (1, 3). a[:, :np.newaxis] runs but does not add a dimension since :np.newaxis is equivalent to :, keeping shape (3,).Final Answer:
a[:, np.newaxis] -> Option AQuick Check:
Column vector = a[:, np.newaxis] [OK]
Quick Trick: Use a[:, np.newaxis] to add a column dimension [OK]
Common Mistakes:
- Using np.newaxis in wrong position
- Confusing row and column vector shapes
- Syntax errors like a[:, :np.newaxis]
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