Good ways to “expand” a numpy ndarray?

Question

Are there good ways to \"expand\" a numpy ndarray? Say I have an ndarray like this:

[[1 2]
 [3 4]]

And I want each row to contains more ele

Answer 1

there are also similar methods like np.vstack, np.hstack, np.dstack. I like these over np.concatente as it makes it clear what dimension is being "expanded".

temp = np.array([[1, 2], [3, 4]])
np.hstack((temp, np.zeros((2,3))))

it's easy to remember becase numpy's first axis is vertical so vstack expands the first axis and 2nd axis is horizontal so hstack.