Numpy array creation without broadcasting

Question

I have an array:

one = np.array([[1], [0]])

How arr can be created such that, every element of arr would be equal to one?

If I do:

arr = one * 4

Due to broadcasting above statement doesn't give the desired behavior.

What's the shape of arr supposed to be? With lists * 4 is a replication, but with arrays it is plain numeric multiplication. — hpaulj
– hpaulj, Commented Mar 3, 2019 at 22:17
@hpaulj I accepted the answer, it does exactly what I wanted — Kenenbek Arzymatov
– Kenenbek Arzymatov, Commented Mar 3, 2019 at 22:20

iz_ · Accepted Answer · 2019-03-03 22:06:40Z

2

Use repeat:

np.repeat(one[np.newaxis, ...], 4, axis=0)

Alternatively, you can try broadcast_to. This will be faster but read-only:

np.broadcast_to(one, (4, *one.shape))

answered Mar 3, 2019 at 22:06

iz_

16.7k4 gold badges29 silver badges43 bronze badges

Sign up to request clarification or add additional context in comments.

1 Answer 1