`numpy:broadcast_arrays`

Signature

def broadcast_arrays(*args, subok = False)

Broadcast any number of arrays against each other.

*args : array_likes: The arrays to broadcast.
subok : bool, optional: If True, then sub-classes will be passed-through, otherwise the returned arrays will be forced to be a base-class array (default).

broadcasted : tuple of arrays: These arrays are views on the original arrays. They are typically not contiguous. Furthermore, more than one element of a broadcasted array may refer to a single memory location. If you need to write to the arrays, make copies first. While you can set the writable flag True, writing to a single output value may end up changing more than one location in the output array.
deprecated 1.17
The output is currently marked so that if written to, a deprecation warning will be emitted. A future version will set the writable flag False so writing to it will raise an error.

import numpy as np
x = np.array([[1,2,3]])
y = np.array([[4],[5]])

✓

np.broadcast_arrays(x, y)

✗

(array([[1, 2, 3],
       [1, 2, 3]]), array([[4, 4, 4],
       [5, 5, 5]]))

Here is a useful idiom for getting contiguous copies instead of non-contiguous views.

[np.array(a) for a in np.broadcast_arrays(x, y)]

✗

[array([[1, 2, 3],
       [1, 2, 3]]), array([[4, 4, 4],
       [5, 5, 5]])]