how to make each element in an array another array

Question

Hi I came across a problem. I have a numpy array with size (256, 144). Each element is 0 in this array. Now I want to make each element in the array to be [0, 0, 0]. Is there a way of doing this?

The code is:

empty_windows = np.zeros(256, 144)
for i in range(256*144):
    empty_windows[i] = [0,0,0]

This method doesnt work as it returns an error message "ValueError: setting an array element with a sequence."

Is there a way of doing this? Thank you very much.

Asked By: Maria Sabrina Ma

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Source

Answer 1

If you don’t need to do anything with empty_windows while it has size (256, 144), you can simply create it with the proper size:

empty_windows = np.zeros((256, 144, 3))

Answered By: Aemyl

Answer 2

You could try creating a second numpy array with the required shape, which in your case is (256,144,3) , iterating over it and correcting the elements as required.

empty_windows = np.zeros((256, 144))

x = np.random.rand(256,144,3)

for i in range(256):
  for j in range(144):
    x[i][j] = [empty_windows[i][j] for _ in range(3)]

empty_windows = x

You may also want to brush up on your understanding of numpy arrays, as the commenter mentioned, particularly how to initialize and iterate over them.

Answered By: mino.g

how to make each element in an array another array

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