Repeating the content of a numpy array arbitrarily

Question

I am dealing with numpy arrays of shape (nb, 128, 128, 3) where nb is a variable quantity. I am looking for a way to concatenate them.

An example input: Two numpy arrays with shapes (1088, 128, 128, 3) and (823, 128, 128, 3).

Now, the shape of the output array after the desired operation should be (1911, 128, 128, 3).

Note: The number of numpy arrays to be concatenated could be variable.

Thank you for your time in advance.

S. P · Accepted Answer · 2020-01-13 17:37:38Z

1

If you have variable no. of arrays in a list, there also np.concatenate does the trick.

listOfArrays = [a, b, c,.... ,n]
np.concatenate(listOfArrays, axis=0)

S. P

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answered Jan 11, 2020 at 17:55

Desmond

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Comments

BramAppel · Accepted Answer · 2020-01-11 16:15:26Z

1

Consider the following:

import numpy as np

# your arrays
A = np.array(...)
B = np.array(...)

C = np.concatenate((A, B))

answered Jan 11, 2020 at 16:09

BramAppel

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Thanks for your inputs. But what if instead of having two numpy arrays I have n?

@WarrenWeckesser, agree.

@S.P The tuple argument of concatenate can be of length n.