How to Use Unknown Dimensions When Reshaping in NumPy

In this example we will show how to use unknown dimensions when reshaping in Python NumPy.

Source Code

import numpy as np

n = np.array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12])

reshape_n = n.reshape(2, -1, 3)

print(reshape_n)

Output:

[[[ 1  2  3]
  [ 4  5  6]]

 [[ 7  8  9]
  [10 11 12]]]