i'm working with python/numpy and search in the docs but cant find the method to accomplish this

i have this two arrays and want to concatenate the elements inside the array into a second array

this is my first array

```
import numpy as np
a = np.array([0, 0, 0, 0, 0, 0, 0, 0],[0, 0, 0, 0, 0, 0, 0, 0])

```

my goal is

Output:

`[[00000000], [00000000]]`

the reason of this is for later transform every element of the array into hex