Add an Array to numpy sub array

Question

i have an array [[[1],[2]]] and i want to add [3] to get [[[1],[2],[3]]]

what i've tried so far

my_array = numpy.array([[[1],[2]]])
print(my_array.shape, my_array)

to_append = numpy.array([3])
print(to_append.shape, to_append)

# i want [[[1],[2],[3]]]
my_array[0] = numpy.append(my_array[0], to_append)

but i get

ValueError: could not broadcast input array from shape (3) into shape (2,1)

Pablo C · Accepted Answer · 2021-02-07 20:12:19Z

3

you can use numpy.concatenate:

>>> np.concatenate([my_array, [[[3]]]], 1)
array([[[1],
        [2],
        [3]]])

answered Feb 7, 2021 at 20:12

Pablo C

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Simon · Accepted Answer · 2021-02-07 20:07:03Z

1

Maybe numpy.concatenate could work here but you have to make sure the arrays are the same in one dimension

answered Feb 7, 2021 at 20:07

Simon

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Comments

Stef · Accepted Answer · 2021-02-07 20:17:23Z

1

numpy.append(my_array, to_append[None,:,None], 1)

Result

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

answered Feb 7, 2021 at 20:17

Stef

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