[Numpy-discussion] three-dim array

[Benjamin Root]

Ewww, kinda wish that would be an error... It would be too easy for a typo
to get accepted this way.

On Wed, Dec 26, 2018 at 1:59 AM Eric Wieser <wieser.eric+numpy at gmail.com>
wrote:

> In the latest version of numpy, this runs without an error, although may
> or may not be what you want:
>
> In [1]: np.array([[1,2],[[1,2],[3,4]]])
> Out[1]:
> array([[1, 2],
>        [list([1, 2]), list([3, 4])]], dtype=object)
>
> Here the result is a 2x2 array, where some elements are numbers and others
> are lists.
> ​
>
> On Wed, 26 Dec 2018 at 06:23 Mark Alexander Mikofski <
> mikofski at berkeley.edu> wrote:
>
>> I believe numpy arrays must be rectangular, yours is jagged, instead try
>>
>> >>> x3d = np.array([[[1, 2], [1, 2], [3, 4]]])
>> >>> x3d.shape
>> (1, 3, 2)
>>
>> Note: 3 opening brackets, yours has 2
>> And single brackets around the 3 innermost arrays, yours has single
>> brackets for the 1st, and double brackets around the 2nd and 3rd
>>
>>
>> On Tue, Dec 25, 2018, 6:20 PM Jeff <jeffp at vodafonemail.de wrote:
>>
>>> hello,
>>>
>>> sorry newbe to numpy.
>>>
>>> I want to define a three-dim array.
>>> I know this works:
>>>
>>>  >>> np.array([[[1,2],[3,4]],[[5,6],[7,8]]])
>>> array([[[1, 2],
>>>          [3, 4]],
>>>
>>>         [[5, 6],
>>>          [7, 8]]])
>>>
>>> But can you tell why this doesnt work?
>>>
>>>  >>> np.array([[1,2],[[1,2],[3,4]]])
>>> Traceback (most recent call last):
>>>    File "<stdin>", line 1, in <module>
>>> ValueError: setting an array element with a sequence.
>>>
>>>
>>> Thank you.
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