[
[1,4],
[1,2],
[5,6]
]
If you are trying to create an array of arrays that are dimensionally aligned (in both of the above examples, one dimension is two elements), such as
You can make a clean two-dimensional array, so it can be put into ndarray straightforwardly.
[
[1],
[1,2],
['one']
]
[
[1], // No second element in the first dimension!
[1,2],
['one'] // No second element in the first dimension!
]
It does not become an array with data as neatly as ndarray.
There are cases where it is necessary to use nested arrays with a jug array that allows for a non-uniform number of inner elements, but I think that is deprecated in the sense that it is not appropriate for ndarrays.