[Numpy-discussion] Best way to construct/slice 3-dimensional ndarray from multiple 2d ndarrays?

Keith Hughitt keith.hughitt@gmail....
Wed Aug 17 09:04:10 CDT 2011

Hi all,

I have a method which builds a single 3d ndarray from several
equal-dimension 2d ndarrays, and another method which extracts the original
2d ndarrays back out from the 3d one.

The way I'm doing this right now is pretty simple, e.g.:

cube = np.asarray([arr1, arr2,...])
x = cube[0]

I believe the way this is currently handled, is to use new memory locations
first for the 3d array, and then later for the 2d slices.

Does anyone know if there is a better way to handle this? Ideally, I would
like to reuse the same memory locations instead of copying it anew each

Also, when subclassing ndarray and calling obj = data.view(cls) for an
ndarray "data", does this copy the data into the new object by value or
reference? The method which extracts the 2d slice actually returns a
subclass of ndarray created using the extracted data, so this is why I ask.

Any insight or suggestions would be appreciated.

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