[Numpy-discussion] ndrange, like range but multidimensiontal
allanhaldane at gmail.com
Sun Oct 7 17:20:11 EDT 2018
On 10/07/2018 10:32 AM, Mark Harfouche wrote:
> With `np.ndrange` it can look something like this:
> c = np.empty((4, 4), dtype=object)
> # ... compute on c
> for i in np.ndrange(c.shape)[:, 1:-1]:
> c[i] # = some operation on c[i] that depends on the index i
> very pythonic, very familiar to numpy users
So if I understand, this does the same as `np.ndindex` but allows
numpy-like slicing of the returned generator object, as requested in #6393.
I don't like the duplication in functionality between ndindex and
ndrange here. Better rather to add the slicing functionality to ndindex,
than create a whole new nearly-identical function. np.ndindex is
already a somewhat obscure and discouraged method since it is usually
better to find a vectorized numpy operation instead of a for loop, and I
don't like adding more obscure functions.
But as an improvement to np.ndindex, I think adding this functionality
seems good if it can be nicely implemented. Maybe there is a way to use
the same optimization tricks as in the current implementation of ndindex
but allow different stop/step? A simple wrapper of ndindex?
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