[Numpy-discussion] Slicing/selection in multiple dimensions simultaneously

David Warde-Farley dwf@cs.toronto....
Mon Mar 2 13:10:36 CST 2009


On 2-Mar-09, at 12:25 PM, Robert Kern wrote:

> a[[2,3,6], ...][..., [3,2]]
>
> You're doing fancy indexing, so there are copies both times.

D'oh!

So I guess the only way to avoid the second copy is to do what Jon  
initially suggested, i.e. a[ix_([2,3,6],range(a.shape[1]),[3,2])] ?

I suppose xrange would be better than arange() or range() as it  
wouldn't create and destroy the list all at once.

D


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