[Numpy-discussion] idiom for deleting array elements
Stefan van der Walt
stefan at sun.ac.za
Tue Nov 28 11:31:32 EST 2006
On Tue, Nov 28, 2006 at 04:59:22PM +0100, Martin Wiechert wrote:
> I'm looking for an idiom to delete a sparse subset S (given as integer indices
> into A) of elements from a 1d array A.
>
> Something like
>
> del L [I]
>
> if L is a list and I is a non-fancy index.
>
> My best idea is
>
> B = ones (A.shape, bool)
> B [S] = False
> A = A [B]
>
> Is there a better idiom (briefer, not requiring temporary boolean
> array)?
x = N.array([1,2,3,4,5])
N.delete(x,[2,4])
Cheers
Stéfan
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