[Numpy-discussion] On responding to dubious ideas (was: Re: Advanced indexing: "fancy" vs. orthogonal)

[Alexander Belopolsky]

On Thu, Apr 9, 2015 at 8:41 PM, Derek Homeier <
derek at astro.physik.uni-goettingen.de> wrote:

> > but if I try to do both, I get the diagonal instead
> >
> > >>> a[[1,2],[1,2]]
> > array([22, 33])
> >
> a[1:3,1:3]?
>
> Can’t be generalised to arbitrary selections of rows,columns, though (e.g.
> a[1::2,::2] still works…)
>

I am interested in the arbitrary selection of rows and columns given by
indices or by boolean selectors.
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