Re: n-dim matrices

[Jeremy Howard]

I wrote:
> Karl Glazebrook wrote:
> > for a slice we want
> >
> > $a[10:20:2, 11:30:3]
> >
> As opposed to:
>
>   $a[[10:20:2], [11:30:3]]
>
Sorry--I need to correct this. The correct syntax for a list slice under my
proposal would actually be:

  @a[10:20:2][11:30:3]

It needs the '@' of course since it's returning an array, and it needs to
use the standard LOL notation with the extension to multiple elements. OTOH:

  @a[[10:20:2], [11:30:3]]

would actually just return the 2 points at (10,12,14,16,18,20) and
(11,14,17,20,23,36,29).