8 ($@] #: [ I.@:= ,@]) A
1 3
   8 (4 $. $.@:= ) A
1 3

Note that both of these results are rank 2.

-- 
Raul

On Tue, Dec 26, 2023 at 8:32 PM David Pinchbeck <dpinc...@gmail.com> wrote:
>
> Having trouble finding this in the wiki:  I know that we can select from a
> table using a boxed pair
>
> A
>
> 0 1 2 3 4
>
> 5 6 7 8 9
>
> 10 11 12 13 14
>
> 15 16 17 18 19
>
> 20 21 22 23 24
>
>
> (<1 3){A
>
> 8
>
> How do I write a verb f to do the reverse, so that
> 8 f A
> yields the result 1 3  ?
>
> Thanks,
> David
> --
> David Pinchbeck
> Associate Professor of Mathematics
> St. Joseph's College
> Standish, ME
> ----------------------------------------------------------------------
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