On Sun, Jul 3, 2022 at 4:44 AM Elijah Stone <elro...@elronnd.net> wrote:
> As far as I know, no apl used suffix rules for conformability.  Two arrays of
> like shape were conformable, and a scalar is conformable with anything; but no
> two arrays are conformable aside from that.  An early version of j did use
> suffix conformability, and then switched.

APL used suffix indexing (of dimensions) for what I guess we might
call its bracket indexing "rank operator" (the precursor to J's rank
conjunction).

-- 
Raul
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