If you followed this part of the ISO standard verbatim then: 2 3 +.⍴ 4 5 ←→ +/2 3 ⍴ 4 5 ←→ 13 14
GNU APL and APL2 actually return ⊂13 14 which seems more sensible. I am not sure why ISO has (or needs) that special case. It seems wrong to me. Jay. On 18 May 2018 at 16:03, Juergen Sauermann <juergen.sauerm...@t-online.de> wrote: > The ISO standard follows suit, except that it has a special case for A and > B being vectors: > > *"If A and B are both vectors, return f/A g B." *(ISO standard, page > 121 with A=A1 and B=B1). > > GNU APL follows the ISO standard >
