Re: [Bug-apl] an other inner product ,., bug

[Juergen Sauermann]

Hi Jay, I believe that when they wrote the ISO standard they were still used to the old APL, where f and g had to be scalar functions and then f/A g B of two vectors would anyhow be a scalar, and therefore they simply forgot to enclose the result of f/A g B. /// Jürgen On 05/21/2018 12:27 PM, Jay Foad wrote: 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

signature.asc
Description: OpenPGP digital signature