Re: /⍨

[Dr . Jürgen Sauermann]

    Hi Hudson,
      
      thanks for reporting your issues. I believe that I fixed (most of)
      them in SVN 1556.
    
      Regarding the ISO PDF file, it is mentioned below the link in
      README-7-more-info
      that the file needs to be unzipped.
      
      Regarding ⌹{⍺+÷⍵}⍣1000⍨ 1 this works just fine on my
      machine:
      
            ⌹{⍺+÷⍵}⍣1000⍨ 1
        0.6180339887
        
      If you can reproduce the fault, then please check with gdb
      (after make apl.lines
      in directory src as to get better line numbers in gdb).
    
    Best Regards,
    Jürgen

On 6/1/22 2:08 AM, hudson@hudsonlacerda.com wrote:

> Hi Jürgen,
>
> There are some APL implementations that accept the form /⍨ .
> The GNU APL info manual had a section about the ambiguity of /⌿\⍀ , now removed, it seems.
>
> I collected some other issues I have with GNU APL (exceptions caused by user errors and more).
> See attachments. If you cannot replicate the exceptions, please tell me how to try inspect them.
>
> Thanks,
> Hudson
>
>
> ----- Em 31 de Maio de 2022, em 17:02, Dr. Jürgen Sauermann mail@jürgen-sauermann.de escreveu:
>
> > Hi Hudson,
> >
> > I checked with IBM APL2.
> >
> > Unfortunately my IBM APL2 has no ⍨ (aka. duplicate) operator.
> > But we can emulate it easily:
> >
> > DUP ←{ ⍵ ⍶ ⍵ }
> > + DUP 1 2 3
> > 2 4 6
> > × DUP 1 2 3
> > 1 4 9
> >
> > In GNU APL, DUP gives the same result as ⍨:
> >
> > /⍨1 2 3
> > SYNTAX ERROR
> > /⍨1 2 3
> > ^^
> >
> > /DUP 1 2 3
> > SYNTAX ERROR
> > /DUP 1 2 3
> > ^^
> >
> > However, in IBM APL2 I get the same (see attached screenshot),
> >
> > The problem seems to be caused by the ambiguity of / and friends (i.e. ⌿, \, and
> > ⍀ ).
> > You can work around this with a wrapper around /:
> >
> > REPL←{ ⍺ / ⍵ } ⍝ disambiguates / to mean replicate and not reduce
> > 3 REPL 1 2 3
> > 1 1 1 2 2 2 3 3 3
> >
> > REPL ⍨ 1 2 3
> > 1 2 2 3 3 3
> >
> > 1 2 3 REPL 1 2 3 ⍝ same as REPL ⍨ 1 2 3
> > 1 2 2 3 3 3
> >
> > Best Regards,
> > Jürgen
> >
> > On 5/31/22 2:18 AM, [ mailto:hudson@hudsonlacerda.com | hudson@hudsonlacerda.com
> > ] wrote:
> >
> > > Hi.
> > >         
> > > I get "SYNTAX ERROR" messages for /⍨ or ⌿⍨ :
> > >         
> > > /⍨⍳3
> > > ⌿⍨⍳3
> > >         
> > > Regards,
> > > Hudson
> > >         
> >       
>