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,
hud...@hudsonlacerda.com wrote:
Hi. I get "SYNTAX ERROR" messages for /⍨ or ⌿⍨ :/⍨⍳3 ⌿⍨⍳3 Regards, Hudson
