On Wed, Dec 23, 2020 at 10:46:13PM -0800, Russtopia wrote:
[Dyalog]
9 2 9/↑'∘⌹∘' ' ⌹ '
∘∘∘∘∘∘∘∘∘⌹⌹∘∘∘∘∘∘∘∘∘
⌹⌹
[GNU]
9 2 9/↑'∘⌹∘' ' ⌹ '
∘∘∘∘∘∘∘∘∘⌹⌹∘∘∘∘∘∘∘∘∘
Is it unexpected that GNU APL does not apply the Compress (/) across
multiple right-hand items?
There are some subtle differences in how / works in Dyalog and in GNU APL,
but here the reason is much more prosaic.
By default the monadic ↑ and ⊃ are swapped in Dyalog. It has a setting
called ⎕ML that controls it, and if you set ⎕ML←2, it will interpret
this expression the same way GNU APL does:
9 2 9/⊃'∘⌹∘' ' ⌹ '
∘∘∘∘∘∘∘∘∘⌹⌹∘∘∘∘∘∘∘∘∘
⌹⌹
-k
