Added in *SVN 1846*.
Best Regards,
Jürgen
On 2/22/25 03:50, Russtopia wrote:
Through random wanderings watching videos on APL and J, I encountered
a short segment on J's definition of the 'nub sieve' function (~:)
https://aplwiki.com/wiki/Nub_Sieve
In J (and, according to the "APL wiki" which I presume is for other
APL variants, https://aplwiki.com/wiki/Nub_Sieve) this is shorthand for
⎕cr 'Q'
┌→──────────────┐
↓λ←λ1 ⍵ │
│λ←((⍵⍳⍵)=⍳⍴⍵)/⍵│
└───────────────┘
Apparently GNU APL currently has no binding for monadic ≠. I presume
this is because it wasn't historically part of standard APL/2 syntax.
However, if the monadic use of ≠ is 'free', would there be a good
reason *not* to define it as such (ie., are there other contexts which
would break due to a monadic form being defined)?
This use is admittedly trivial and merely a convenience if it were
implemented; but would it enable other more succinct phrases without
violating APL/2 compatibility or have other useful applications if
defined natively?
-Russ
