Hi Kacper,
I believe the VALENCE ERROR comes because = is dyadic and
the lambda is monadic?
In GNU APL (and in the ISO standard) there is no monadic =, is it?
Maybe in Dyalog APL there is?
/// Jürgen
On 08/13/2014 06:40 PM, Kacper Gutowski wrote:
That's interesting thing to see in GNU APL.
Negative exponents are obviously tricky to do, but what about using
boolean functions? It's a quite convenient way to succinctly express
iteration. But right now GNU APL gives somewhat unexpected results:
({2+⍵÷2}⍣≡) 9
9
({2+⍵÷2}⍣=) 9
VALENCE ERROR
(λ1⍣=)9
^ ^
In both cases Dyalog's answer would be 4, i.e. a fixed point of {2+⍵÷2}.
-k
