Re: [Bug-apl] Power Operator

[Juergen Sauermann]

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