Re: [Bug-apl] Operator Idiosyncrasies

[Mike Duvos]

Hi Jürgen,

> Interestingly, my APL2 reports DOMAIN ERROR on 0 +/ 99

Odd.  You should mention that in the APL2 forum.  Perhaps you need a later service level.

There's still one minor inconsistency between APL2 and GNU APL on that _expression_.  ≡ reports a depth of 4 for the result in APL2 and a depth of 3 in GNU APL.  I have no idea why.  APL2 appears to be doing an extra enclose on the elements of the array.

In my APL2, enclose of a simple scalar (a single character or number), is a no-op.  However, enclosed arrays are not simple scalars and can be enclosed again, increasing their depth by one.

This is different from GNU APL, which appears to no-op all encloses of scalars.

[IBM APL2]

      ≡⊂⊂⊂⊂⊂,8
6

[GNU APL]

      ≡⊂⊂⊂⊂⊂,8
2

Which one of these is "right" is a philosophical question.

Regards,

Mike