Re: [Bug-apl] 0⍟0

[Juergen Sauermann]

Hi Jay, I see. Which leaves the question if "equal" shall be strict or within ⎕IO. Since we are dealing with real numbers (and therefore often rounding errors) within ⎕IO makes more sense to me but the standard does not mention ⎕IO for ⍟. /// Jürgen On 07/13/2016 01:05 PM, Jay Foad wrote: My ISO ("First edition 2001-02-01") says: Evaluation Sequence:   If either of A or B are not numbers signal domain-error.   If A and B are equal, return one.   If A is one, signal domain-error.   Set A1 to the natural-logarithm of A.   Set B1 to the natural-logarithm of B.   Return B1 divided-by A1. 0⍟0 falls into the "A and B are equal" case. Jay. On 13 July 2016 at 11:04, Juergen Sauermann <juergen.sauerm...@t-online.de> wrote: Hi Kacper, my ISO (June 9, 2000) says DOMAIN ERROR. More precisely, they say that A⍟B is (⍟A)÷(⍟B) and then that ⍟0 gives DOMAIN ERROR. /// Jürgen On 07/12/2016 11:43 PM, Kacper Gutowski wrote: According to ISO, 0⍟0 should be one. GNU APL gives: 0⍟0 DOMAIN ERROR 0⍟0 ^^ -k