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Re: [Bug-apl] 0⍟0

From: Jay Foad
Subject: Re: [Bug-apl] 0⍟0
Date: Wed, 13 Jul 2016 12:05:24 +0100

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.


On 13 July 2016 at 11:04, Juergen Sauermann <address@hidden> 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:



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