Re: [Bug-apl] 0⍟0

[Jay Foad]

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 <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:

      0⍟0
DOMAIN ERROR
      0⍟0
      ^^

-k