| From: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
|---|---|
| To: | Juan José Santamaría Flecha <juanjo(dot)santamaria(at)gmail(dot)com> |
| Cc: | Bruce Momjian <bruce(at)momjian(dot)us>, Ashutosh Bapat <ashutosh(dot)bapat(at)2ndquadrant(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: factorial of negative numbers |
| Date: | 2020-06-16 09:49:59 |
| Message-ID: | CAEZATCVyX+QtVMLKrktwrbtbRRR70n6-Bt5QXh+g8fiGE9n3hQ@mail.gmail.com |
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On Tue, 16 Jun 2020 at 10:09, Juan José Santamaría Flecha
<juanjo(dot)santamaria(at)gmail(dot)com> wrote:
>
> It is defined as NaN (or undefined), which is not in the realm of integer numbers. You might get a clear idea of the logic from [1], where they also make a case for the error being ERRCODE_DIVISION_BY_ZERO.
>
> [1] http://mathforum.org/library/drmath/view/60851.html
>
Hmm, I think ERRCODE_DIVISION_BY_ZERO should probably be reserved for
actual division functions.
With [1], we could return 'Infinity', which would be more correct from
a mathematical point of view, and might be preferable to erroring-out
in some contexts.
[1] https://www.postgresql.org/message-id/606717.1591924582%40sss.pgh.pa.us
Regards,
Dean
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