| From: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
|---|---|
| To: | Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com> |
| Cc: | Juan José Santamaría Flecha <juanjo(dot)santamaria(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Ashutosh Bapat <ashutosh(dot)bapat(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: factorial of negative numbers |
| Date: | 2020-06-16 12:17:59 |
| Message-ID: | CAEZATCU3REOyN4OE1F4UWOEMj2ePNo9QR8a_tBf2V2j3sk8+ew@mail.gmail.com |
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On Tue, 16 Jun 2020 at 12:18, Peter Eisentraut
<peter(dot)eisentraut(at)2ndquadrant(dot)com> wrote:
>
> On 2020-06-16 11:49, Dean Rasheed wrote:
> > 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.
>
> But the limit of the gamma function is either negative or positive
> infinity, depending on from what side you come, so we can't just return
> one of those two.
>
Hmm yeah, although that's only really the case if you define it in
terms of continuous real input values.
I think you're probably right though. Raising an out-of-range error
seems like the best option.
Regards,
Dean
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