| From: | Michael Paquier <michael(dot)paquier(at)gmail(dot)com> |
|---|---|
| To: | Piotr Stefaniak <postgres(at)piotr-stefaniak(dot)me> |
| Cc: | Noah Misch <noah(at)leadboat(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com>, Peter Eisentraut <peter_e(at)gmx(dot)net>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Proposal: Trigonometric functions in degrees |
| Date: | 2016-01-31 12:23:38 |
| Message-ID: | CAB7nPqQuPbqPu74QbZ9ohn207sJqbR92yZzbeuzVo74KExqQYA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Sun, Jan 31, 2016 at 9:01 PM, Piotr Stefaniak
<postgres(at)piotr-stefaniak(dot)me> wrote:
> - result = sign * cosd_q1(arg1) / sind_q1(arg1);
> + result = sign * ((cosd_q1(arg1) / sind_q1(arg1)) / cot_45);
>
> and
>
> - result = sign * sind_q1(arg1) / cosd_q1(arg1);
> + result = sign * ((sind_q1(arg1) / cosd_q1(arg1)) / tan_45);
>
> both introduce division by zero, don't they?
Per IEEE 754, division by 0 for a double results in Nan or +/-Inf, so
that's actually correct.
--
Michael
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