| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Bruno Wolff III <bruno(at)wolff(dot)to> |
| Cc: | a(dot)maclean(at)cas(dot)edu(dot)au, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: Documentation fix regarding atan2 |
| Date: | 2007-09-05 03:25:23 |
| Message-ID: | 27516.1188962723@sss.pgh.pa.us |
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| Lists: | pgsql-general |
Bruno Wolff III <bruno(at)wolff(dot)to> writes:
> Andrew Maclean <andrew(dot)amaclean(at)gmail(dot)com> wrote:
>> In Table 9.4 of the documentation atan2 is described as follows:
>> atan2(*x*, *y*) inverse tangent of *x*/*y*
>>
>> I am sure it should read as:
>> atan2(*y*, x) inverse tangent of y/x
> Aren't those two statements sayiong the same thing?
They're logically equivalent but I think Andrew is right that y/x
corresponds to the usual interpretation of X and Y directions in
trigonometry.
regards, tom lane
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