On 9/15/07, Bruce Momjian <bruce@xxxxxxxxxx> wrote:
Change made. Thanks. Your documentation changes can be viewed in five
minutes using links on the developer's page,
http://www.postgresql.org/developer/testing.
---------------------------------------------------------------------------
Andrew Maclean 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
>
> This looks to be the standard C++/c atan2(y,x) function.
>
> You can easily test this:
> If y = 2, x = 1, then degrees(atan(y/x)) =63.4 but if we proceed according
> to the documentation; degrees(atan2(x,y))=degrees(atan2(1,2))= 25.6 which is
> not the same as degrees(atan(y/x)).
> So it must be degrees(atan2(y,x))=degrees(atan2(2,1))=63.4.
>
>
> Thanks
> Andrew
>
> --
> ___________________________________________
> Andrew J. P. Maclean
> Centre for Autonomous Systems
> The Rose Street Building J04
> The University of Sydney 2006 NSW
> AUSTRALIA
> Ph: +61 2 9351 3283
> Fax: +61 2 9351 7474
> URL: http://www.acfr.usyd.edu.au/
> ___________________________________________
--
Bruce Momjian <bruce@xxxxxxxxxx > http://momjian.us
EnterpriseDB http://www.enterprisedb.com
+ If your life is a hard drive, Christ can be your backup. +
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___________________________________________
Andrew J. P. Maclean
Centre for Autonomous Systems
The Rose Street Building J04
The University of Sydney 2006 NSW
AUSTRALIA
Ph: +61 2 9351 3283
Fax: +61 2 9351 7474
URL: http://www.acfr.usyd.edu.au/
___________________________________________
