Date: Sat, 7 Sep 2002 14:19:41 -0500
From: Bruno Wolff III <bruno@wolff.to>
To: pgsql-docs@postgresql.org
Subject: atan2 documentation bugs for 7.3 and 7.2
Message-ID: <20020907191941.GA30941@wolff.to>
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I think that I reported this to the wrong place. I seem to remember now
that documentation problems should go to the docs list.

----- Forwarded message from Bruno Wolff III <bruno@wolff.to> -----

Date: Thu, 5 Sep 2002 23:59:48 -0500
From: Bruno Wolff III <bruno@wolff.to>
To: pgsql-bugs@postgresql.org
Subject: atan2 documentation bugs for 7.3 and 7.2
Mail-Followup-To: pgsql-bugs@postgresql.org
User-Agent: Mutt/1.3.25i

In the section on mathematical functions the following is given for atan2:
atan2(x, y) inverse tangent of a/x

I believe the correct version should either be:
atan2(y, x) inverse tangent of y/x
or
atan2(x, y) inverse tangent of x/y

I beleive the documentation was also wrong for 7.2 where it was:
atan2(x, y) inverse tangent of y/x

The postgres functions seems to be the same as glibc function of the same
name when has the following man information:
       double atan2(double y, double x);

DESCRIPTION
       The atan2() function calculates the arc tangent of the two
       variables x and y.  It is similar to calculating  the  arc
       tangent  of y / x, except that the signs of both arguments
       are used to determine the quadrant of the result.

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TIP 4: Don't 'kill -9' the postmaster

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