Re: atan2 documentation bugs for 7.3 and 7.2
От | Bruce Momjian |
---|---|
Тема | Re: atan2 documentation bugs for 7.3 and 7.2 |
Дата | |
Msg-id | 200209110256.g8B2uNl04163@candle.pha.pa.us обсуждение исходный текст |
Ответ на | atan2 documentation bugs for 7.3 and 7.2 (Bruno Wolff III <bruno@wolff.to>) |
Список | pgsql-bugs |
OK, patch applied. --------------------------------------------------------------------------- Bruno Wolff III wrote: > 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. > > ---------------------------(end of broadcast)--------------------------- > TIP 4: Don't 'kill -9' the postmaster > -- Bruce Momjian | http://candle.pha.pa.us pgman@candle.pha.pa.us | (610) 359-1001 + If your life is a hard drive, | 13 Roberts Road + Christ can be your backup. | Newtown Square, Pennsylvania 19073 Index: func.sgml =================================================================== RCS file: /cvsroot/pgsql-server/doc/src/sgml/func.sgml,v retrieving revision 1.120 diff -c -r1.120 func.sgml *** func.sgml 2 Sep 2002 05:53:23 -0000 1.120 --- func.sgml 11 Sep 2002 02:54:46 -0000 *************** *** 743,749 **** <entry><function>atan2</function>(<replaceable>x</replaceable>, <replaceable>y</replaceable>)</entry> <entry>inverse tangent of ! <replaceable>a</replaceable>/<replaceable>x</replaceable></entry> </row> <row> --- 743,749 ---- <entry><function>atan2</function>(<replaceable>x</replaceable>, <replaceable>y</replaceable>)</entry> <entry>inverse tangent of ! <replaceable>x</replaceable>/<replaceable>y</replaceable></entry> </row> <row>
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