On Fri, Mar 18, 2016 at 06:12:12PM -0700, Jeff Janes wrote: > On Tue, Mar 15, 2016 at 8:36 AM, David Fetter <da...@fetter.org> wrote: > > > > Please find attached a patch that uses the float8 version to cover the > > numeric types. > > Is there a well-defined meaning for having a negative weight? If no, > should it be disallowed?
Done. > Shouldn't these then give the same result: > > select stddev_samp(val) from foo; > stddev_samp > ------------------- > 2887.054977297105 > > select weighted_stddev_samp(val,count) from foo2; > weighted_stddev_samp > ---------------------- > 2887.19919651336 > > The 5th digit seems too early to be seeing round-off error. Fixed down-thread. Cheers, David. -- David Fetter <da...@fetter.org> http://fetter.org/ Phone: +1 415 235 3778 AIM: dfetter666 Yahoo!: dfetter Skype: davidfetter XMPP: david.fet...@gmail.com Remember to vote! Consider donating to Postgres: http://www.postgresql.org/about/donate -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
