postgres

History

Peter Eisentraut 74618e2b82 Another round of those unportable config/build changes :-/ * Add option to build with OpenSSL out of the box. Fix thusly exposed bit rot. Although it compiles now, getting this to do something useful is left as an exercise. * Fix Kerberos options to defer checking for required libraries until all the other libraries are checked for. * Change default odbcinst.ini and krb5.srvtab path to PREFIX/etc. * Install work around for Autoconf's install-sh relative path anomaly. Get rid of old INSTL__OPTS variables, now that we don't need them anymore. Use `gunzip -c' instead of g?zcat. Reportedly broke on AIX. * Look for only one of readline.h or readline/readline.h, not both. * Make check for PS_STRINGS cacheable. Don't test for the header files separately. * Disable fcntl(F_SETLK) test on Linux. * Substitute the standard GCC warnings set into CFLAGS in configure, don't add it on in Makefile.global. * Sweep through contrib tree to teach makefiles standard semantics. ... and in completely unrelated news: * Make postmaster.opts arbitrary options-aware. I still think we need to save the environment as well.		26 years ago
..
Makefile	Another round of those unportable config/build changes :-/	26 years ago
README.statmath	New contrib module for statistical mathematics	26 years ago
statmath.c	Added CVS header	26 years ago
statmath.sql.in	New contrib module for statistical mathematics	26 years ago

README.statmath

Statistical aggregate functions for PostgreSQL.

This module provides some aggregate functions for statistical 
mathematics. A new datatype holding two double precision 
floating point values is required by them. 

The aggregates are:

average(float8)         average value computed by

                                   n
                                  ___
                        _    1    \
                        x = ---    >  x
                             n    /__  i
                                  i=1


variance(float8         variance computed by

                                    n
                                   ___
                         2    1    \         _ 2
                        s  = ---    >  (x  - x) 
                             n-1   /__   i
                                   i=1



stddev(float8)          standard deviation computed by

                                 _____
                                /  2 
                        s =    /  s
                             \/


-- 
Jan Wieck <JanWieck@Yahoo.com>