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How to Make aggragate Function? Standard Deviation?

From: "Phillip J(dot) Allen" <paallen(at)attglobal(dot)net>
To: PGSQL-NOVICE(at)POSTGRESQL(dot)ORG
Subject: How to Make aggragate Function? Standard Deviation?
Date: 2001-08-15 15:51:36
Message-ID: 3B7A9A88.2FFEE5C0@attglobal.net (view raw or flat)
Thread:
Lists: pgsql-novice
Hi all,

I am just starting to write functions in plpgsql.  I have made some
simple functions but now I need a standard deviation function.  The
documentation was not too clear so does anyone have any suggestion on
how to begin?  I can do this in plpgsql or do I need to do this in C?

thanks,

Phillip J. Allen
Consulting Geochemist/Geologist
Lima Peru
e-mail: paallen(at)attglobal(dot)ent


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