From: Chris Travers <chris@travelamericas.com>
To: Yasir Malik <ymalik@heineken.cs.stevens-tech.edu>
To: PostgreSQL <pgsql-sql@postgresql.org>
Subject: Re: Anti log in PostgreSQL
Date: Sat, 27 Dec 2003 09:14:40 +0700
Message-ID: <000801c3cc61$1cdc75d0$93285e3d@winxp> (raw)
References: <3FECB238.1050801@sancharnet.in>
<200312261934.35070.martin@bugs.unl.edu.ar>
<Pine.LNX.4.58.0312261813480.26722@heineken.cs.stevens-tech.edu>
Definition of log (base n) is that log n(x) = y where n^y = x for all values
of x and y. n is the base.
So a base 10 log would be reversed by doing 10^x=y. If we know x, we use
the exponential operation; if we know y we use log(y) = x. For ln (natural
logs, base e, e is approx. 2.818), use e^x=y.
Hope this explains things.
Best Wishes,
Chris Travers
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To: pgsql-sql@postgresql.org
Cc: chris@travelamericas.com, ymalik@heineken.cs.stevens-tech.edu
Subject: Re: Anti log in PostgreSQL
In-Reply-To: <000801c3cc61$1cdc75d0$93285e3d@winxp>
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