Message-ID: <Pine.LNX.4.44.0505251621170.7757-100000@reclus.nhh.no>
Date: 2005-05-25T14:21:34Z
From: Roger Bivand
Subject: precision problem
In-Reply-To: <3f87cc6d05052507083041d095@mail.gmail.com>
On Wed, 25 May 2005, Omar Lakkis wrote:
?all.equal, I think
> I have prices that I am finding difficult to compare with ==, > and >,
> due to precision. For example: the numbers should match, with '==',
> but they differ in the magnitude of 1e-14 due to bunch of calculations
> that I run on them. Programming with java, I am used to implementing a
> function that compares the difference between the numbers to a pre
> determined precision factor. This could be very slow when I have two
> matrices of numbers that I could otherwise compare with a simple '==',
> '>' or '<' in R.
> What is teh best solution for this problem?
> Can I control the precision of ==, > and < without having to
> reimplement the operations in a slow way?
>
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--
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no