[R] precision problem

[Roger Bivand]

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