Re: [R] precision problem

From: Uwe Ligges <ligges_at_statistik.uni-dortmund.de>
Date: Thu 26 May 2005 - 00:18:56 EST

Omar Lakkis wrote:

> 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?

The R FAQ "Why doesn't R think these numbers are equal?" points you to ?all.equal

Uwe Ligges

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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Thu May 26 00:37:08 2005

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