[R] precision problem

Uwe Ligges ligges at statistik.uni-dortmund.de
Wed May 25 16:18:56 CEST 2005

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

Uwe Ligges

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