[R] precision problem

bogdan romocea br44114 at gmail.com
Wed May 25 16:21:43 CEST 2005

This is a FAQ, 7.31.

-----Original Message-----
From: Omar Lakkis [mailto:uofiowa at gmail.com]
Sent: Wednesday, May 25, 2005 10:09 AM
To: r-help at stat.math.ethz.ch
Subject: [R] precision problem

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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