[R] Bug or just a problem with the computer precision?

[jim holtman]

You are getting round-off problems (I think it is FAQ 7.33).  Use
characters since thats what the numbers really are. Convert the
characters and then use substring.  Also sprintf works:

> sprintf("%.2f", A*100)
[1] "470990.00"
> sprintf("%.2f", A)
[1] "4709.90"
>


On 10/4/07, Renger van Nieuwkoop <renger at ecoplan.ch> wrote:
> Hi
>
> I have the following problem: I have a lot of numbers that identify
> import goods according to the Harmonised System (8 numbers in two groups
> with a dot in between). I want to move to the
> 6 numbers (4 numbers, dot, two numbers). My trick to do this works for
> all the numbers in the Harmonised Sytem but not for this one:
>
> A<-4709.9000
> (A<-floor(100 * A ) / 100) = 4709.89
>
> But this has to be 4709.90
>
> If I do this in Excel it works fine...Any idea how to make sure that I
> get 4709.90 and not 4709.89?
>
> Renger
>
>
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?