Re: [R] Is this correct?

From: ecatchpole <e.catchpole_at_adfa.edu.au>
Date: Tue 11 Oct 2005 - 15:57:58 EST

See the R FAQ list, section 7. Why doesn't R think these numbers are equal?

Ted.

On 11/10/05 15:42, Joe wrote,:
> Dear userR,
>
> With the following results, are they correct or acceptable?
>

>>x <- c(1.4, 1.2, 2.8)
>>sum(x)

> [1] 5.4
>>sum(x) == 5.4

> [1] FALSE
>>(1.4 + 1.2 + 2.8) - 5.4

> [1] -8.881784e-16
>>(1.4 + 1.2) - 2.6

> [1] -4.440892e-16
>>2.6 - 1.5 - 1.1

> [1] 0
>
>>version

> _
> platform i386-pc-mingw32
> arch i386
> os mingw32
> system i386, mingw32
> status
> major 2
> minor 2.0
> year 2005
> month 10
> day 06
> svn rev 35749
> language R
>
> What can I do to correct them if they are not correct?
> Thanks!
> --
> C. Joseph Lu
> Department of Statistics
> National Cheng-Kung University
> Tainan, Taiwan, ROC
>
> ______________________________________________
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-- 
Dr E.A. Catchpole
Visiting Fellow
Univ of New South Wales at ADFA, Canberra, Australia
and University of Kent, Canterbury, England
- www.ma.adfa.edu.au/~eac
- fax: +61 2 6268 8786		
- ph:  +61 2 6268 8895

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Received on Tue Oct 11 16:02:16 2005

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