Re: [R] help for the first poster- a simple question

From: jim holtman <jholtman_at_gmail.com>
Date: Mon, 03 Mar 2008 12:54:35 -0500

FAQ 7.31 (You need to understand what floating point numbers are)

On 3/3/08, Xuejun Qin <xjq_at_chg.duhs.duke.edu> wrote:
> Hi, there,
> I cannot get accurate value for calculation.
> for example:
> ld<-sqrt(1*0.05*0.95*0.05*0.95)
> 0.05*0.95-ld=-6.938894e-18
> 0.05*0.95-ld==0 is False.
>
> I met this problem in my program, how can I handle it. Thanks.
>
>
> xj.
>
> ______________________________________________
> R-help_at_r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?

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Received on Mon 03 Mar 2008 - 18:13:47 GMT

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