[EMAIL PROTECTED] wrote:
> Full_Name: Dong-Yun Kim
> Version: 1.7.0/1.8.1
> OS: WinMe/WinXP
> Submission from: (NULL) (4.33.147.192)
>
>
> Hi all,
>
> It appears that R has a problem with evaluating logical "==" operator. The
> following are a few examples I found:
>
>
>>2.1+0.2==2.3
>
> [1] FALSE
>
>>2.7+0.1==2.8
>
> [1] FALSE
>
>>2.7+0.2==2.9
>
> [1] FALSE
>
>>3.1+0.2==3.3
>
> [1] FALSE
>
> Thanks.
>
> Dong-Yun Kim
>
> ______________________________________________
> [EMAIL PROTECTED] mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-devel
Not a bug!
These are (expected!) numerical issues of the representation of those
values. Please read help("==") which tells you:
"For numerical values, remember == and != do not allow for the finite
representation of fractions, nor for rounding error. Using all.equal
with identical is almost always preferable."
And ?all.equal and ?identical tell you to use:
identical(all.equal(2.7 + 0.1, 2.8), TRUE)
Uwe Ligges
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