[Rd] Numerical error in R (win32) (PR#8909)

ligges at statistik.uni-dortmund.de
2006-05-29T16:44:31Z

teck.lim at imperial.ac.uk wrote:

> Hi
>     I had observed the following problem in R (also C, Matlab, and Python).
> sprintf('%1.2g\n', 3.15)
> give 3.1 instead of 3.2 whereas an input of 3.75 gives 3.8.
> Java's System.out.printf is ok though.
>
>
>>round(3.75,1)
>
> [1] 3.8
>
>>round(3.15,1)
>
> [1] 3.1
>
> Similar outcome with sprintf in R.
>
>
> However, the right answer should be 3.2

This is not a bug.

Please read the R FAQ "Why doesn't R think these numbers are
equal?" and
after that note that *numerically* the following inaqualities are TRUE:
(3.2 - 3.15) > 0.05
(3.15 - 3.1) < 0.05

Uwe Ligges


> Regards
> Teckpor
>
>
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