[Rd] rounding change

Hervé Pagès hp@ge@ @end|ng |rom |redhutch@org
Wed Mar 11 20:04:12 CET 2020

Thanks for the heads up. The new result for round(51/80, digits=3) is 
also consistent with sprintf("%.3f", 51/80), format(51/80, digits=3), 
print(51/80, digits=3), and with the sprintf() function in C. Which is 
somehow satisfying.


On 3/5/20 05:54, Therneau, Terry M., Ph.D. via R-devel wrote:
> This is a small heads up for package maintainers.   Under the more recent R-devel, R CMD
> check turned up some changes in the *.out files.   The simple demonstration is to type
> "round(51/80, 3)", which gives .638 under the old and .637 under the new.   (One of my
> coxph test cases has a concordance of exactly 51/80).
> In this particular case 51/80 is exactly .63750000, but that value does not have an exact
> representation in base 2.  The line below would argue that the new version is correct, at
> least with respect to the internal representation.
>   > print(51/80, digits = 20)
> [1] 0.63749999999999995559
> This is not a bug or problem, it just means that whichever version I put into my
> survival/tests/book6.Rout.save file, one of R-devel or R-current will flag an issue.
> 	[[alternative HTML version deleted]]
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Hervé Pagès

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