This is *not* "rounding down." But this should do it I think: ## (see ?floor)
x <- 3.896e09 k <- floor(log10(x)) > floor(x*10^(-k))*10^k [1] 3e+09 There may be even slicker ways, but this is as slick as I can muster... Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Tue, Sep 4, 2018 at 9:33 AM Nelly Reduan <nell.r...@hotmail.fr> wrote: > Hello, > > > > How can I round down numeric values with decimals? For example, > > > > > signif(3.896037e+09, digits = 1) > > [1] 4e+09 > > > > The expected result is 3e+09 (and not 4e+09). > > > > > signif(8.68542378e-10, digits = 1) > > [1] 9e-10 > > > > The expected result is 8e-10 (and not 9e-10). > > > > Thank you very much for your time. > > Have a nice day > > Nell > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > 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. > [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
