log1p(x), in the base package computes log(1+x) accurately for small x (and large).
E.g., > options(digits=16) > base::log1p(1e-14) [1] 9.99999999999995e-15 > base::log1p(1e-14) - base::log(1+1e-14) [1] 7.992778373591124e-18 > as.numeric(log(Rmpfr::mpfr(1,precBits=1000) + Rmpfr::mpfr(1e-14, precBits=1000))) - log1p(1e-14) [1] 0 Bill Dunlap TIBCO Software wdunlap tibco.com On Mon, Dec 12, 2016 at 8:23 AM, Faradj Koliev <farad...@gmail.com> wrote: > Hi all, > > How do I perform log(x+1) in R? > > log1p_trans() from the package ”scales" doesn’t seem to work for me. > > Best, > Faradj > ______________________________________________ > 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.
