Not weird at all!!! You need to understand how computers do arithmetic. See R FAQ 7.31. -- Bert
On Fri, Nov 12, 2010 at 10:55 AM, Vadim Patsalo <patsa...@gmail.com> wrote: > Hello R-help, > > I noticed the following surprising behavior when using %in% to find elements > in a vector generated using seq(). > > # weird!!! >> c(7.7, 7.8, 7.9) %in% seq(4, 8, by=0.1) > [1] TRUE FALSE TRUE > > # OK now >> c(7.7, 7.8, 7.9) %in% round(seq(4, 8, by=0.1), 1) > [1] TRUE TRUE TRUE > > # wait, how is this different? >> c(7.7, 7.8, 7.9) %in% seq(7, 8, by=0.1) > [1] TRUE TRUE TRUE > > Is there an obvious reason for this behavior which I am missing? Seems like a > bug to me... > > Thanks in advance! > Vadim > >> sessionInfo() > R version 2.12.0 (2010-10-15) > Platform: i386-apple-darwin9.8.0/i386 (32-bit) > > locale: > [1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8 > > attached base packages: > [1] graphics grDevices utils datasets stats methods base > > other attached packages: > [1] cluster_1.13.1 nlme_3.1-97 lattice_0.19-13 > > loaded via a namespace (and not attached): > [1] grid_2.12.0 > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > 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. > -- Bert Gunter Genentech Nonclinical Biostatistics ______________________________________________ R-help@r-project.org mailing list 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.