Hi all I have encountered some strange/wrong behavior of the round function in R.
This is the behavior on my mac laptop: > R.version _ platform x86_64-apple-darwin13.0.2 arch x86_64 os darwin13.0.2 system x86_64, darwin13.0.2 status major 3 minor 0.2 year 2013 month 09 day 25 svn rev 63987 language R version.string R version 3.0.2 (2013-09-25) nickname Frisbee Sailing > round(1.5) [1] 2 > round(4.5) [1] 4 > floor(1.5 + 0.5) [1] 2 > floor(4.5 + 0.5) [1] 5 This is the behavior on Ubuntu 12.04 running in a virtual machine on the same mac: > R.version _ platform x86_64-pc-linux-gnu arch x86_64 os linux-gnu system x86_64, linux-gnu status beta major 3 minor 1.0 year 2014 month 03 day 28 svn rev 65330 language R version.string R version 3.1.0 beta (2014-03-28 r65330) nickname Spring Dance > round(1.5) [1] 2 > round(4.5) [1] 4 > floor(1.5 + 0.5) [1] 2 > floor(4.5 + 0.5) [1] 5 I would expect round(x.5) = x+1, which only happens sometimes. My colleague using R version 3.1.0 on Linux on a Lenovo laptop gets the expected result in all cases. Is this a bug or somehow expected behavior? It seems to be related to the mac hardware. I can ad hoc fix it using floor, but that is hardly optimal. Thanks, Per [[alternative HTML version deleted]] _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-mac