May be this problem is OS specific (mac OS or windows...) i use ubuntu and have no problem with this function R> packageVersion("base") [1] ‘2.12.1’ R> packageVersion('lme4') [1] ‘0.999375.37’ R> sessionInfo() R version 2.12.1 (2010-12-16) Platform: x86_64-pc-linux-gnu (64-bit)
locale: [1] LC_CTYPE=fr_FR.UTF-8 LC_NUMERIC=C [3] LC_TIME=fr_FR.UTF-8 LC_COLLATE=fr_FR.UTF-8 [5] LC_MONETARY=C LC_MESSAGES=fr_FR.UTF-8 [7] LC_PAPER=fr_FR.UTF-8 LC_NAME=C [9] LC_ADDRESS=C LC_TELEPHONE=C [11] LC_MEASUREMENT=fr_FR.UTF-8 LC_IDENTIFICATION=C attached base packages: [1] grid stats graphics grDevices utils datasets [7] methods base other attached packages: [1] ggplot2_0.8.9 proto_0.3-8 stringr_0.4 reshape_0.8.3 [5] plyr_1.4 MASS_7.3-9 loaded via a namespace (and not attached): [1] tools_2.12.1 -- View this message in context: http://r.789695.n4.nabble.com/possible-bug-in-packageVersion-tp3242933p3243392.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.