Hello Greg, Session info is below. Running Win7 64-bit. I just upgraded my version of R and tried rerunning the code and got the same odd result. I, too, get an expected result when I create the plot in the R GUI. The problem crops up only when I try and create the plot in png() or tiff(). Perhaps I need to try par(new=T), or some other trick-of-the-trade? If you're unable to recreate the problem, I suppose this is nearly a dead-end?
sessionInfo() R version 2.13.2 (2011-09-30) Platform: x86_64-pc-mingw32/x64 (64-bit) locale: [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252 [3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C [5] LC_TIME=English_United States.1252 attached base packages: [1] splines stats graphics grDevices utils datasets methods base other attached packages: [1] TeachingDemos_2.7 Hmisc_3.8-3 survival_2.36-9 loaded via a namespace (and not attached): [1] cluster_1.14.0 grid_2.13.2 lattice_0.19-33 tools_2.13.2 -- View this message in context: http://r.789695.n4.nabble.com/subplot-strange-behavoir-tp3875917p3876178.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.