David, which graphics device and which OS are you talking about? For Quartz it is the Symbol font that is used (if I remember correctly) - please check your Font Book and make sure it's not disabled.
Cheers, Simon On Jun 15, 2010, at 5:17 PM, David Winsemius wrote: > Dear MacRs; > > I have been having this problem for a while, but thought that when I updated > to 2.11.1 that it might get fixed, but just did that and it persists. When I > use plotmath functions, I see little empty boxes where I should be seeing > theta's and phi's: > > require(graphics) # the first plotmath example > x <- seq(-4, 4, len = 101) > y <- cbind(sin(x), cos(x)) > matplot(x, y, type = "l", xaxt = "n", > main = expression(paste(plain(sin) * phi, " and ", > plain(cos) * phi)), > ylab = expression("sin" * phi, "cos" * phi), # only 1st is taken > xlab = expression(paste("Phase Angle ", phi)), > col.main = "blue") > axis(1, at = c(-pi, -pi/2, 0, pi/2, pi), > labels = expression(-pi, -pi/2, 0, pi/2, pi)) > # -- no phi's or pi's or warnings --- > > How do I identify which library should be replaced or repaired or added to my > PATH or which option set? > > Have searched archives and FAQs, but maybe I'm not using same terms or > understanding what I am being told. > > -- > > David Winsemius, MD > West Hartford, CT > > sessionInfo() > R version 2.11.1 Patched (2010-06-14 r52281) > x86_64-apple-darwin9.8.0 > > locale: > [1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8 > > attached base packages: > [1] stats graphics grDevices utils datasets methods base > > other attached packages: > [1] lattice_0.18-8 > > loaded via a namespace (and not attached): > [1] grid_2.11.1 tools_2.11.1 > > _______________________________________________ > R-SIG-Mac mailing list > R-SIG-Mac@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-mac > > _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-mac