Hi all... I¹m making a chart dealing with frequencies of isotopes of various elements. For instance, I'd like the following text to appear on a chart with the "35" and "37" as superscripts:
Based upon: 35Cl: 75% 37Cl: 25% I am having problems properly parsing the superscript that preceeds the "Cl", since there is no character ahead of the superscript (I saw examples in the archives where there was a preceeding character). Also, the construction of the string seems to not be working as I expect either. So, I think there are two problems here. Here is a sample of what doesn't quite work: Cl1 <- rbinom(1000, size = 1, prob = 0.25) pCl1 <- histogram(Cl1, main = expression(Cl[1]), xlab = "", ylab = "", scales = list(draw = FALSE), ylim = c(0:80)) plot(pCl1) # This works fine but doesn't have everything I want: leg.txt1 <- paste("Based upon:\n", ": 75%\n", ": 25%", sep = "") grid.text(leg.txt1, 0.5, 0.5) # This paste doesn't work due to the expression statements: leg.txt2 <- paste("Based upon:\n", expression(^35*Cl), ": 75%\n", expression(^37*Cl), ": 25%", sep = "") # This doesnt' produce an error, but doesn't produce what is wanted either, # as the expression is taken (almost) literally: leg.txt3 <- paste("Based upon:\n", expression(""^35*Cl), ": 75%\n", expression(""^37*Cl), ": 25%", sep = "") grid.text(leg.txt3, 0.5, 0.3) >From watching the help list, I know parsing things can be tricky. TIA, Bryan > sessionInfo() R version 2.7.1 (2008-06-23) i386-apple-darwin8.10.1 locale: en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8 attached base packages: [1] datasets grid grDevices graphics stats utils methods [8] base other attached packages: [1] fastICA_1.1-9 DescribeDisplay_0.1.3 ggplot_0.4.2 [4] RColorBrewer_1.0-2 reshape_0.8.0 MASS_7.2-42 [7] pcaPP_1.5 mvtnorm_0.9-0 hints_1.0.1-1 [10] mvoutlier_1.3 robustbase_0.2-8 lattice_0.17-8 [13] rggobi_2.1.9 RGtk2_2.12.5-3 ______________________________________________ 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.